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Showing 1 - 20 of 427 results

Oral Fluid Testing Program Case Studies

Symoun, Jennifer

2026-08-01 | PDF

From July to August 2025, NHTSA gathered information regarding oral fluid testing programs in five States, Alabama, Indiana, Kansas, New York, and Washington. Each case study summarizes program implementation, best practices and learnings. The report identifies common keys to success, including the necessity of early stakeholder engagement, rigorou ...

08/28/2026

Title : Oral Fluid Testing Program Case Studies Creator(s) : Symoun, Jennifer Corporate Creator(s) : toXcel, LLC Corporate Contributor(s) : United States. Department of Transportation. National Highway Traffic Safety Administration. Office of Behavioral Safety Research Published Date : 2026-08-01 Report Number : DOT HS 813 865 DOI : https://doi.org/10.21949/rdmr-xp73
Symoun, Jennifer (2026). Oral Fluid Testing Program Case Studies. https://doi.org/10.21949/rdmr-xp73

Symoun, Jennifer "Oral Fluid Testing Program Case Studies" (2026), https://doi.org/10.21949/rdmr-xp73

Symoun, Jennifer "Oral Fluid Testing Program Case Studies" , 2026, https://doi.org/10.21949/rdmr-xp73
Export RIS Citation Information. TY - Tech Report AU - Symoun, Jennifer A2 - toXcel, LLC A3 - United States. Department of Transportation. National Highway Traffic Safety Administration. Office of Behavioral Safety Research A4 - Conlon, Jennifer AB - From July to August 2025, NHTSA gathered information regarding oral fluid testing programs in five States, Alabama, Indiana, Kansas, New York, and Washington. Each case study summarizes program implementation, best practices and learnings. The report identifies common keys to success, including the necessity of early stakeholder engagement, rigorous scientific validation, and the importance of transparent communication with the judiciary and the public. AN - dot:93148 DO - https://doi.org/10.21949/rdmr-xp73 KW - Drug tests KW - Laboratory tests KW - Drugged drivers KW - Forensic science KW - Case studies KW - Law enforcement KW - Saliva LA - English PB - United States. Department of Transportation. National Highway Traffic Safety Administration PY - 2026-08-01 SN - DOT HS 813 865 TI - Oral Fluid Testing Program Case Studies M3 - Tech Report N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/93148 ER - DB - ROSA P
Boston Harbor Islands National Recreation Area Ferry Service and Operations Study: Final Summary Report

Ireland, Larissa ;

Koch, David

2026-05-01 | PDF

This ferry service and operations study is intended to evaluate current conditions and explore opportunities to improve the overall visitor experience of the Boston Harbor Islands ferry service. This analysis covers Phase I of a multi-phase effort that aims to examine and enhance the overall ferry boat operations. The study is being performed by th ...

08/26/2026

Title : Boston Harbor Islands National Recreation Area Ferry Service and Operations Study: Final Summary Report Creator(s) : Ireland, Larissa;Koch, David;Work, Remi;Powell, Trevor;Sydoriak, Jason;Shelby, Jennifer;Mannheim, Daniel;DeBold, Paige;Tran, Hoamy;Lamoureux, Katie; Corporate Creator(s) : John A. Volpe National Transportation Systems Center (U.S.) Corporate Contributor(s) : United States. National Park Service. Interior Region 1;North Atlantic-Appalachian Alternative Transportation Program; Published Date : 2026-05-01 URL : https://rosap.ntl.bts.gov/view/dot/93146
Ireland, Larissa et al. (2026). Boston Harbor Islands National Recreation Area Ferry Service and Operations Study: Final Summary Report.

Ireland, Larissa et al. "Boston Harbor Islands National Recreation Area Ferry Service and Operations Study: Final Summary Report" (2026)

Ireland, Larissa et al. "Boston Harbor Islands National Recreation Area Ferry Service and Operations Study: Final Summary Report" , 2026
Export RIS Citation Information. TY - Tech Report AU - Ireland, Larissa AU - Koch, David AU - Work, Remi AU - Powell, Trevor AU - Sydoriak, Jason AU - Shelby, Jennifer AU - Mannheim, Daniel AU - DeBold, Paige AU - Tran, Hoamy AU - Lamoureux, Katie A2 - John A. Volpe National Transportation Systems Center (U.S.) A3 - United States. National Park Service. Interior Region 1 A3 - North Atlantic-Appalachian Alternative Transportation Program AB - This ferry service and operations study is intended to evaluate current conditions and explore opportunities to improve the overall visitor experience of the Boston Harbor Islands ferry service. This analysis covers Phase I of a multi-phase effort that aims to examine and enhance the overall ferry boat operations. The study is being performed by the U.S. DOT Volpe Center (Volpe) for the National Park Service (NPS) Boston Harbor Islands (BOHA) National Recreation Area (NRA), Boston National Historical Park (BOST), and Boston Harbor Now (BHN) which manages the park's ferry system. This study aims to identify operational alternatives that optimize the ferry system, increase visitation, and support equitable public access to BOHA-BOST. The findings from this study will inform a future infrastructure needs assessment that will explore design considerations for potential acquisition of different vessel types to support operational needs. This study is intended to inform future planning and decision-making. Public input and additional analysis during Phase 2 of the BOHA Ferry Study will help inform any future decisions. AN - dot:93146 KW - Access KW - Ferry service KW - Intermodal services KW - Marine transportation KW - National parks KW - Transportation planning LA - English PB - John A. Volpe National Transportation Systems Center (U.S.) PY - 2026-05-01 TI - Boston Harbor Islands National Recreation Area Ferry Service and Operations Study: Final Summary Report M3 - Tech Report N1 - United States N1 - P23PG00213 UR - https://rosap.ntl.bts.gov/view/dot/93146 ER - DB - ROSA P
Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions

Moorcroft, David M.

