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Showing 1 - 20 of 527 results

HBM Virtual Testing Framework Development and Demonstration

Hu, Jingwen ;

Lin, Chin-Hsu

2026-10-01 | PDF

This study's objectives were (1) to propose a virtual testing framework for evaluating vehicle occupant protection using human body models (HBMs), and (2) to perform an initial demonstration of that framework. Development focused on high-level steps, including HBM validation, vehicle model development and validation, crash simulation setup (HBM pos ...

10/19/2026

Title : HBM Virtual Testing Framework Development and Demonstration Creator(s) : Hu, Jingwen;Lin, Chin-Hsu;Boyle, Kyle J.; Corporate Creator(s) : University of Michigan Transportation Research Institute;General Motors Corporation; Corporate Contributor(s) : United States. Department of Transportation. National Highway Traffic Safety Administration. Office of Vehicle Safety Research Published Date : 2026-10-01 Report Number : DOT HS 813 838 DOI : https://doi.org/10.21949/hvfs-yf48
Hu, J., Lin, C. H., & Boyle, K. J. (2026). HBM Virtual Testing Framework Development and Demonstration (Report No. DOT HS 813 838). United States. Department of Transportation. National Highway Traffic Safety Administration. https://doi.org/10.21949/hvfs-yf48

Hu, Jingwen, Chin-Hsu Lin, and Kyle J. Boyle. HBM Virtual Testing Framework Development and Demonstration. Report no. DOT HS 813 838. United States. Department of Transportation. National Highway Traffic Safety Administration, 2026. https://doi.org/10.21949/hvfs-yf48.

Hu, Jingwen, et al. HBM Virtual Testing Framework Development and Demonstration. United States. Department of Transportation. National Highway Traffic Safety Administration, 2026, Report no. DOT HS 813 838, ROSA P. https://doi.org/10.21949/hvfs-yf48.
Export RIS Citation Information. TY - Tech Report AU - Hu, Jingwen AU - Lin, Chin-Hsu AU - Boyle, Kyle J. A2 - University of Michigan Transportation Research Institute A2 - General Motors Corporation A3 - United States. Department of Transportation. National Highway Traffic Safety Administration. Office of Vehicle Safety Research AB - This study's objectives were (1) to propose a virtual testing framework for evaluating vehicle occupant protection using human body models (HBMs), and (2) to perform an initial demonstration of that framework. Development focused on high-level steps, including HBM validation, vehicle model development and validation, crash simulation setup (HBM positioning, settling, and belt fitting), and injury assessment with potential weighting factors. The demonstration used 11 HBMs in seven sizes and shapes and four crash conditions, producing 28 crash simulations with the detailed vehicle model by GM and 35 simulations with the parametric vehicle model by UMTRI. Results showed generally consistent predictions for occupant kinematics and injury risks between the two vehicle-model approaches, with discrepancies in a few isolated cases. Despite differences in HBM geometry, settling method, and belt fitting approach, the two vehicle models produced similar overall weighted average injury risks. This study highlights the potential of the HBM virtual testing framework for occupant protection assessment while identifying limitations and areas for future improvement. AN - dot:94054 DA - 2026-10-01 DO - https://doi.org/10.21949/hvfs-yf48 KW - Anthropometry KW - Simulation KW - Test procedures KW - Parametric analysis KW - Control systems KW - Crash victim simulation KW - Dummies KW - Crash injury research KW - Human body model (HBM) KW - Virtual testing framework KW - Parametric vehicle model KW - Global Human Body Models Consortium {GHBMC} LA - English PB - United States. Department of Transportation. National Highway Traffic Safety Administration PY - 2026 SN - DOT HS 813 838 TI - HBM Virtual Testing Framework Development and Demonstration M3 - Tech Report N1 - United States N1 - 693JJ921D000021/693JJ923F000182 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/94054 ER -
Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [Supporting Dataset 3 of 3]

Moorcroft, David M.

2026-09-30 | JSON

This dataset contains simulation input and output representing sled tests. These data are created by computer simulations. The simulations were run in 2026. It is anticipated that aircraft seat manufacturers and test laboratories will benefit from access to this data as they design and test real aircraft seats and restraints. This dataset will also ...

10/19/2026

Supporting Files

Title : Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [Supporting Dataset 3 of 3] Creator(s) : Moorcroft, David M. Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration. Civil Aerospace Medical Institute Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Aircraft Certification Service Published Date : 2026-09-30 URL : https://rosap.ntl.bts.gov/view/dot/94053
Moorcroft, D. M. (2026). Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [Supporting Dataset 3 of 3]. United States. Department of Transportation. Federal Aviation Administration. Office of Aerospace Medicine. Civil Aerospace Medical Institute (CAMI). https://rosap.ntl.bts.gov/view/dot/94053

Moorcroft, David M.. Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [Supporting Dataset 3 of 3]. United States. Department of Transportation. Federal Aviation Administration. Office of Aerospace Medicine. Civil Aerospace Medical Institute (CAMI), 2026. https://rosap.ntl.bts.gov/view/dot/94053.

Moorcroft, David M. Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [Supporting Dataset 3 of 3]. United States. Department of Transportation. Federal Aviation Administration. Office of Aerospace Medicine. Civil Aerospace Medical Institute (CAMI), 2026, ROSA P. https://rosap.ntl.bts.gov/view/dot/94053.
Export RIS Citation Information. TY - Dataset AU - Moorcroft, David M. A2 - United States. Department of Transportation. Federal Aviation Administration. Civil Aerospace Medical Institute A3 - United States. Department of Transportation. Federal Aviation Administration. Aircraft Certification Service AB - This dataset contains simulation input and output representing sled tests. These data are created by computer simulations. The simulations were run in 2026. It is anticipated that aircraft seat manufacturers and test laboratories will benefit from access to this data as they design and test real aircraft seats and restraints. This dataset will also provide a public record to support potential rulemaking. AB - This item is made available under the terms of the Creative Commons Attribution 1.0 Universal (CC0 1.0) license https://creativecommons.org/publicdomain/zero/1.0/. Use the following citation: United States. Department of Transportation. Federal Aviation Administration. Office of Aviation. Office of Aerospace Medicine (2026). Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [supporting datasets]. https://doi.org/10.21949/1529736 AN - dot:94053 DA - 2026-09-30 ET - 3 of 3 dataset records KW - Parts of seats KW - Seats KW - Foams KW - Loads KW - Dynamic tests KW - Aircraft KW - Lumbar Load LA - English PB - United States. Department of Transportation. Federal Aviation Administration. Office of Aerospace Medicine. Civil Aerospace Medical Institute (CAMI) PY - 2026 TI - Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [Supporting Dataset 3 of 3] M3 - Dataset N1 - United States N1 - This item is made available under the terms of the Creative Commons Attribution 1.0 Universal (CC0 1.0) license https://creativecommons.org/publicdomain/zero/1.0/. Use the following citation: United States. Department of Transportation. Federal Aviation Administration. Office of Aviation. Office of Aerospace Medicine (2026). Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [supporting datasets]. https://doi.org/10.21949/1529736 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/94053 ER -
Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [Supporting Dataset 2 of 3]

Moorcroft, David M.

2026-09-30 | ZIP

This dataset contains simulation input and output representing sled tests. These data are created by computer simulations. The simulations were run in 2026. It is anticipated that aircraft seat manufacturers and test laboratories will benefit from access to this data as they design and test real aircraft seats and restraints. This dataset will also ...

10/19/2026

Title : Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [Supporting Dataset 2 of 3] Creator(s) : Moorcroft, David M. Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration. Civil Aerospace Medical Institute Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Aircraft Certification Service Published Date : 2026-09-30 URL : https://rosap.ntl.bts.gov/view/dot/94052
Moorcroft, D. M. (2026). Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [Supporting Dataset 2 of 3]. United States. Department of Transportation. Federal Aviation Administration. Office of Aerospace Medicine. Civil Aerospace Medical Institute (CAMI). https://rosap.ntl.bts.gov/view/dot/94052

Moorcroft, David M.. Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [Supporting Dataset 2 of 3]. United States. Department of Transportation. Federal Aviation Administration. Office of Aerospace Medicine. Civil Aerospace Medical Institute (CAMI), 2026. https://rosap.ntl.bts.gov/view/dot/94052.