2026-08-01 | PDF

The Federal Aviation Administration (FAA) requires that aircraft seating systems protect occupants in the event of an emergency landing. During the combined longitudinal-vertical impact, the seat bottom cushion significantly affects the loads transferred to the occupant's spine, and therefore the risk of injury. Previous testing revealed test-to-te ...

08/26/2026

Title : Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions 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 : 2026-08-01 Report Number : DOT/FAA/AM-26/13 DOI : https://doi.org/10.21949/1529735
Moorcroft, David M. (2026). Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions. https://doi.org/10.21949/1529735

Moorcroft, David M. "Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions" (2026), https://doi.org/10.21949/1529735

Moorcroft, David M. "Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions" , 2026, https://doi.org/10.21949/1529735
Export RIS Citation Information. TY - Tech Report 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 - The Federal Aviation Administration (FAA) requires that aircraft seating systems protect occupants in the event of an emergency landing. During the combined longitudinal-vertical impact, the seat bottom cushion significantly affects the loads transferred to the occupant's spine, and therefore the risk of injury. Previous testing revealed test-to-test lumbar load variability as high as 18%, which was hypothesized to arise in part from variation within foam material properties. In this study, a high-rate load frame was used to measure cushion force-deflection behavior, and those data were then used as inputs to a computational model to estimate the effect of cushion-property variability on predicted lumbar load. 13 credibility factors were used to support a determination that the model was adequate for answering the question of interest. While the loading curves varied by as much as 23%, the predicted peak lumbar load varied by no more than 7.4%. These findings suggest that test uncertainty due solely to differences within cushion material properties is lower than that from other sources of uncertainty in full-scale sled tests. AN - dot:93145 DO - https://doi.org/10.21949/1529735 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 - 2026-08-01 SN - DOT/FAA/AM-26/13 TI - Use of a Simplified Model to Evaluate Lumbar Load Variability in Dynamic Testing of Transport Category Aircraft Seat Cushions M3 - Tech Report N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/93145 ER - DB - ROSA P
Exploring Driver Adaptation to L2 Driving Automation Using Existing Naturalistic Driving Data

Klauer, S. G. ;

Turturici, Marissa

2026-08-01 | PDF

This research explored the concept of behavioral adaptation - how humans respond to introduction of a new technology that serves a specific need of the driver. Three existing naturalistic driving study databases were analyzed: (a) the L2 Naturalistic Driving Study, (b) the Virginia Connected Corridor Elite Naturalistic Driving Study, and (c) the Ol ...

08/25/2026

Title : Exploring Driver Adaptation to L2 Driving Automation Using Existing Naturalistic Driving Data Creator(s) : Klauer, S. G.;Turturici, Marissa;Han, S.;Russell, S;Guo, F.;Noble, A;Antin, J F; Corporate Creator(s) : Virginia Tech Transportation Institute Corporate Contributor(s) : United States. Department of Transportation. National Highway Traffic Safety Administration. Office of Vehicle Safety Research Published Date : 2026-08-01 Report Number : DOT HS 813 827 DOI : https://doi.org/10.21949/hcf8-kh48
Klauer, S. G. et al. (2026). Exploring Driver Adaptation to L2 Driving Automation Using Existing Naturalistic Driving Data. https://doi.org/10.21949/hcf8-kh48

Klauer, S. G. et al. "Exploring Driver Adaptation to L2 Driving Automation Using Existing Naturalistic Driving Data" (2026), https://doi.org/10.21949/hcf8-kh48

Klauer, S. G. et al. "Exploring Driver Adaptation to L2 Driving Automation Using Existing Naturalistic Driving Data" , 2026, https://doi.org/10.21949/hcf8-kh48
Export RIS Citation Information. TY - Tech Report AU - Klauer, S. G. AU - Turturici, Marissa AU - Han, S. AU - Russell, S AU - Guo, F. AU - Noble, A AU - Antin, J F A2 - Virginia Tech Transportation Institute A3 - United States. Department of Transportation. National Highway Traffic Safety Administration. Office of Vehicle Safety Research A4 - Gray, Jazzie AB - This research explored the concept of behavioral adaptation - how humans respond to introduction of a new technology that serves a specific need of the driver. Three existing naturalistic driving study databases were analyzed: (a) the L2 Naturalistic Driving Study, (b) the Virginia Connected Corridor Elite Naturalistic Driving Study, and (c) the Older Driver L2 Naturalistic Driving Study. The results illustrated an increase in eye off road metrics when L2 systems were active. Results further suggested that driver adaptation was present for high-risk secondary tasks, where there was a significant increase in engagement when L2 systems were active. Additionally, drivers set their vehicle speed above the speed limit more frequently over time, with higher speeds set when L2 systems were active. AN - dot:93144 DO - https://doi.org/10.21949/hcf8-kh48 KW - Driver support systems KW - Driving behavior KW - Level 2 driving automation KW - Autonomous intelligent cruise control KW - Distracted driving KW - Speeding KW - Driver behavior KW - Driver adaptation LA - English PB - United States. Department of Transportation. National Highway Traffic Safety Administration PY - 2026-08-01 SN - DOT HS 813 827 TI - Exploring Driver Adaptation to L2 Driving Automation Using Existing Naturalistic Driving Data M3 - Tech Report N1 - United States N1 - 693JJ918D000006, Task Order 693JJ919F000121 UR - https://rosap.ntl.bts.gov/view/dot/93144 ER - DB - ROSA P
Duraflex Curb

Outcalt, William (Skip)

2007-02-01 | PDF

DuraFlex Curb, an erosion control alternate for timber, concrete, or bituminous curbing placed with guardrail, has been submitted for consideration for the CDOT Approved Products List (APL). DuraFlex Curb is made of HDPE in an "L-shape." The vertical arm of the "L" provides a six-inch high vertical section placed at the face of the guardrail posts. ...

08/24/2026

Title : Duraflex Curb Creator(s) : Outcalt, William (Skip) Corporate Creator(s) : Colorado. Department of Transportation. Applied Research & Innovations Branch Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 2007-02-01 Report Number : CDOT-2007-3 URL : https://rosap.ntl.bts.gov/view/dot/93143
Outcalt, William (Skip) (2007). Duraflex Curb.

Outcalt, William (Skip) "Duraflex Curb" (2007)

Outcalt, William (Skip) "Duraflex Curb" , 2007
Export RIS Citation Information. TY - Tech Report AU - Outcalt, William (Skip) A2 - Colorado. Department of Transportation. Applied Research & Innovations Branch A3 - United States. Department of Transportation. Federal Highway Administration AB - DuraFlex Curb, an erosion control alternate for timber, concrete, or bituminous curbing placed with guardrail, has been submitted for consideration for the CDOT Approved Products List (APL). DuraFlex Curb is made of HDPE in an "L-shape." The vertical arm of the "L" provides a six-inch high vertical section placed at the face of the guardrail posts. The eighteen-inch wide horizontal arm sits flat on the existing pavement and is overlaid with hot mix asphalt. Projects on US-24 in Region 2 and on US-50 in Region 5 were selected for evaluation. On US-24 approximately one thousand feet of the DuraFlex Curb were placed in two 500' test sections. On US-50 approximately two thousand feet of DuraFlex Curb were installed. On the US-50 project approximately seven thousand feet of composite lumber curb were installed for evaluation also. This report evaluates the performance of the two products in comparison to lumber curb. AN - dot:93143 ET - Final Report KW - Erosion KW - Runoff KW - Road shoulders KW - Hot mix asphalt KW - Lumber KW - Concrete aggregates KW - Composite materials KW - Alternatives analysis KW - Guardrails LA - English PB - Colorado Department of Transportation. Applied Research & Innovations Branch PY - 2007-02-01 SN - CDOT-2007-3 TI - Duraflex Curb M3 - Tech Report N1 - United States N1 - 96-01 UR - https://rosap.ntl.bts.gov/view/dot/93143 ER - DB - ROSA P
Before and After Study of Safety Improvement Projects on State Highways Funded Through the Highway Safety Improvement Program

Hurwitz, David

;

Jashami, Hisham

2026-08-01 | PDF

This study develops a transferable framework for the analysis of three low-cost safety improvement projects installed on state highways in Oregon; specifically Rectangular Rapid Flashing Beacon (RRFB), Shoulder Rumble Strips (SRS), and Two-Way to Four-Way Stop Conversion. A before-after EB study was performed for RRFB and SRS. A cross-sectional ana ...

08/24/2026

Title : Before and After Study of Safety Improvement Projects on State Highways Funded Through the Highway Safety Improvement Program Creator(s) : Hurwitz, David;Jashami, Hisham;Maharjan, Timila; Corporate Creator(s) : Oregon State University. School of Civil and Construction Engineering Corporate Contributor(s) : Oregon. Department of Transportation. Research Section;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-08-01 Report Number : FHWA-PL-27-01;31896; URL : https://rosap.ntl.bts.gov/view/dot/93142
Hurwitz, David et al. (2026). Before and After Study of Safety Improvement Projects on State Highways Funded Through the Highway Safety Improvement Program.

Hurwitz, David and Jashami, Hisham and Maharjan, Timila "Before and After Study of Safety Improvement Projects on State Highways Funded Through the Highway Safety Improvement Program" (2026)

Hurwitz, David et al. "Before and After Study of Safety Improvement Projects on State Highways Funded Through the Highway Safety Improvement Program" , 2026
Export RIS Citation Information. TY - Tech Report AU - Hurwitz, David AU - Jashami, Hisham AU - Maharjan, Timila A2 - Oregon State University. School of Civil and Construction Engineering A3 - Oregon. Department of Transportation. Research Section A3 - United States. Department of Transportation. Federal Highway Administration AB - This study develops a transferable framework for the analysis of three low-cost safety improvement projects installed on state highways in Oregon; specifically Rectangular Rapid Flashing Beacon (RRFB), Shoulder Rumble Strips (SRS), and Two-Way to Four-Way Stop Conversion. A before-after EB study was performed for RRFB and SRS. A cross-sectional analysis was conducted for stop control conversion in the absence of installation data. For RRFB, the Crash Modification Factor (CMF) for total pedestrian crashes was found to be 0.481. The total crashes and rear-end crashes were also found to have reduced by 27% and 14%, respectively. The CMF for total crashes and run-off-road crashes in the presence of SRS was found to be 0.72 and 0.73, respectively. The result from the cross-sectional analysis suggested that four-way stops are associated with approximately a 15.7% reduction in crashes compared to two-way stops. AN - dot:93142 ET - Final Report KW - Before and after studies KW - Flashing beacons KW - Road shoulders KW - Rumble strips KW - Stopping KW - Highway safety KW - Road improvements KW - State highways KW - Crash modification factors KW - Data analysis KW - Rectangular rapid flashing beacon KW - Shoulder rumble strip KW - Two-way stop control KW - Four-way stop control LA - English PB - Arizona. Dept. of Transportation. Research Center PY - 2026-08-01 SN - FHWA-PL-27-01 TI - Before and After Study of Safety Improvement Projects on State Highways Funded Through the Highway Safety Improvement Program M3 - Tech Report N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/93142 ER - DB - ROSA P
Developing Guidance on Leading Pedestrian Intervals and Curb Extensions to Improve Pedestrian Safety at Signalized Intersections

Hurwitz, David

;

Jashami, Hisham

2026-08-01 | PDF

Improving pedestrian safety continues to be critically important to ODOT's mission to provide a safe and reliable multimodal transportation system. This research provides ODOT with refined tools to improve pedestrian safety at signalized intersections by developing enhanced guidance on when and where to implement Leading Pedestrian Intervals (LPI) ...