Moorcroft, David M. Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [Supporting Dataset 2 of 3]. United States. Department of Transportation. Federal Aviation Administration. Office of Aerospace Medicine. Civil Aerospace Medical Institute (CAMI), 2026, ROSA P. https://rosap.ntl.bts.gov/view/dot/94052.
Export RIS Citation Information. TY - Dataset AU - Moorcroft, David M. A2 - United States. Department of Transportation. Federal Aviation Administration. Civil Aerospace Medical Institute A3 - United States. Department of Transportation. Federal Aviation Administration. Aircraft Certification Service AB - This dataset contains simulation input and output representing sled tests. These data are created by computer simulations. The simulations were run in 2026. It is anticipated that aircraft seat manufacturers and test laboratories will benefit from access to this data as they design and test real aircraft seats and restraints. This dataset will also provide a public record to support potential rulemaking. AB - This item is made available under the terms of the Creative Commons Attribution 1.0 Universal (CC0 1.0) license https://creativecommons.org/publicdomain/zero/1.0/. Use the following citation: United States. Department of Transportation. Federal Aviation Administration. Office of Aviation. Office of Aerospace Medicine (2026). Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [supporting datasets]. https://doi.org/10.21949/1529736 AN - dot:94052 DA - 2026-09-30 ET - Set 2 of 3 dataset records KW - Parts of seats KW - Seats KW - Foams KW - Loads KW - Dynamic tests KW - Aircraft KW - Lumbar Load LA - English PB - United States. Department of Transportation. Federal Aviation Administration. Office of Aerospace Medicine. Civil Aerospace Medical Institute (CAMI) PY - 2026 TI - Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [Supporting Dataset 2 of 3] M3 - Dataset N1 - United States N1 - This item is made available under the terms of the Creative Commons Attribution 1.0 Universal (CC0 1.0) license https://creativecommons.org/publicdomain/zero/1.0/. Use the following citation: United States. Department of Transportation. Federal Aviation Administration. Office of Aviation. Office of Aerospace Medicine (2026). Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [supporting datasets]. https://doi.org/10.21949/1529736 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/94052 ER -
Investigation of Speed Countermeasures for Arterial Streets

Fitzpatrick, Kay

;

Kockelman, Kara

2026-10-01 | PDF

Vehicle speed is among the key attributes that make a difference in the injury severity outcome of a crash. This project started by reviewing the literature and existing toolkits to identify countermeasures to manage vehicle speeds and to improve safety especially for vulnerable road users on arterial street. A companion document, Speed Countermeas ...

10/19/2026

Title : Investigation of Speed Countermeasures for Arterial Streets Creator(s) : Fitzpatrick, Kay;Kockelman, Kara;Kutela, Boniphace;Li, Keya; Corporate Creator(s) : Texas A&M Transportation Institute Corporate Contributor(s) : Texas Department of Transportation. Research and Technology Implementation Office;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-10-01 Report Number : FHWA/TX-27/0-7220-R1 URL : https://rosap.ntl.bts.gov/view/dot/94051
Fitzpatrick, K., Kockelman, K., Kutela, B., & Li, K. (2026). Investigation of Speed Countermeasures for Arterial Streets (Report No. FHWA/TX-27/0-7220-R1). Texas Transportation Institute. Texas A&M University. https://rosap.ntl.bts.gov/view/dot/94051

Fitzpatrick, Kay, Kara Kockelman, Boniphace Kutela, and Keya Li. Investigation of Speed Countermeasures for Arterial Streets. Report no. FHWA/TX-27/0-7220-R1. Texas Transportation Institute. Texas A&M University, 2026. https://rosap.ntl.bts.gov/view/dot/94051.

Fitzpatrick, Kay, et al. Investigation of Speed Countermeasures for Arterial Streets. Texas Transportation Institute. Texas A&M University, 2026, Report no. FHWA/TX-27/0-7220-R1, ROSA P. https://rosap.ntl.bts.gov/view/dot/94051.
Export RIS Citation Information. TY - Tech Report AU - Fitzpatrick, Kay AU - Kockelman, Kara AU - Kutela, Boniphace AU - Li, Keya A2 - Texas A&M Transportation Institute A3 - Texas Department of Transportation. Research and Technology Implementation Office A3 - United States. Department of Transportation. Federal Highway Administration AB - Vehicle speed is among the key attributes that make a difference in the injury severity outcome of a crash. This project started by reviewing the literature and existing toolkits to identify countermeasures to manage vehicle speeds and to improve safety especially for vulnerable road users on arterial street. A companion document, Speed Countermeasures for Arterial Streets Guide, provides information for implementation. Those countermeasures with the largest knowledge gaps were selected for additional investigation as part of this research project and included rest in red (RIR), roadway lighting, sidewalks, roundabout corridors, and reallocation of the cross section within a corridor. For the RIR countermeasure, the finding indicates the possibility of a reduction in crash rates and a slight increase in operating speed during nighttime conditions; however, the findings were not statistically significant perhaps due to the small sample size. For roadway lighting, a small increase in nighttime speed was indicated, which was not statistically significant. In contrast, the analysis indicates a statistically significant reduction in nighttime crash rates at treated sites relative to control locations. On lower-speed corridors, sidewalk implementation is associated with a slight reduction in operating speeds, suggesting a modest traffic-calming effect. In contrast, higher-speed corridors exhibit increases in operating speeds relative to comparison corridors after implementation, indicating that sidewalks alone do not substantially influence driver behavior in roadway environments that continue to support higher-speed travel. Sidewalk installation was associated with a reduction in fatal and injury crashes, suggesting potential safety benefits at the corridor level. Implementing a series of roundabouts is associated with a statistically significant reduction in operating speeds. For safety outcomes, treated corridors exhibit lower crash frequencies compared to control corridors; however, the estimated treatment effects for both total and pedestrian crashes are not statistically significant. The case study of the corridor cross-section reallocation found three of four zones had a speed reduction (business 3.2 mph, park 8.5 mph, and residential 4.3 mph) and fourth zone had a nominal speed increase of 0.4 mph, all statistically significant. AN - dot:94051 DA - 2026-10-01 ET - September 2024-August 2026 KW - Traffic speed KW - Safety management KW - Vulnerable road users KW - Arterial highways KW - Countermeasures KW - Case studies KW - Pedestrians KW - Traffic crashes KW - Roundabouts KW - Sidewalks KW - Nighttime crashes KW - Statistical analysis KW - Literature reviews KW - Speed Management LA - English PB - Texas Transportation Institute. Texas A&M University PY - 2026 SN - FHWA/TX-27/0-7220-R1 TI - Investigation of Speed Countermeasures for Arterial Streets M3 - Tech Report N1 - United States N1 - 0-7220 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/94051 ER -
Develop Best Practices for Flexible Pavement Repairs [Project Summary Report]

Nyamuhokya, Tito ;

Goehl, Darlene

2026-02-28 | PDF

Texas maintains one of the largest roadway networks in the U.S., with a goal of keeping 90% of its system in good or better condition. Preventive Maintenance (PM), particularly seal coats, is a key strategy for achieving this goal. The success of PM depends on timely and effective preparatory repair work. Pre-PM repairs, performed by in-house maint ...

10/19/2026

Title : Develop Best Practices for Flexible Pavement Repairs [Project Summary Report] Creator(s) : Nyamuhokya, Tito;Goehl, Darlene;Mistri, Abhijit;Moore, Drake;Liu, Kai-Wei; Corporate Creator(s) : Texas A&M Transportation Institute Corporate Contributor(s) : Texas Department of Transportation. Research and Technology Implementation Office;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-02-28 Report Number : 0-7175 URL : https://rosap.ntl.bts.gov/view/dot/94050
Nyamuhokya, T., Goehl, D., Mistri, A., Moore, D., & Liu, K. W. (2026). Develop Best Practices for Flexible Pavement Repairs [Project Summary Report] (Report No. 0-7175). Texas Transportation Institute. Texas A&M University. https://rosap.ntl.bts.gov/view/dot/94050

Nyamuhokya, Tito, Darlene Goehl, Abhijit Mistri, Drake Moore, and Kai-Wei Liu. Develop Best Practices for Flexible Pavement Repairs [Project Summary Report]. Report no. 0-7175. Texas Transportation Institute. Texas A&M University, 2026. https://rosap.ntl.bts.gov/view/dot/94050.

Nyamuhokya, Tito, et al. Develop Best Practices for Flexible Pavement Repairs [Project Summary Report]. Texas Transportation Institute. Texas A&M University, 2026, Report no. 0-7175, ROSA P. https://rosap.ntl.bts.gov/view/dot/94050.
Export RIS Citation Information. TY - Brief AU - Nyamuhokya, Tito AU - Goehl, Darlene AU - Mistri, Abhijit AU - Moore, Drake AU - Liu, Kai-Wei A2 - Texas A&M Transportation Institute A3 - Texas Department of Transportation. Research and Technology Implementation Office A3 - United States. Department of Transportation. Federal Highway Administration AB - Texas maintains one of the largest roadway networks in the U.S., with a goal of keeping 90% of its system in good or better condition. Preventive Maintenance (PM), particularly seal coats, is a key strategy for achieving this goal. The success of PM depends on timely and effective preparatory repair work. Pre-PM repairs, performed by in-house maintenance forces or contractors, may include crack-seal, fog seal, milling, level-up, and localized repairs. Completing these repairs well before the PM contract is critical to ensure proper curing and compatibility with the new surface. The study focuses on identifying the main flexible pavement repair types, determining best practices for both in-house and contracted repairs, and developing procedures to define repair limits and evaluate repair performance and its impact on PM surfacing. AN - dot:94050 DA - 2026-02-28 ET - Project Summary Report KW - Stability analysis KW - Seal coats KW - Rutting KW - Best practices KW - Flexible pavements KW - Repairing KW - Nondestructive tests KW - Literature reviews KW - Falling weight deflectometers KW - Ground penetrating radar KW - Pavement performance KW - Life cycle costing KW - Cracking KW - Durability LA - English PB - Texas Transportation Institute. Texas A&M University PY - 2026 SN - 0-7175 TI - Develop Best Practices for Flexible Pavement Repairs [Project Summary Report] M3 - Brief N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/94050 ER -
Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [Supporting Dataset 1 of 3]

Moorcroft, David M.