08/24/2026

Supporting Files

Title : Developing Guidance on Leading Pedestrian Intervals and Curb Extensions to Improve Pedestrian Safety at Signalized Intersections Creator(s) : Hurwitz, David;Jashami, Hisham;Rangel, Elsa A. Moreno;Monsere, Chris;Kothuri, Sirisha;Semensky, Sophia; Corporate Creator(s) : Oregon State University;Portland State University; Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration;Oregon. Department of Transportation. Research Section; Published Date : 2026-08-01 Report Number : FHWA-OR-RD-27-06 URL : https://rosap.ntl.bts.gov/view/dot/93141
Hurwitz, David et al. (2026). Developing Guidance on Leading Pedestrian Intervals and Curb Extensions to Improve Pedestrian Safety at Signalized Intersections.

Hurwitz, David et al. "Developing Guidance on Leading Pedestrian Intervals and Curb Extensions to Improve Pedestrian Safety at Signalized Intersections" (2026)

Hurwitz, David et al. "Developing Guidance on Leading Pedestrian Intervals and Curb Extensions to Improve Pedestrian Safety at Signalized Intersections" , 2026
Export RIS Citation Information. TY - Tech Report AU - Hurwitz, David AU - Jashami, Hisham AU - Rangel, Elsa A. Moreno AU - Monsere, Chris AU - Kothuri, Sirisha AU - Semensky, Sophia A2 - Oregon State University A2 - Portland State University A3 - United States. Department of Transportation. Federal Highway Administration A3 - Oregon. Department of Transportation. Research Section AB - Improving pedestrian safety continues to be critically important to ODOT's mission to provide a safe and reliable multimodal transportation system. This research provides ODOT with refined tools to improve pedestrian safety at signalized intersections by developing enhanced guidance on when and where to implement Leading Pedestrian Intervals (LPI) either solely or in conjunction with complementary treatments such as Curb Extensions (CE). The guidance was informed by four major tasks: a literature review, a conflict-based field study, a driving simulator study, and development of an LPI suitability assessment tool. This research found that CEs decrease vehicle turning speed and shift conflicts from high/medium to low severity. For conflicts involving speed, both CEs & LPIs reduced conflicts, with the addition of the CE providing additional conflict reduction. The findings from this research support ODOT's Strategic Action Plan as well as ODOT design and practice documents. AN - dot:93141 ET - Final Report KW - Pedestrian clearance interval KW - Curbs KW - Turning traffic KW - Pedestrian safety KW - Signalized intersections KW - Guidance systems KW - Literature reviews KW - Field studies KW - Strategic planning KW - Multimodal transportation KW - Leading pedestrian interval KW - curb extension KW - accessible pedestrian signal KW - no turn on red LA - English PB - Oregon. Department of Transportation. Research Section PY - 2026-08-01 SN - FHWA-OR-RD-27-06 TI - Developing Guidance on Leading Pedestrian Intervals and Curb Extensions to Improve Pedestrian Safety at Signalized Intersections M3 - Tech Report N1 - United States N1 - SPR 877 UR - https://rosap.ntl.bts.gov/view/dot/93141 ER - DB - ROSA P
Portland Cement Concrete Pavement Review of QC/QA Data 2000 Through 2004

Chavez, Eric

2006-01-01 | PDF

This report analyzes the Quality Control/Quality Assurance (QC/QA) data for Portland Cement Concrete Pavement (PCCP) constructed in the years 2000 through 2004. Analysis of the overall performance of the projects was accomplished by reviewing the Calculated Pay Factor Composite (CPFC) and Incentive/Disincentive Payments (I/DP). Analysis of each of ...

08/24/2026

Title : Portland Cement Concrete Pavement Review of QC/QA Data 2000 Through 2004 Creator(s) : Chavez, Eric Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 2006-01-01 Report Number : CDOT-DTD-R-2006-5 URL : https://rosap.ntl.bts.gov/view/dot/93140
Chavez, Eric (2006). Portland Cement Concrete Pavement Review of QC/QA Data 2000 Through 2004.

Chavez, Eric "Portland Cement Concrete Pavement Review of QC/QA Data 2000 Through 2004" (2006)

Chavez, Eric "Portland Cement Concrete Pavement Review of QC/QA Data 2000 Through 2004" , 2006
Export RIS Citation Information. TY - Tech Report AU - Chavez, Eric A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - This report analyzes the Quality Control/Quality Assurance (QC/QA) data for Portland Cement Concrete Pavement (PCCP) constructed in the years 2000 through 2004. Analysis of the overall performance of the projects was accomplished by reviewing the Calculated Pay Factor Composite (CPFC) and Incentive/Disincentive Payments (I/DP). Analysis of each of the test elements: thickness, compressive strength, sand equivalent, and flexural strength has been completed. The results of the evaluation are presented in tables, figures, and reports. The PCCP on the projects evaluated from 2000 through 2004 have shown good test results. The average incentive payment is above 3.8% in each of the years. Over the five-year time period the average is above 3.9%, maximum incentive being 5%. All projects evaluated received some amount of incentive payment for the PCCP. Of the 36 projects evaluated 19 received incentive payments greater than 4%. Two of these projects received the maximum incentive of 5%. Over the five-year time period the CPFC has remained at a constant level. AN - dot:93140 ET - Final Report KW - Quality control KW - Quality assurance KW - Incentives KW - Compressive strength KW - Flexural strength KW - Thickness KW - Sand equivalent test KW - Portland cement concrete KW - quality levels KW - percent within limits KW - Incentive/Disincentive Payments (I/DP) compressive strength LA - English PB - Colorado. Department of Transportation PY - 2006-01-01 SN - CDOT-DTD-R-2006-5 TI - Portland Cement Concrete Pavement Review of QC/QA Data 2000 Through 2004 M3 - Tech Report N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/93140 ER - DB - ROSA P
National Travel Time Dashboard: Interstate Highways, December 2025

United States. Department of Transportation. Federal Highway Administration. Office of Operations

2025-12-01 | National Travel Time Dashboard: Interstate Highways | PDF

The Monthly Urban Congestion Report (UCR) provides a state-level overview of traffic congestion and reliability trends on Interstate highways. Published every month, the report compares data from the most recent month with the same month in the previous year. It uses travel time data from the Federal Highway Administration's National Performance Ma ...