2026-09-30 | txt

This dataset contains simulation input and output representing sled tests. These data are created by computer simulations. The simulations were run in 2026. It is anticipated that aircraft seat manufacturers and test laboratories will benefit from access to this data as they design and test real aircraft seats and restraints. This dataset will also ...

10/19/2026

Supporting Files

Title : Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [Supporting Dataset 1 of 3] Creator(s) : Moorcroft, David M. Corporate Creator(s) : United States. Department of Transportation. Federal Aviation Administration. Civil Aerospace Medical Institute Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Aircraft Certification Service Published Date : 2026-09-30 DOI : https://doi.org/10.21949/1529736
Moorcroft, D. M. (2026). Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [Supporting Dataset 1 of 3]. United States. Department of Transportation. Federal Aviation Administration. Office of Aerospace Medicine. Civil Aerospace Medical Institute (CAMI). https://doi.org/10.21949/1529736

Moorcroft, David M.. Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [Supporting Dataset 1 of 3]. United States. Department of Transportation. Federal Aviation Administration. Office of Aerospace Medicine. Civil Aerospace Medical Institute (CAMI), 2026. https://doi.org/10.21949/1529736.

Moorcroft, David M. Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [Supporting Dataset 1 of 3]. United States. Department of Transportation. Federal Aviation Administration. Office of Aerospace Medicine. Civil Aerospace Medical Institute (CAMI), 2026, ROSA P. https://doi.org/10.21949/1529736.
Export RIS Citation Information. TY - Dataset AU - Moorcroft, David M. A2 - United States. Department of Transportation. Federal Aviation Administration. Civil Aerospace Medical Institute A3 - United States. Department of Transportation. Federal Aviation Administration. Aircraft Certification Service AB - This dataset contains simulation input and output representing sled tests. These data are created by computer simulations. The simulations were run in 2026. It is anticipated that aircraft seat manufacturers and test laboratories will benefit from access to this data as they design and test real aircraft seats and restraints. This dataset will also provide a public record to support potential rulemaking. AB - This item is made available under the terms of the Creative Commons Attribution 1.0 Universal (CC0 1.0) license https://creativecommons.org/publicdomain/zero/1.0/. Use the following citation: United States. Department of Transportation. Federal Aviation Administration. Office of Aviation. Office of Aerospace Medicine (2026). Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [supporting datasets]. https://doi.org/10.21949/1529736 AN - dot:94049 DA - 2026-09-30 DO - https://doi.org/10.21949/1529736 ET - 1 of 3 dataset records KW - Parts of seats KW - Seats KW - Foams KW - Loads KW - Dynamic tests KW - Aircraft KW - Lumbar Load LA - English PB - United States. Department of Transportation. Federal Aviation Administration. Office of Aerospace Medicine. Civil Aerospace Medical Institute (CAMI) PY - 2026 TI - Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [Supporting Dataset 1 of 3] M3 - Dataset N1 - United States N1 - This item is made available under the terms of the Creative Commons Attribution 1.0 Universal (CC0 1.0) license https://creativecommons.org/publicdomain/zero/1.0/. Use the following citation: United States. Department of Transportation. Federal Aviation Administration. Office of Aviation. Office of Aerospace Medicine (2026). Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions [supporting datasets]. https://doi.org/10.21949/1529736 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/94049 ER -
Prestress Losses in UHPC and Hybrid Precast, Prestressed Bridge Girders

Yadak, Omar

;

Floyd, Royce W.

2025-10-01 | PDF

This project evaluated long-term performance of precast/prestressed ultra-high performance concrete (UHPC) and hybrid UHPC-conventional self-consolidating concrete (SCC) bridge girders. The objectives of the research were to measure prestress losses and evaluate the effectiveness of different design details for mitigating stresses in the girder end ...

10/19/2026

Title : Prestress Losses in UHPC and Hybrid Precast, Prestressed Bridge Girders Creator(s) : Yadak, Omar;Floyd, Royce W.;Volz, Jeffery S.; Corporate Creator(s) : University of Oklahoma. School of Civil Engineering and Environmental Science Corporate Contributor(s) : Innovative Bridge Technologies/Accelerated Bridge Construction (IBT/ABC) Tier-1 University Transportation Center (UTC);United States. Department of Transportation. University Transportation Centers (UTC) Program;United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology; Published Date : 2025-10-01 Report Number : IBT/ABC-UTC-2024-C1-OU01-Final URL : https://rosap.ntl.bts.gov/view/dot/94048
Yadak, O., Floyd, R. W., & Volz, J. S. (2025). Prestress Losses in UHPC and Hybrid Precast, Prestressed Bridge Girders (Report No. IBT/ABC-UTC-2024-C1-OU01-Final). Innovative Bridge Technologies/Accelerated Bridge Construction (IBT/ABC) Tier-1 University Transportation Center (UTC). https://rosap.ntl.bts.gov/view/dot/94048

Yadak, Omar, Royce W. Floyd, and Jeffery S. Volz. Prestress Losses in UHPC and Hybrid Precast, Prestressed Bridge Girders. Report no. IBT/ABC-UTC-2024-C1-OU01-Final. Innovative Bridge Technologies/Accelerated Bridge Construction (IBT/ABC) Tier-1 University Transportation Center (UTC), 2025. https://rosap.ntl.bts.gov/view/dot/94048.

Yadak, Omar, et al. Prestress Losses in UHPC and Hybrid Precast, Prestressed Bridge Girders. Innovative Bridge Technologies/Accelerated Bridge Construction (IBT/ABC) Tier-1 University Transportation Center (UTC), 2025, Report no. IBT/ABC-UTC-2024-C1-OU01-Final, ROSA P. https://rosap.ntl.bts.gov/view/dot/94048.
Export RIS Citation Information. TY - Tech Report AU - Yadak, Omar AU - Floyd, Royce W. AU - Volz, Jeffery S. A2 - University of Oklahoma. School of Civil Engineering and Environmental Science A3 - Innovative Bridge Technologies/Accelerated Bridge Construction (IBT/ABC) Tier-1 University Transportation Center (UTC) A3 - United States. Department of Transportation. University Transportation Centers (UTC) Program A3 - United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology AB - This project evaluated long-term performance of precast/prestressed ultra-high performance concrete (UHPC) and hybrid UHPC-conventional self-consolidating concrete (SCC) bridge girders. The objectives of the research were to measure prestress losses and evaluate the effectiveness of different design details for mitigating stresses in the girder end region including their effect on hybrid girder capacity. Ten approximately half-scale AASHTO Type-II prestressed concrete girder specimens were cast, instrumented, and monitored over time to measure immediate and time-dependent prestress losses. These included one SCC specimen, three full UHPC specimens, five hybrid specimens consisting of SCC with UHPC in one end region, and one specimen consisting of a stay-in-place UHPC formwork shell and conventional concrete infill. UHPC mix designs developed at OU through funding by ODOT and ABC-UTC were utilized in this study. Different design details developed for reducing stresses and mitigating cracking in the end region of prestressed girders were also evaluated in the hybrid girders to determine the effects on girder performance. Five hybrid prestressed girders were successfully cast with a bi-fluid interface. The use of a wooden divider at the interface between UHPC and SCC helped to control the flow rate of the UHPC and SCC and maintain the two materials separated until the casting process was done. The UHPC end regions for all the hybrid prestressed girders had higher compressive stress compared to the SCC end regions, no cracks were observed in those end region after 150 days. However, some cracks were observed at the SCC end regions for some of the hybrid prestressed girders and the SCC girder. The time-dependent (creep and shrinkage) prestress losses behavior of the hybrid prestressed girders was similar to that of the SCC prestressed girder and full UHPC prestressed girders, indicating that the hybrid design did not appear to have an impact on the prestress losses at midspan. The length of the overall UHPC section in the hybrid prestressed girder did not have an effect on prestress loss behavior at midspan and the UHPC durability to withstand high compressive stresses at the end region. AN - dot:94048 DA - 2025-10-01 ET - Final Report (January 2024 - May 2025) KW - Ultra high performance concrete KW - Prestressed concrete KW - Losses KW - Precast concrete KW - Girders KW - Bridges KW - Hybrid LA - English PB - Innovative Bridge Technologies/Accelerated Bridge Construction (IBT/ABC) Tier-1 University Transportation Center (UTC) PY - 2025 SN - IBT/ABC-UTC-2024-C1-OU01-Final TI - Prestress Losses in UHPC and Hybrid Precast, Prestressed Bridge Girders M3 - Tech Report N1 - United States N1 - 69A3552348322 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/94048 ER -
Development of Concrete Materials Infused with Biochar for Bridge Applications

Bullard, Jeffrey

;

Kim, Yong-Rak

2025-07-01 | PDF

In portland cement concrete, biochar additions efficiently accelerate setting, increase the initial rate hardening, and promote the precipitation of secondary minerals to fill capillary pores, all key aspects of accelerated bridge construction. However, biochar has variable properties and performance in concrete, especially at early ages. We invest ...

10/19/2026

Title : Development of Concrete Materials Infused with Biochar for Bridge Applications Creator(s) : Bullard, Jeffrey;Kim, Yong-Rak;Jeon, In Kyu; Corporate Creator(s) : Texas A&M University. Zachry Department of Civil and Environmental Engineering Corporate Contributor(s) : Innovative Bridge Technologies/Accelerated Bridge Construction (IBT/ABC) Tier-1 University Transportation Center (UTC);United States. Department of Transportation. University Transportation Centers (UTC) Program;United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology; Published Date : 2025-07-01 Report Number : IBT/ABC-UTC-2024-C1-TAMU01-Final URL : https://rosap.ntl.bts.gov/view/dot/94047
Bullard, J., Kim, Y. R., & Jeon, I. K. (2025). Development of Concrete Materials Infused with Biochar for Bridge Applications (Report No. IBT/ABC-UTC-2024-C1-TAMU01-Final). Innovative Bridge Technologies/Accelerated Bridge Construction (IBT/ABC) Tier-1 University Transportation Center (UTC). https://rosap.ntl.bts.gov/view/dot/94047

Bullard, Jeffrey, Yong-Rak Kim, and In Kyu Jeon. Development of Concrete Materials Infused with Biochar for Bridge Applications. Report no. IBT/ABC-UTC-2024-C1-TAMU01-Final. Innovative Bridge Technologies/Accelerated Bridge Construction (IBT/ABC) Tier-1 University Transportation Center (UTC), 2025. https://rosap.ntl.bts.gov/view/dot/94047.

Bullard, Jeffrey, et al. Development of Concrete Materials Infused with Biochar for Bridge Applications. Innovative Bridge Technologies/Accelerated Bridge Construction (IBT/ABC) Tier-1 University Transportation Center (UTC), 2025, Report no. IBT/ABC-UTC-2024-C1-TAMU01-Final, ROSA P. https://rosap.ntl.bts.gov/view/dot/94047.
Export RIS Citation Information. TY - Tech Report AU - Bullard, Jeffrey AU - Kim, Yong-Rak AU - Jeon, In Kyu A2 - Texas A&M University. Zachry Department of Civil and Environmental Engineering A3 - Innovative Bridge Technologies/Accelerated Bridge Construction (IBT/ABC) Tier-1 University Transportation Center (UTC) A3 - United States. Department of Transportation. University Transportation Centers (UTC) Program A3 - United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology AB - In portland cement concrete, biochar additions efficiently accelerate setting, increase the initial rate hardening, and promote the precipitation of secondary minerals to fill capillary pores, all key aspects of accelerated bridge construction. However, biochar has variable properties and performance in concrete, especially at early ages. We investigated how biochar surface area, composition, and water absorption influence the rheological properties, hydration rates, and strength development of fresh and hardened concrete material. Two different biochar sources were characterized for specific surface area, porosity, composition, and particle size distribution, and were used to partially replace portland cement in cement binders. The fresh hydration rates, rheological properties, and setting times were monitored by isothermal calorimetry, rotational rheometry, and Vicat penetration, respectively. With 5 w% biochar replacement, setting times were 25 % lower, 7-d compressive strengths were 25 % greater, and secondary mineralization rates were enhanced by 25 % relative to control materials without biochar. These results show that low-volume biochar additions in concrete can both accelerate bridge construction and can potentially provide a material with enhanced mechanical performance. AN - dot:94047 DA - 2025-07-01 ET - Final Report (January 2024- July 2025) KW - Concrete KW - Biochar KW - Pozzolan KW - Curing and setting agents KW - Compressive strength LA - English PB - Innovative Bridge Technologies/Accelerated Bridge Construction (IBT/ABC) Tier-1 University Transportation Center (UTC) PY - 2025 SN - IBT/ABC-UTC-2024-C1-TAMU01-Final TI - Development of Concrete Materials Infused with Biochar for Bridge Applications M3 - Tech Report N1 - United States N1 - 69A3552348322 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/94047 ER -
Announcing a New Freight Seminar: Freight Data Made Simple

United States. Department of Transportation. Federal Highway Administration

2004-12-01 | PDF

The FHWA Resource Center and Office of Freight Management and Operations are offering a new seminar, Freight Data Made Simple. This seminar is part of FHWA's Freight Professional Development Program and is offered to broaden the knowledge base and skills of freight transportation planners and other professionals.

10/19/2026

Title : Announcing a New Freight Seminar: Freight Data Made Simple Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations Contributor(s) : Randall, Lisa Published Date : 2004-12-01 URL : https://rosap.ntl.bts.gov/view/dot/94046
United States. Department of Transportation. Federal Highway Administration (2004). Announcing a New Freight Seminar: Freight Data Made Simple. United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/94046

United States. Department of Transportation. Federal Highway Administration. Announcing a New Freight Seminar: Freight Data Made Simple. United States. Department of Transportation. Federal Highway Administration, 2004. https://rosap.ntl.bts.gov/view/dot/94046.

United States. Department of Transportation. Federal Highway Administration Announcing a New Freight Seminar: Freight Data Made Simple. United States. Department of Transportation. Federal Highway Administration, 2004, ROSA P. https://rosap.ntl.bts.gov/view/dot/94046.
Export RIS Citation Information. TY - Booklet/Pamphlet A2 - United States. Department of Transportation. Federal Highway Administration A3 - United States. Department of Transportation. Federal Highway Administration. Office of Freight Management and Operations AB - The FHWA Resource Center and Office of Freight Management and Operations are offering a new seminar, Freight Data Made Simple. This seminar is part of FHWA's Freight Professional Development Program and is offered to broaden the knowledge base and skills of freight transportation planners and other professionals. AN - dot:94046 DA - 2004-12-01 KW - Freight transportation KW - Continuing education KW - Data collection KW - Data analysis LA - English PB - United States. Department of Transportation. Federal Highway Administration PY - 2004 TI - Announcing a New Freight Seminar: Freight Data Made Simple M3 - Booklet/Pamphlet N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/94046 ER -
Urban Freight Integration with Protected Bike Lanes Chicago, IL: Noteworthy Practice

United States. Department of Transportation. Federal Highway Administration

2017-11-01 | PDF

The City of Chicago is a leader in promoting and implementing context-sensitive street design solutions. In 2006, the City adopted a complete streets policy to accommodate and balance the needs of all transportation system users, including freight operators, as part of transportation project planning and delivery. In 2013, the City released its Com ...

10/19/2026

Title : Urban Freight Integration with Protected Bike Lanes Chicago, IL: Noteworthy Practice Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration. Office of Operations Contributor(s) : Burnell, Tamiko;Amsden, Mike; Published Date : 2017-11-01 Report Number : FHWA-HOP-16-080 URL : https://rosap.ntl.bts.gov/view/dot/94045
United States. Department of Transportation. Federal Highway Administration (2017). Urban Freight Integration with Protected Bike Lanes Chicago, IL: Noteworthy Practice (Report No. FHWA-HOP-16-080). United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/94045

United States. Department of Transportation. Federal Highway Administration. Urban Freight Integration with Protected Bike Lanes Chicago, IL: Noteworthy Practice. Report no. FHWA-HOP-16-080. United States. Department of Transportation. Federal Highway Administration, 2017. https://rosap.ntl.bts.gov/view/dot/94045.