08/24/2026

Title : National Travel Time Dashboard: Interstate Highways, December 2025 Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration. Office of Operations Published Date : 2025-12-01 Series : National Travel Time Dashboard: Interstate Highways URL : https://rosap.ntl.bts.gov/view/dot/93139
United States. Department of Transportation. Federal Highway Administration. Office of Operations (2025). National Travel Time Dashboard: Interstate Highways, December 2025.

United States. Department of Transportation. Federal Highway Administration. Office of Operations "National Travel Time Dashboard: Interstate Highways, December 2025" (2025)

United States. Department of Transportation. Federal Highway Administration. Office of Operations "National Travel Time Dashboard: Interstate Highways, December 2025" , 2025
Export RIS Citation Information. TY - Statistical Report A2 - United States. Department of Transportation. Federal Highway Administration. Office of Operations AB - The Monthly Urban Congestion Report (UCR) provides a state-level overview of traffic congestion and reliability trends on Interstate highways. Published every month, the report compares data from the most recent month with the same month in the previous year. It uses travel time data from the Federal Highway Administration's National Performance Management Research Data Set (NPMRDS) and traffic volume data from the Highway Performance Monitoring System (HPMS). The report includes Interstate highway data from all 50 U.S. states and the District of Columbia. AN - dot:93139 KW - Traffic congestion KW - Travel time KW - Traffic volume KW - Urban transportation KW - Statistical reliability KW - Data collection KW - Data analysis LA - English PB - United States. Department of Transportation. Federal Highway Administration. Office of Operations PY - 2025-12-01 T2 - National Travel Time Dashboard: Interstate Highways TI - National Travel Time Dashboard: Interstate Highways, December 2025 M3 - Statistical Report N1 - United States N1 - Public Domain UR - https://rosap.ntl.bts.gov/view/dot/93139 ER - DB - ROSA P
CDOT Foundation Design Practice and LRFD Strategic Plan

Chang, Nien-Yin

2006-02-01 | PDF

The Colorado Department of Transportation (CDOT) has adopted the AASHTO LRFD Bridge Design Specifications for the design of all highway bridges. This prompt implementation of the LRFD code was possible because of the history of LFD and ASD designs and the uniformity of the structural materials, concrete and steel. The implementation of geotechnical ...

08/24/2026

Title : CDOT Foundation Design Practice and LRFD Strategic Plan Creator(s) : Chang, Nien-Yin Corporate Creator(s) : University of Colorado at Denver Corporate Contributor(s) : Colorado. Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 2006-02-01 Report Number : CDOT-DTD-R-2006-7 URL : https://rosap.ntl.bts.gov/view/dot/93138
Chang, Nien-Yin (2006). CDOT Foundation Design Practice and LRFD Strategic Plan.

Chang, Nien-Yin "CDOT Foundation Design Practice and LRFD Strategic Plan" (2006)

Chang, Nien-Yin "CDOT Foundation Design Practice and LRFD Strategic Plan" , 2006
Export RIS Citation Information. TY - Tech Report AU - Chang, Nien-Yin A2 - University of Colorado at Denver A3 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - The Colorado Department of Transportation (CDOT) has adopted the AASHTO LRFD Bridge Design Specifications for the design of all highway bridges. This prompt implementation of the LRFD code was possible because of the history of LFD and ASD designs and the uniformity of the structural materials, concrete and steel. The implementation of geotechnical LRFD is hampered by the non-uniformity of the geological materials, soils and rocks, which requires the evaluation of the state-specific resistance factors. The process of evaluation and calibration of resistance factors is complex and time-consuming. It is based on the theory of probability and reliability. It requires the creation of a property database through a long-term data collection, the evaluation of property statistics, the formulation of probability density function for each property of each geological material, the determination of probability of failure, and the selection of reliability of index. In civil engineering designs the failure probability is determined by a code committee and, in the AASHTO code, the failure probability is determined to be 1/10,000. Fostering a smooth process for the design of bridges and bridge foundations requires the implementation of both structural and geotechnical LRFD procedures. The FHWA has set the Year 2007 as the target time for the full implementation of the AASHTO LRFD Bridge Design Specifications and it is urgent for CDOT to devote effort to the implementation of geotechnical LRFD, which requires both financial and time commitment from all concerned parties, particularly the CDOT Central Administration. This study has found that the CDOT geotechnical practice is severely deficient in manpower and field test equipment. Without immediate remedial actions the quality of CDOT geotechnical services will be of great concern. The formation of an LRFD Committee with members from the CDOT Administration, Bridge Branch, Materials Laboratory (Geotechnical and Soil-Rockfall Programs), and Research Branch; structural and geotechnical engineering communities; and academia is recommended to strategize the implementation of the geotechnical LRFD procedures. AN - dot:93138 ET - Final Report KW - Load and resistance factor design KW - Static penetration test KW - Finite element method KW - Bridge design KW - Piers KW - Foundation engineering KW - Strategic planning KW - Geotechnical engineering KW - Soils KW - allowable stress design (ASD) LA - English PB - Colorado. Department of Transportation PY - 2006-02-01 SN - CDOT-DTD-R-2006-7 TI - CDOT Foundation Design Practice and LRFD Strategic Plan M3 - Tech Report N1 - United States N1 - PG: 01HQ562 UR - https://rosap.ntl.bts.gov/view/dot/93138 ER - DB - ROSA P
National Travel Time Dashboard: Interstate Highways, November 2025

United States. Department of Transportation. Federal Highway Administration. Office of Operations

2025-11-01 | National Travel Time Dashboard: Interstate Highways | PDF

The Monthly Urban Congestion Report (UCR) provides a state-level overview of traffic congestion and reliability trends on Interstate highways. Published every month, the report compares data from the most recent month with the same month in the previous year. It uses travel time data from the Federal Highway Administration's National Performance Ma ...

08/24/2026

Title : National Travel Time Dashboard: Interstate Highways, November 2025 Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration. Office of Operations Published Date : 2025-11-01 Series : National Travel Time Dashboard: Interstate Highways URL : https://rosap.ntl.bts.gov/view/dot/93137
United States. Department of Transportation. Federal Highway Administration. Office of Operations (2025). National Travel Time Dashboard: Interstate Highways, November 2025.

United States. Department of Transportation. Federal Highway Administration. Office of Operations "National Travel Time Dashboard: Interstate Highways, November 2025" (2025)

United States. Department of Transportation. Federal Highway Administration. Office of Operations "National Travel Time Dashboard: Interstate Highways, November 2025" , 2025
Export RIS Citation Information. TY - Statistical Report A2 - United States. Department of Transportation. Federal Highway Administration. Office of Operations AB - The Monthly Urban Congestion Report (UCR) provides a state-level overview of traffic congestion and reliability trends on Interstate highways. Published every month, the report compares data from the most recent month with the same month in the previous year. It uses travel time data from the Federal Highway Administration's National Performance Management Research Data Set (NPMRDS) and traffic volume data from the Highway Performance Monitoring System (HPMS). The report includes Interstate highway data from all 50 U.S. states and the District of Columbia. AN - dot:93137 KW - Traffic congestion KW - Travel time KW - Traffic volume KW - Urban transportation KW - Statistical reliability KW - Data collection KW - Data analysis LA - English PB - United States. Department of Transportation. Federal Highway Administration. Office of Operations PY - 2025-11-01 T2 - National Travel Time Dashboard: Interstate Highways TI - National Travel Time Dashboard: Interstate Highways, November 2025 M3 - Statistical Report N1 - United States N1 - Public Domain UR - https://rosap.ntl.bts.gov/view/dot/93137 ER - DB - ROSA P
National Travel Time Dashboard: Interstate Highways, October 2025

United States. Department of Transportation. Federal Highway Administration. Office of Operations

2025-10-01 | National Travel Time Dashboard: Interstate Highways | PDF

The Monthly Urban Congestion Report (UCR) provides a state-level overview of traffic congestion and reliability trends on Interstate highways. Published every month, the report compares data from the most recent month with the same month in the previous year. It uses travel time data from the Federal Highway Administration's National Performance Ma ...

08/24/2026

Title : National Travel Time Dashboard: Interstate Highways, October 2025 Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration. Office of Operations Published Date : 2025-10-01 Series : National Travel Time Dashboard: Interstate Highways URL : https://rosap.ntl.bts.gov/view/dot/93136
United States. Department of Transportation. Federal Highway Administration. Office of Operations (2025). National Travel Time Dashboard: Interstate Highways, October 2025.

United States. Department of Transportation. Federal Highway Administration. Office of Operations "National Travel Time Dashboard: Interstate Highways, October 2025" (2025)

United States. Department of Transportation. Federal Highway Administration. Office of Operations "National Travel Time Dashboard: Interstate Highways, October 2025" , 2025
Export RIS Citation Information. TY - Statistical Report A2 - United States. Department of Transportation. Federal Highway Administration. Office of Operations AB - The Monthly Urban Congestion Report (UCR) provides a state-level overview of traffic congestion and reliability trends on Interstate highways. Published every month, the report compares data from the most recent month with the same month in the previous year. It uses travel time data from the Federal Highway Administration's National Performance Management Research Data Set (NPMRDS) and traffic volume data from the Highway Performance Monitoring System (HPMS). The report includes Interstate highway data from all 50 U.S. states and the District of Columbia. AN - dot:93136 KW - Traffic congestion KW - Travel time KW - Traffic volume KW - Urban transportation KW - Statistical reliability KW - Data collection KW - Data analysis LA - English PB - United States. Department of Transportation. Federal Highway Administration. Office of Operations PY - 2025-10-01 T2 - National Travel Time Dashboard: Interstate Highways TI - National Travel Time Dashboard: Interstate Highways, October 2025 M3 - Statistical Report N1 - United States N1 - Public Domain UR - https://rosap.ntl.bts.gov/view/dot/93136 ER - DB - ROSA P
National Travel Time Dashboard: Interstate Highways, September 2025

United States. Department of Transportation. Federal Highway Administration. Office of Operations

2025-09-01 | National Travel Time Dashboard: Interstate Highways | PDF

The Monthly Urban Congestion Report (UCR) provides a state-level overview of traffic congestion and reliability trends on Interstate highways. Published every month, the report compares data from the most recent month with the same month in the previous year. It uses travel time data from the Federal Highway Administration's National Performance Ma ...

08/24/2026

Title : National Travel Time Dashboard: Interstate Highways, September 2025 Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration. Office of Operations Published Date : 2025-09-01 Series : National Travel Time Dashboard: Interstate Highways URL : https://rosap.ntl.bts.gov/view/dot/93135
United States. Department of Transportation. Federal Highway Administration. Office of Operations (2025). National Travel Time Dashboard: Interstate Highways, September 2025.