United States. Department of Transportation. Federal Highway Administration Urban Freight Integration with Protected Bike Lanes Chicago, IL: Noteworthy Practice. United States. Department of Transportation. Federal Highway Administration, 2017, Report no. FHWA-HOP-16-080, ROSA P. https://rosap.ntl.bts.gov/view/dot/94045.
Export RIS Citation Information. TY - Brief A2 - United States. Department of Transportation. Federal Highway Administration A3 - United States. Department of Transportation. Federal Highway Administration. Office of Operations AB - The City of Chicago is a leader in promoting and implementing context-sensitive street design solutions. In 2006, the City adopted a complete streets policy to accommodate and balance the needs of all transportation system users, including freight operators, as part of transportation project planning and delivery. In 2013, the City released its Complete Streets Design Guidelines to help implement the 2006 policy. Recognizing the need for sufficient and safe commercial loading and unloading zones, the City included integration of these zones in their protected bicycle lane designs. Protected bicycle lanes (also referred to as separated bicycle lanes by the Federal Highway Administration) use physical barriers and visual cues such as bollards, curbs, pavement markings, and parked cars to separate bicyclists from motorists and freight operations, helping improve safety for all transportation system users. These facilities help deconflict curbside truck deliveries and can also benefit truck movements along a corridor by separating freight and bicycling activities with a physical buffer and providing a clearly delineated space for each. Since 2012, the Chicago Department of Transportation (CDOT) has installed several protected bicycle lanes integrated with loading zones along several commercial corridors in the downtown area. CDOT also installed a modified version of a protected bike lane, buffered only by pavement markings, on a key truck route along Elston Avenue. AN - dot:94045 DA - 2017-11-01 KW - Urban transportation KW - Bicycle lanes KW - Freight traffic KW - Context sensitive design KW - Loading and unloading LA - English PB - United States. Department of Transportation. Federal Highway Administration PY - 2017 SN - FHWA-HOP-16-080 TI - Urban Freight Integration with Protected Bike Lanes Chicago, IL: Noteworthy Practice M3 - Brief N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/94045 ER -
Virtual Weigh Stations and Weigh-in-Motion (WIM) Technology in Maryland and New York: Noteworthy Practice

United States. Department of Transportation. Federal Highway Administration

2017-07-01 | PDF

The Maryland State Highway Administration (MSHA) is using weigh-in-motion (WIM) technology at ten "virtual" weigh stations to support law enforcement activities and generate traffic data for use in future highway and congestion planning. New York City Department of Transportation (NYCDOT), in cooperation with New York State DOT (NYSDOT) and the Por ...

10/19/2026

Title : Virtual Weigh Stations and Weigh-in-Motion (WIM) Technology in Maryland and New York: Noteworthy Practice Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration. Office of Operations Contributor(s) : Burnell, Tamiko;Pansare, Manoj;Czorapinski, Dave;Peters, Diniece D.; Published Date : 2017-07-01 Report Number : FHWA-HOP-17-059 URL : https://rosap.ntl.bts.gov/view/dot/94044
United States. Department of Transportation. Federal Highway Administration (2017). Virtual Weigh Stations and Weigh-in-Motion (WIM) Technology in Maryland and New York: Noteworthy Practice (Report No. FHWA-HOP-17-059). United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/94044

United States. Department of Transportation. Federal Highway Administration. Virtual Weigh Stations and Weigh-in-Motion (WIM) Technology in Maryland and New York: Noteworthy Practice. Report no. FHWA-HOP-17-059. United States. Department of Transportation. Federal Highway Administration, 2017. https://rosap.ntl.bts.gov/view/dot/94044.

United States. Department of Transportation. Federal Highway Administration Virtual Weigh Stations and Weigh-in-Motion (WIM) Technology in Maryland and New York: Noteworthy Practice. United States. Department of Transportation. Federal Highway Administration, 2017, Report no. FHWA-HOP-17-059, ROSA P. https://rosap.ntl.bts.gov/view/dot/94044.
Export RIS Citation Information. TY - Brief A2 - United States. Department of Transportation. Federal Highway Administration A3 - United States. Department of Transportation. Federal Highway Administration. Office of Operations AB - The Maryland State Highway Administration (MSHA) is using weigh-in-motion (WIM) technology at ten "virtual" weigh stations to support law enforcement activities and generate traffic data for use in future highway and congestion planning. New York City Department of Transportation (NYCDOT), in cooperation with New York State DOT (NYSDOT) and the Port Authority of New York and New Jersey, is using three WIM sites to collect and analyze truck weight data. NYCDOT is also using the information from these sites to inform its management of truck routes. AN - dot:94044 DA - 2017-07-01 KW - Weigh in motion KW - Weigh stations KW - Data collection KW - Vehicle weight KW - Law enforcement LA - English PB - United States. Department of Transportation. Federal Highway Administration PY - 2017 SN - FHWA-HOP-17-059 TI - Virtual Weigh Stations and Weigh-in-Motion (WIM) Technology in Maryland and New York: Noteworthy Practice M3 - Brief N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/94044 ER -
Truck Driver Training for Safe Urban Operations in San Francisco, CA: Noteworthy Practice

United States. Department of Transportation. Federal Highway Administration

2017-09-01 | PDF

In 2015, in support of the Vision Zero San Francisco policy, the San Francisco Municipal Transportation Agency (SFMTA) developed a curriculum and video training for safe operation of large vehicles in urban areas. SFMTA also required drivers of vehicles over 10,000 pounds who were employed, contracted, and permitted by the City and County of San Fr ...

10/19/2026

Title : Truck Driver Training for Safe Urban Operations in San Francisco, CA: Noteworthy Practice Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration. Office of Operations Contributor(s) : Burnell, Tamiko;White, John Knox; Published Date : 2017-09-01 Report Number : FHWA-HOP-17-060 URL : https://rosap.ntl.bts.gov/view/dot/94043
United States. Department of Transportation. Federal Highway Administration (2017). Truck Driver Training for Safe Urban Operations in San Francisco, CA: Noteworthy Practice (Report No. FHWA-HOP-17-060). United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/94043

United States. Department of Transportation. Federal Highway Administration. Truck Driver Training for Safe Urban Operations in San Francisco, CA: Noteworthy Practice. Report no. FHWA-HOP-17-060. United States. Department of Transportation. Federal Highway Administration, 2017. https://rosap.ntl.bts.gov/view/dot/94043.

United States. Department of Transportation. Federal Highway Administration Truck Driver Training for Safe Urban Operations in San Francisco, CA: Noteworthy Practice. United States. Department of Transportation. Federal Highway Administration, 2017, Report no. FHWA-HOP-17-060, ROSA P. https://rosap.ntl.bts.gov/view/dot/94043.
Export RIS Citation Information. TY - Brief A2 - United States. Department of Transportation. Federal Highway Administration A3 - United States. Department of Transportation. Federal Highway Administration. Office of Operations AB - In 2015, in support of the Vision Zero San Francisco policy, the San Francisco Municipal Transportation Agency (SFMTA) developed a curriculum and video training for safe operation of large vehicles in urban areas. SFMTA also required drivers of vehicles over 10,000 pounds who were employed, contracted, and permitted by the City and County of San Francisco (CCSF) to complete the training. The goal of the training program is to reduce the number of bicycle and pedestrian fatalities caused by collisions with large vehicles. Crashes involving large vehicles and pedestrians/bicyclists are low-frequency, but high-severity events. From 2007 to 2011, large vehicles were involved in only four percent of all vehicle collisions in San Francisco, yet they accounted for 17 percent of all fatalities. Furthermore, pedestrians and cyclists were over eight times more likely to be killed in a crash with a large vehicle than with a car. The training program also encourages private companies to adopt the curriculum and incorporate urban driving safety principles into California's commercial driver licensing curriculum. Over 6,400 drivers are estimated to have completed the SFMTA training since 2015. (More information is available at https://www.sfmta.com/blog/drivebig-truck-heres-how-go-big-safety.) AN - dot:94043 DA - 2017-09-01 KW - Truck drivers KW - Commercial drivers KW - Driver training KW - Traffic safety KW - Urban transportation LA - English PB - United States. Department of Transportation. Federal Highway Administration PY - 2017 SN - FHWA-HOP-17-060 TI - Truck Driver Training for Safe Urban Operations in San Francisco, CA: Noteworthy Practice M3 - Brief N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/94043 ER -
In-the-Field Safety Training for City Truck Drivers in London, England: Noteworthy Practice

United States. Department of Transportation. Federal Highway Administration

2017-09-01 | PDF

Transport for London (TfL) is Greater London's local government body responsible for regional transportation. In 2011, TfL implemented a seven-hour Safe Urban Driving (SUD) course for truck drivers to improve truck operation safety in urban areas within the region. This training is comprised of a classroom module and a practical, on-bicycle module. ...

10/19/2026

Title : In-the-Field Safety Training for City Truck Drivers in London, England: Noteworthy Practice Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration. Office of Operations Contributor(s) : Burnell, Tamiko;Davies, Glen;Binham, Peter; Published Date : 2017-09-01 Report Number : FHWA-HOP-18-019 URL : https://rosap.ntl.bts.gov/view/dot/94042
United States. Department of Transportation. Federal Highway Administration (2017). In-the-Field Safety Training for City Truck Drivers in London, England: Noteworthy Practice (Report No. FHWA-HOP-18-019). United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/94042

United States. Department of Transportation. Federal Highway Administration. In-the-Field Safety Training for City Truck Drivers in London, England: Noteworthy Practice. Report no. FHWA-HOP-18-019. United States. Department of Transportation. Federal Highway Administration, 2017. https://rosap.ntl.bts.gov/view/dot/94042.

United States. Department of Transportation. Federal Highway Administration In-the-Field Safety Training for City Truck Drivers in London, England: Noteworthy Practice. United States. Department of Transportation. Federal Highway Administration, 2017, Report no. FHWA-HOP-18-019, ROSA P. https://rosap.ntl.bts.gov/view/dot/94042.
Export RIS Citation Information. TY - Brief A2 - United States. Department of Transportation. Federal Highway Administration A3 - United States. Department of Transportation. Federal Highway Administration. Office of Operations AB - Transport for London (TfL) is Greater London's local government body responsible for regional transportation. In 2011, TfL implemented a seven-hour Safe Urban Driving (SUD) course for truck drivers to improve truck operation safety in urban areas within the region. This training is comprised of a classroom module and a practical, on-bicycle module. To create demand for this training, TfL incorporated driver training requirements into two national voluntary certification programs for fleet safety. TfL and major infrastructure projects also require drivers of contracted fleets and drivers servicing city-permitted construction projects to complete SUD training. TfL considers SUD training one of its most successful freight safety initiatives, with about 50,000 truck drivers (nearly 20 percent of all truck drivers in the United Kingdom [UK]) trained as of September 2017. More information is available at https://www.fors-online.org.uk/cms/safe-urban-driving/. AN - dot:94042 DA - 2017-09-01 KW - Truck drivers KW - Commercial drivers KW - Driver training KW - Traffic safety KW - Urban transportation LA - English PB - United States. Department of Transportation. Federal Highway Administration PY - 2017 SN - FHWA-HOP-18-019 TI - In-the-Field Safety Training for City Truck Drivers in London, England: Noteworthy Practice M3 - Brief N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/94042 ER -
Behavioral/Agent-Based Supply Chain Modeling Research Synthesis: Model Approaches

United States. Department of Transportation. Federal Highway Administration

2018-02-13 | PDF

A handful of public agencies in the United States are in the process of developing-or have already developed-behavioral/agent-based models of supply chain decisions and freight movements. The uptick in development of these new models is largely attributable to the planning need for better freight forecasts. Federal Highway Administration (FHWA) Bro ...

10/19/2026

Title : Behavioral/Agent-Based Supply Chain Modeling Research Synthesis: Model Approaches Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration Corporate Contributor(s) : Second Strategic Highway Research Program (SHRP2) Contributor(s) : Shabani, Kaveh;Outwater, Maren L.;Smith, Colin;Purdy, Jeffrey; Published Date : 2018-02-13 URL : https://rosap.ntl.bts.gov/view/dot/94041
United States. Department of Transportation. Federal Highway Administration (2018). Behavioral/Agent-Based Supply Chain Modeling Research Synthesis: Model Approaches. United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/94041

United States. Department of Transportation. Federal Highway Administration. Behavioral/Agent-Based Supply Chain Modeling Research Synthesis: Model Approaches. United States. Department of Transportation. Federal Highway Administration, 2018. https://rosap.ntl.bts.gov/view/dot/94041.

United States. Department of Transportation. Federal Highway Administration Behavioral/Agent-Based Supply Chain Modeling Research Synthesis: Model Approaches. United States. Department of Transportation. Federal Highway Administration, 2018, ROSA P. https://rosap.ntl.bts.gov/view/dot/94041.
Export RIS Citation Information. TY - Brief A2 - United States. Department of Transportation. Federal Highway Administration A3 - Second Strategic Highway Research Program (SHRP2) AB - A handful of public agencies in the United States are in the process of developing-or have already developed-behavioral/agent-based models of supply chain decisions and freight movements. The uptick in development of these new models is largely attributable to the planning need for better freight forecasts. Federal Highway Administration (FHWA) Broad Agency Announcement awards and the Strategic Highway Research Program (SHRP2) C20 program provided funding for these new approaches to designing and implementing freight demand modeling. These include agent-based supply chain freight models currently in use in Baltimore Metropolitan Council (BMC), Chicago Metropolitan Agency for Planning (CMAP), Florida Department of Transportation (FDOT), Metro (Portland, Oregon), Phoenix's Maricopa Association of Governments (MAG), and Wisconsin Department of Transportation (WisDOT). A number of these agencies additionally funded their own efforts, including Metro who added funding for data collection, and CMAP who added funding beyond the initial research. AN - dot:94041 DA - 2018-02-13 KW - Supply chain management KW - Freight transportation KW - Traffic models KW - Commodity flow LA - English PB - United States. Department of Transportation. Federal Highway Administration PY - 2018 TI - Behavioral/Agent-Based Supply Chain Modeling Research Synthesis: Model Approaches M3 - Brief N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/94041 ER -
Behavioral/Agent-Based Supply Chain Modeling Research Synthesis: Data Challenges

United States. Department of Transportation. Federal Highway Administration

2018-02-13 | PDF

Acquiring the data and finding the resources required to support a behavioral supply chain model is often challenging, given the privacy and confidentiality issues surrounding supply chain data. Many data sources exist for estimating, calibrating, validating, and forecasting a freight modeling system. Advanced freight travel demand modeling in the ...

10/19/2026

Title : Behavioral/Agent-Based Supply Chain Modeling Research Synthesis: Data Challenges Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration Corporate Contributor(s) : Second Strategic Highway Research Program (SHRP2) Contributor(s) : Shabani, Kaveh;Outwater, Maren L.;Smith, Colin;Purdy, Jeffrey; Published Date : 2018-02-13 URL : https://rosap.ntl.bts.gov/view/dot/94040
United States. Department of Transportation. Federal Highway Administration (2018). Behavioral/Agent-Based Supply Chain Modeling Research Synthesis: Data Challenges. United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/94040

United States. Department of Transportation. Federal Highway Administration. Behavioral/Agent-Based Supply Chain Modeling Research Synthesis: Data Challenges. United States. Department of Transportation. Federal Highway Administration, 2018. https://rosap.ntl.bts.gov/view/dot/94040.

United States. Department of Transportation. Federal Highway Administration Behavioral/Agent-Based Supply Chain Modeling Research Synthesis: Data Challenges. United States. Department of Transportation. Federal Highway Administration, 2018, ROSA P. https://rosap.ntl.bts.gov/view/dot/94040.
Export RIS Citation Information. TY - Brief A2 - United States. Department of Transportation. Federal Highway Administration A3 - Second Strategic Highway Research Program (SHRP2) AB - Acquiring the data and finding the resources required to support a behavioral supply chain model is often challenging, given the privacy and confidentiality issues surrounding supply chain data. Many data sources exist for estimating, calibrating, validating, and forecasting a freight modeling system. Advanced freight travel demand modeling in the United States use publicly available data sources to model freight movements such as the Freight Analysis Framework (FAF)1. Publicly available data sources are often sufficient for applying the behavioral supply chain models, but not for development, calibration or validation, where additional data sources are needed. AN - dot:94040 DA - 2018-02-13 KW - Supply chain management KW - Freight transportation KW - Traffic models KW - Commodity flow LA - English PB - United States. Department of Transportation. Federal Highway Administration PY - 2018 TI - Behavioral/Agent-Based Supply Chain Modeling Research Synthesis: Data Challenges M3 - Brief N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/94040 ER -
Behavioral/Agent-Based Supply Chain Modeling Research Synthesis: Model Applications

United States. Department of Transportation. Federal Highway Administration

2018-02-13 | PDF

Behavioral supply chain models can be used for myriad policy applications. These are dependent upon the specific components that are included and can be categorized into two main types of modeling systems: 1) national supply chain models; and 2) regional truck touring models.

10/19/2026

Title : Behavioral/Agent-Based Supply Chain Modeling Research Synthesis: Model Applications Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration Corporate Contributor(s) : Second Strategic Highway Research Program (SHRP2) Contributor(s) : Shabani, Kaveh;Outwater, Maren L.;Smith, Colin;Purdy, Jeffrey; Published Date : 2018-02-13 URL : https://rosap.ntl.bts.gov/view/dot/94039
United States. Department of Transportation. Federal Highway Administration (2018). Behavioral/Agent-Based Supply Chain Modeling Research Synthesis: Model Applications. United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/94039

United States. Department of Transportation. Federal Highway Administration. Behavioral/Agent-Based Supply Chain Modeling Research Synthesis: Model Applications. United States. Department of Transportation. Federal Highway Administration, 2018. https://rosap.ntl.bts.gov/view/dot/94039.