United States. Department of Transportation. Federal Highway Administration. Office of Operations "National Travel Time Dashboard: Interstate Highways, September 2025" (2025)

United States. Department of Transportation. Federal Highway Administration. Office of Operations "National Travel Time Dashboard: Interstate Highways, September 2025" , 2025
Export RIS Citation Information. TY - Statistical Report A2 - United States. Department of Transportation. Federal Highway Administration. Office of Operations AB - The Monthly Urban Congestion Report (UCR) provides a state-level overview of traffic congestion and reliability trends on Interstate highways. Published every month, the report compares data from the most recent month with the same month in the previous year. It uses travel time data from the Federal Highway Administration's National Performance Management Research Data Set (NPMRDS) and traffic volume data from the Highway Performance Monitoring System (HPMS). The report includes Interstate highway data from all 50 U.S. states and the District of Columbia. AN - dot:93135 KW - Traffic congestion KW - Travel time KW - Traffic volume KW - Urban transportation KW - Statistical reliability KW - Data collection KW - Data analysis LA - English PB - United States. Department of Transportation. Federal Highway Administration. Office of Operations PY - 2025-09-01 T2 - National Travel Time Dashboard: Interstate Highways TI - National Travel Time Dashboard: Interstate Highways, September 2025 M3 - Statistical Report N1 - United States N1 - Public Domain UR - https://rosap.ntl.bts.gov/view/dot/93135 ER - DB - ROSA P
Special Issue - Weekly Motor Fuel Report: Gasoline Product Supplied for Fiscal Year Week No. 46, Data Complete Through 8/14/2026

United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information

2026-08-19 | Special Issue - Weekly Motor Fuel Report | PDF

The Gasoline Product Supplied report offers insight on weekly fluctuation of the gasoline product supply, which is an important part of any analysis of construction trends, materials and operating costs associated with highway repair and construction, and changes in traffic volume. These data come directly from the Energy Information Administration ...

08/24/2026

Title : Special Issue - Weekly Motor Fuel Report: Gasoline Product Supplied for Fiscal Year Week No. 46, Data Complete Through 8/14/2026 Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information Published Date : 2026-08-19 Series : Special Issue - Weekly Motor Fuel Report URL : https://rosap.ntl.bts.gov/view/dot/93134
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information (2026). Special Issue - Weekly Motor Fuel Report: Gasoline Product Supplied for Fiscal Year Week No. 46, Data Complete Through 8/14/2026.

United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information "Special Issue - Weekly Motor Fuel Report: Gasoline Product Supplied for Fiscal Year Week No. 46, Data Complete Through 8/14/2026" (2026)

United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information "Special Issue - Weekly Motor Fuel Report: Gasoline Product Supplied for Fiscal Year Week No. 46, Data Complete Through 8/14/2026" , 2026
Export RIS Citation Information. TY - Statistical Report A2 - United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information AB - The Gasoline Product Supplied report offers insight on weekly fluctuation of the gasoline product supply, which is an important part of any analysis of construction trends, materials and operating costs associated with highway repair and construction, and changes in traffic volume. These data come directly from the Energy Information Administration (EIA) website. The EIA publishes the average daily amount of gasoline supplied in barrels, which HPPI converts to an average number of gallons of gasoline per week. AN - dot:93134 KW - Fuel consumption KW - Gasoline KW - Supply KW - Traffic volume KW - Data collection KW - Data analysis LA - English PB - United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information PY - 2026-08-19 T2 - Special Issue - Weekly Motor Fuel Report TI - Special Issue - Weekly Motor Fuel Report: Gasoline Product Supplied for Fiscal Year Week No. 46, Data Complete Through 8/14/2026 M3 - Statistical Report N1 - United States N1 - Public Domain UR - https://rosap.ntl.bts.gov/view/dot/93134 ER - DB - ROSA P
Flowfill and MSE Bridge Approaches: Performance, Cost, and Recommendations for Improvements

Abu-Hejleh, Naser ;

Hanneman, Dennis

2006-02-01 | PDF

Construction of a typical Colorado DOT (CDOT) bridge approach structure includes placement of a high quality backfill material behind the abutment wall, and installation of a concrete approach slab supported by the bridge abutment wall at one end and the sleeper slab foundation at the roadway end. Since 1992, three new alternatives for the abutment ...

08/24/2026

Title : Flowfill and MSE Bridge Approaches: Performance, Cost, and Recommendations for Improvements Creator(s) : Abu-Hejleh, Naser;Hanneman, Dennis;White, David J.;Wang, Trever;Ksouri, Ilyess; Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 2006-02-01 Report Number : CDOT-DTD-R-2006-2 URL : https://rosap.ntl.bts.gov/view/dot/93133
Abu-Hejleh, Naser et al. (2006). Flowfill and MSE Bridge Approaches: Performance, Cost, and Recommendations for Improvements.

Abu-Hejleh, Naser et al. "Flowfill and MSE Bridge Approaches: Performance, Cost, and Recommendations for Improvements" (2006)

Abu-Hejleh, Naser et al. "Flowfill and MSE Bridge Approaches: Performance, Cost, and Recommendations for Improvements" , 2006
Export RIS Citation Information. TY - Tech Report AU - Abu-Hejleh, Naser AU - Hanneman, Dennis AU - White, David J. AU - Wang, Trever AU - Ksouri, Ilyess A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - Construction of a typical Colorado DOT (CDOT) bridge approach structure includes placement of a high quality backfill material behind the abutment wall, and installation of a concrete approach slab supported by the bridge abutment wall at one end and the sleeper slab foundation at the roadway end. Since 1992, three new alternatives for the abutment backfill have been employed by CDOT: (1) relatively expensive flowfill; (2) lower cost mechanically stabilized earth (MSE) using granular, well-graded Class-1 Backfill, and (3) MSE using free draining Class B Filter soil. However, bridge bump problems at the sleeper slab are still occurring. In the Founders/Meadows bridge structure, both the bridge footings and approaches are supported by geosynthetic reinforced soil (GRS) walls to minimize the uneven settlements between the bridge and its approaches (called "GRS Abutment"). Since this structure is unique, performance data from gauges embedded in the approaches and from smoothness tests were collected over five years. The objective of this study is to improve CDOT's current practice for bridge approaches (improve performance and reduce costs) based on the following information obtained in this study: 1) comments and suggestions collected from CDOT Staff and reported in the literature; 2) performance and cost-effectiveness of CDOT's MSE and flowfill bridge approaches and performance and design assessment of the Founders/Meadows GRS approaches; and 3) causes and sources of the bridge approach settlement problems observed in some of CDOT's MSE and flowfill bridge approaches. AN - dot:93133 KW - Speed control humps KW - Slabs KW - Abutments KW - Backfill soils KW - Cost effectiveness KW - Drainage KW - Construction KW - Repairing KW - Inspection KW - Foundations KW - Embankments KW - Expansion KW - Walls KW - Mechanically stabilized earth KW - Data analysis KW - bumps KW - approach slabs KW - settlement KW - sleeper slabs KW - expansion devices LA - English PB - Colorado. Department of Transportation PY - 2006-02-01 SN - CDOT-DTD-R-2006-2 TI - Flowfill and MSE Bridge Approaches: Performance, Cost, and Recommendations for Improvements M3 - Tech Report N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/93133 ER - DB - ROSA P
Study on Application of Simulator-based Training and Assessment for Sea Service Equivalence