United States. Department of Transportation. Federal Highway Administration Behavioral/Agent-Based Supply Chain Modeling Research Synthesis: Model Applications. United States. Department of Transportation. Federal Highway Administration, 2018, ROSA P. https://rosap.ntl.bts.gov/view/dot/94039.
Export RIS Citation Information. TY - Brief A2 - United States. Department of Transportation. Federal Highway Administration A3 - Second Strategic Highway Research Program (SHRP2) AB - Behavioral supply chain models can be used for myriad policy applications. These are dependent upon the specific components that are included and can be categorized into two main types of modeling systems: 1) national supply chain models; and 2) regional truck touring models. AN - dot:94039 DA - 2018-02-13 KW - Supply chain management KW - Freight transportation KW - Traffic models KW - Commodity flow LA - English PB - United States. Department of Transportation. Federal Highway Administration PY - 2018 TI - Behavioral/Agent-Based Supply Chain Modeling Research Synthesis: Model Applications M3 - Brief N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/94039 ER -
Use of Color Changeable Message Signs - Current Practices and Research

Hoekstra-Atwood, Liberty ;

Campbell, John L.

2022-04-01 | PDF

Two overarching objectives of the Use of Color Changeable Message Signs (CMSs) - Current Practice and Research project are (1) to understand how agencies are displaying messages and using CMSs capable of displaying color, and (2) provide information on illuminated color displays from research reviewed that may help in establishing future color Chan ...

10/19/2026

Title : Use of Color Changeable Message Signs - Current Practices and Research Creator(s) : Hoekstra-Atwood, Liberty;Campbell, John L.;Hoover, Connor;Katz, Bryan;Kehoe, Nicholas; Corporate Creator(s) : Battelle Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration. Office of Operations Contributor(s) : Chu, Jimmy Published Date : 2022-04-01 Report Number : FHWA-HOP-18-067 URL : https://rosap.ntl.bts.gov/view/dot/94038
Hoekstra-Atwood, L., Campbell, J. L., Hoover, C., Katz, B., & Kehoe, N. (2022). Use of Color Changeable Message Signs - Current Practices and Research (Report No. FHWA-HOP-18-067). United States. Department of Transportation. Federal Highway Administration. Office of Operations. https://rosap.ntl.bts.gov/view/dot/94038

Hoekstra-Atwood, Liberty, John L. Campbell, Connor Hoover, Bryan Katz, and Nicholas Kehoe. Use of Color Changeable Message Signs - Current Practices and Research. Report no. FHWA-HOP-18-067. United States. Department of Transportation. Federal Highway Administration. Office of Operations, 2022. https://rosap.ntl.bts.gov/view/dot/94038.

Hoekstra-Atwood, Liberty, et al. Use of Color Changeable Message Signs - Current Practices and Research. United States. Department of Transportation. Federal Highway Administration. Office of Operations, 2022, Report no. FHWA-HOP-18-067, ROSA P. https://rosap.ntl.bts.gov/view/dot/94038.
Export RIS Citation Information. TY - Tech Report AU - Hoekstra-Atwood, Liberty AU - Campbell, John L. AU - Hoover, Connor AU - Katz, Bryan AU - Kehoe, Nicholas A2 - Battelle A3 - United States. Department of Transportation. Federal Highway Administration. Office of Operations A4 - Chu, Jimmy AB - Two overarching objectives of the Use of Color Changeable Message Signs (CMSs) - Current Practice and Research project are (1) to understand how agencies are displaying messages and using CMSs capable of displaying color, and (2) provide information on illuminated color displays from research reviewed that may help in establishing future color Changeable Message Sign (CMS) display policy and practice. This report presents information based on available literature, research, and current practices from the limited number of States using colors on CMSs. This report may assist transportation agencies with identifying the range of issues to consider and possible implications with integrating color in the display of different types of messages (e.g., combination of text and symbols, symbols only) on color CMSs. The information in this report may also assist with supporting the identification of issues to address in future efforts to develop technical resources, procedures, policies, or research in support of the use and display of messages on color CMSs. This report does not alter or supersede the national standards for the use and display of CMSs set forth in the Manual on Uniform Traffic Control Devices for Streets and Highways (MUTCD). Messages displayed on CMSs within roadway or highway rights-of-way in the United States are required to follow the provisions in the MUTCD. Though many provisions throughout the MUTCD apply to the operation of CMSs as a traffic control device, Chapter 2L of the MUTCD provides standards and guidance unique to the use and display of messages specific to the characteristics and capabilities of CMSs. AN - dot:94038 DA - 2022-04-01 KW - Variable message signs KW - Color KW - Traffic control devices KW - Guidelines LA - English PB - United States. Department of Transportation. Federal Highway Administration. Office of Operations PY - 2022 SN - FHWA-HOP-18-067 TI - Use of Color Changeable Message Signs - Current Practices and Research M3 - Tech Report N1 - United States N1 - DTFH61-12-D-00049 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/94038 ER -
Develop Best Practices for Flexible Pavement Repairs

Nyamuhokya, Tito ;

Goehl, Darlene

2026-09-01 | PDF

Texas plans to invest over $18 trillion in preventive maintenance (PM) and rehabilitation between FY 2026 and 2035, allocating one-third specifically to PM. This significant investment must be protected through ongoing enhancements to techniques that extend the life of PM treatments, especially seal coats, which make up the bulk of Texas's PM effor ...

10/19/2026

Supporting Files

Title : Develop Best Practices for Flexible Pavement Repairs Creator(s) : Nyamuhokya, Tito;Goehl, Darlene;Liu, Kai-Wei;Mistri, Abhijit; Corporate Creator(s) : Texas A&M Transportation Institute Corporate Contributor(s) : Texas Department of Transportation. Research and Technology Implementation Office;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-09-01 Report Number : FHWA/TX-25/0-7175-R1 URL : https://rosap.ntl.bts.gov/view/dot/94037
Nyamuhokya, T., Goehl, D., Liu, K. W., & Mistri, A. (2026). Develop Best Practices for Flexible Pavement Repairs (Report No. FHWA/TX-25/0-7175-R1). Texas Transportation Institute. Texas A&M University. https://rosap.ntl.bts.gov/view/dot/94037

Nyamuhokya, Tito, Darlene Goehl, Kai-Wei Liu, and Abhijit Mistri. Develop Best Practices for Flexible Pavement Repairs. Report no. FHWA/TX-25/0-7175-R1. Texas Transportation Institute. Texas A&M University, 2026. https://rosap.ntl.bts.gov/view/dot/94037.

Nyamuhokya, Tito, et al. Develop Best Practices for Flexible Pavement Repairs. Texas Transportation Institute. Texas A&M University, 2026, Report no. FHWA/TX-25/0-7175-R1, ROSA P. https://rosap.ntl.bts.gov/view/dot/94037.
Export RIS Citation Information. TY - Tech Report AU - Nyamuhokya, Tito AU - Goehl, Darlene AU - Liu, Kai-Wei AU - Mistri, Abhijit A2 - Texas A&M Transportation Institute A3 - Texas Department of Transportation. Research and Technology Implementation Office A3 - United States. Department of Transportation. Federal Highway Administration AB - Texas plans to invest over $18 trillion in preventive maintenance (PM) and rehabilitation between FY 2026 and 2035, allocating one-third specifically to PM. This significant investment must be protected through ongoing enhancements to techniques that extend the life of PM treatments, especially seal coats, which make up the bulk of Texas's PM efforts. This study focused on identifying best practices for pre-PM flexible pavement repairs to ensure durability and cost-effectiveness. The research included a review of existing literature, analysis of Texas Department of Transportation (TxDOT) Pavement Management Information System (PMIS) data from 2019-2023, and TxDOT district surveys to identify types of asphalt pavement distress, repair methods, constraints, and performance trends. Results show that repair decisions mainly rely on visual inspections and PMIS scores, with little use of nondestructive testing. Factors such as repair type (e.g., crack sealing, level-up, and base repair), material availability, variations in curing time, and budget play key roles in determining outcomes. Advanced tools-such as Grind Diagnostic, falling weight deflectometer, dynamic cone penetrometer, and ground penetrating radar-were examined to help define repair scopes and improve structural assessments. The study created a standardized decision framework and repair guidelines that support better preparatory work, extend PM lifespan, and reduce lifecycle costs. Implementing these best practices across the state will improve system reliability, lower the risk of early failures, and strengthen TxDOT's ability to achieve performance goals. AN - dot:94037 DA - 2026-09-01 ET - September 2023 to February 2026 KW - Stability analysis KW - Seal coats KW - Rutting KW - Best practices KW - Flexible pavements KW - Repairing KW - Nondestructive tests KW - Literature reviews KW - Falling weight deflectometers KW - Ground penetrating radar KW - Pavement performance KW - Life cycle costing KW - Cracking KW - Durability KW - Stability, seal coat, shoving, rutting LA - English PB - Texas Transportation Institute. Texas A&M University PY - 2026 SN - FHWA/TX-25/0-7175-R1 TI - Develop Best Practices for Flexible Pavement Repairs M3 - Tech Report N1 - United States N1 - 0-7175 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/94037 ER -
Develop an Interactive Statewide Production Rate Estimation Tool for Reliable Contract Time Determination [Project Summary Report]

Jeong, H. David

;

Gurganus, Charles

2026-08-31 | PDF

The objective of this project was to improve the reliability and practical usability of production rate estimation by providing recommendations for updating the TxDOT Construction Production Rates Table and developing an interactive web-based production rate estimation and visualization tool.

10/19/2026

Title : Develop an Interactive Statewide Production Rate Estimation Tool for Reliable Contract Time Determination [Project Summary Report] Creator(s) : Jeong, H. David;Gurganus, Charles;Devadas, Arvind;Suk, Janghwan; Corporate Creator(s) : Texas A&M University System. Texas Transportation Institute Corporate Contributor(s) : Texas Department of Transportation. Research and Technology Implementation Office;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-08-31 Report Number : 0-7174 URL : https://rosap.ntl.bts.gov/view/dot/94036
Jeong, H. D., Gurganus, C., Devadas, A., & Suk, J. (2026). Develop an Interactive Statewide Production Rate Estimation Tool for Reliable Contract Time Determination [Project Summary Report] (Report No. 0-7174). Texas Transportation Institute. Texas A&M University. https://rosap.ntl.bts.gov/view/dot/94036

Jeong, H. David, Charles Gurganus, Arvind Devadas, and Janghwan Suk. Develop an Interactive Statewide Production Rate Estimation Tool for Reliable Contract Time Determination [Project Summary Report]. Report no. 0-7174. Texas Transportation Institute. Texas A&M University, 2026. https://rosap.ntl.bts.gov/view/dot/94036.

Jeong, H. David, et al. Develop an Interactive Statewide Production Rate Estimation Tool for Reliable Contract Time Determination [Project Summary Report]. Texas Transportation Institute. Texas A&M University, 2026, Report no. 0-7174, ROSA P. https://rosap.ntl.bts.gov/view/dot/94036.
Export RIS Citation Information. TY - Brief AU - Jeong, H. David AU - Gurganus, Charles AU - Devadas, Arvind AU - Suk, Janghwan A2 - Texas A&M University System. Texas Transportation Institute A3 - Texas Department of Transportation. Research and Technology Implementation Office A3 - United States. Department of Transportation. Federal Highway Administration AB - The objective of this project was to improve the reliability and practical usability of production rate estimation by providing recommendations for updating the TxDOT Construction Production Rates Table and developing an interactive web-based production rate estimation and visualization tool. AN - dot:94036 DA - 2026-08-31 ET - Project Summary Report KW - Construction scheduling KW - Contract administration KW - Estimating KW - Multiple criteria decision making KW - Productivity KW - Project delivery KW - Web applications KW - Data collection KW - Visualization LA - English PB - Texas Transportation Institute. Texas A&M University PY - 2026 SN - 0-7174 TI - Develop an Interactive Statewide Production Rate Estimation Tool for Reliable Contract Time Determination [Project Summary Report] M3 - Brief N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/94036 ER -
Importance of Fine Aggregates in Achieving Adequate Skid Resistance in TxDOT Hot Mix Asphalt Mixtures

Khan, M. Aamish H. ;

Omole, Adegboyega

2026-08-01 | PDF

Skid resistance is a critical roadway-safety characteristic, but it is not routinely evaluated during asphalt mixture design. TxDOT Project 0-7108 evaluated practical methods for improving the long-term frictional performance of hot-mix asphalt mixtures, particularly mixtures containing aggregates with relatively low polishing resistance. The exper ...

10/19/2026

Title : Importance of Fine Aggregates in Achieving Adequate Skid Resistance in TxDOT Hot Mix Asphalt Mixtures Creator(s) : Khan, M. Aamish H.;Omole, Adegboyega;Reddy, G. Sandeep;Montoya, Miguel;Abdallah, Imad;Nazarian, Soheil; Corporate Creator(s) : University of Texas at El Paso. Center for Transportation Infrastructure Systems Corporate Contributor(s) : Texas Department of Transportation. Research and Technology Implementation Office;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-08-01 Report Number : FHWA/TX-27/0-7108-1;R1B; URL : https://rosap.ntl.bts.gov/view/dot/94035
Khan, M. A. H., Omole, A., Reddy, G. S., Montoya, M., Abdallah, I., & Nazarian, S. (2026). Importance of Fine Aggregates in Achieving Adequate Skid Resistance in TxDOT Hot Mix Asphalt Mixtures (Report No. FHWA/TX-27/0-7108-1). University of Texas at El Paso. Center for Transportation Infrastructure Systems. https://rosap.ntl.bts.gov/view/dot/94035

Khan, M. Aamish H., Adegboyega Omole, G. Sandeep Reddy, Miguel Montoya, Imad Abdallah, and Soheil Nazarian. Importance of Fine Aggregates in Achieving Adequate Skid Resistance in TxDOT Hot Mix Asphalt Mixtures. Report no. FHWA/TX-27/0-7108-1. University of Texas at El Paso. Center for Transportation Infrastructure Systems, 2026. https://rosap.ntl.bts.gov/view/dot/94035.

Khan, M. Aamish H., et al. Importance of Fine Aggregates in Achieving Adequate Skid Resistance in TxDOT Hot Mix Asphalt Mixtures. University of Texas at El Paso. Center for Transportation Infrastructure Systems, 2026, Report no. FHWA/TX-27/0-7108-1, ROSA P. https://rosap.ntl.bts.gov/view/dot/94035.
Export RIS Citation Information. TY - Tech Report AU - Khan, M. Aamish H. AU - Omole, Adegboyega AU - Reddy, G. Sandeep AU - Montoya, Miguel AU - Abdallah, Imad AU - Nazarian, Soheil A2 - University of Texas at El Paso. Center for Transportation Infrastructure Systems A3 - Texas Department of Transportation. Research and Technology Implementation Office A3 - United States. Department of Transportation. Federal Highway Administration AB - Skid resistance is a critical roadway-safety characteristic, but it is not routinely evaluated during asphalt mixture design. TxDOT Project 0-7108 evaluated practical methods for improving the long-term frictional performance of hot-mix asphalt mixtures, particularly mixtures containing aggregates with relatively low polishing resistance. The experimental program examined material-related factors (binder grade and aggregate type), mixture-design factors (binder content, aggregate gradation, mixture type, and the distribution of aggregate types within individual gradation fractions), and a construction-related factor (air-void content). Laboratory specimens were polished with the Three-Wheel Polishing Device (TWPD), and friction was measured with the Dynamic Friction Tester (DFT). Field sections and producer mixture designs were also evaluated, and the modified mixtures were checked for rutting, cracking, and moisture-damage performance. Within the materials and ranges evaluated, aggregate type had the dominant effect on long-term friction, whereas binder grade, binder content, overall gradation, mixture type, and air-void content had comparatively small effects after the binder film was removed. Fraction-specific testing showed that the intermediate aggregate fraction-passing the No. 4 sieve and retained on the No. 30 sieve (4.75-0.60 mm)-was especially important. The No. 4-to-No. 16 subfraction (4.75-1.18 mm)provided the largest contribution, while replacing only the material passing the No. 30 sieve provided little benefit. Targeted replacement of low-friction aggregate in the critical fraction improved terminal DFT friction while limiting the quantity of premium aggregate required. Producer case studies increased terminal DFV from 0.21 to 0.28 for an SP-C mixture and from 0.25 to 0.32 for an SMA-D mixture without compromising the evaluated mechanical performance. The proposed laboratory friction levels and the approximately 0.30 terminal-DFV screening value should be considered provisional until they are correlated with field friction and validated through implementation projects. AN - dot:94035 DA - 2026-08-01 ET - Final Report: Aug 2021 - Aug 2026 KW - Skid resistance KW - Asphalt mixtures KW - Friction KW - Testing KW - Fine aggregates KW - Hot mix asphalt KW - Laboratory tests KW - Rutting KW - Cracking KW - Moisture damage KW - Case studies KW - Asphalt Frictional Performance KW - Dynamic Friction Tester KW - Three-Wheel Polishing Device LA - English PB - University of Texas at El Paso. Center for Transportation Infrastructure Systems PY - 2026 SN - FHWA/TX-27/0-7108-1 TI - Importance of Fine Aggregates in Achieving Adequate Skid Resistance in TxDOT Hot Mix Asphalt Mixtures M3 - Tech Report N1 - United States N1 - 0-7108 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/94035 ER -

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