Fisher, Donald L.

;

Zuschlag, Michael

2025-06-21 | PDF

The Volpe National Transportation Systems Center was asked to undertake two related tasks, ultimately with the goal of increasing the pool of mariners seeking an endorsement. (1) In the first task, Volpe was asked to evaluate current sea service requirements and support evidence-based recommendations for granting sea service equivalencies for train ...

08/24/2026

Title : Study on Application of Simulator-based Training and Assessment for Sea Service Equivalence Creator(s) : Fisher, Donald L.;Zuschlag, Michael;Sparko, Andrea L.;Calabrese, Clark; Corporate Creator(s) : John A. Volpe National Transportation Systems Center (U.S.);United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology; Corporate Contributor(s) : United States. Coast Guard Published Date : 2025-06-21 Report Number : DOT-VNTSC-USCG-26-01 URL : https://rosap.ntl.bts.gov/view/dot/93132
Fisher, Donald L. et al. (2025). Study on Application of Simulator-based Training and Assessment for Sea Service Equivalence.

Fisher, Donald L. et al. "Study on Application of Simulator-based Training and Assessment for Sea Service Equivalence" (2025)

Fisher, Donald L. et al. "Study on Application of Simulator-based Training and Assessment for Sea Service Equivalence" , 2025
Export RIS Citation Information. TY - Tech Report AU - Fisher, Donald L. AU - Zuschlag, Michael AU - Sparko, Andrea L. AU - Calabrese, Clark A2 - John A. Volpe National Transportation Systems Center (U.S.) A2 - United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology A3 - United States. Coast Guard AB - The Volpe National Transportation Systems Center was asked to undertake two related tasks, ultimately with the goal of increasing the pool of mariners seeking an endorsement. (1) In the first task, Volpe was asked to evaluate current sea service requirements and support evidence-based recommendations for granting sea service equivalencies for training and assessment of Navigation and Vessel Inspection Circular (NVIC) tasks learned and assessed using one of five methods: training first at sea either on or not on a training vessel and training first on land either without a simulator, with a part-task simulator, or with a full-mission simulator. Subject matter experts' (SMEs') estimates of the time to reach proficiency at sea on each NIVC task trained using a given method were obtained for each of six Standards of Training, Certification, and Watchkeeping (STCW) endorsements: Ratings Forming Part of a Navigational Watch (RFPNW), Ratings Forming Part of an Engineering Watch (RFPEW), Officer in Charge of Navigational Watch (OICNW), Officer in Charge of Engineering Watch (OICEW), Master/Chief Mate, and Chief Engineer/2nd Engineer Officer. A total of 2,163 SME such estimates of the time to reach proficiency were obtained. Based on these estimates, a rule was developed by the Volpe Center that was used to infer sea service equivalence from the time to proficiency for the tasks included in the NVICs that were required for each of the six STCW endorsements. These task estimates can then be used to determine for an individual mariner the overall sea service equivalency for any subset of tasks on which the mariner has been trained. (2) In the second task, Volpe was asked to determine which of two methods of training mariners was most effective. Comparisons were made between the performance of mariners in courses involving full-mission versus part-task simulator training, one versus multiple trainees per simulator, and initial versus recertification training within Radar Observer. No statistically significant differences in performance were observed in any comparison. This suggest that mariners can take a course taught using a method that they believe is best suited to their learning results. AN - dot:93132 ET - Final Report KW - Simulation KW - Marine transportation KW - Education and training LA - English PB - John A. Volpe National Transportation Systems Center (U.S.) PY - 2025-06-21 SN - DOT-VNTSC-USCG-26-01 TI - Study on Application of Simulator-based Training and Assessment for Sea Service Equivalence M3 - Tech Report N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/93132 ER - DB - ROSA P
Pavement Temperature Monitoring and Modeling at ICART

Hajj, Ramez

;

Morales, Fernanda Marquez

2026-08-01 | PDF

Hot-mix asphalt is a viscoelastic material with properties that depend heavily on temperature and loading frequency. Consequently, precise pavement temperature monitoring is critical for accurate pavement analysis, modulus backcalculation, and prediction of critical pavement responses. Recent Illinois Center for Transportation and Illinois Departme ...

08/24/2026

Title : Pavement Temperature Monitoring and Modeling at ICART Creator(s) : Hajj, Ramez;Morales, Fernanda Marquez; Corporate Creator(s) : Illinois Center for Transportation;University of Illinois at Urbana-Champaign; Corporate Contributor(s) : Illinois. Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-08-01 Report Number : FHWA-ICT-26-012;ICT-26-014;UILU-2026-2014; DOI : https://doi.org/10.36501/0197-9191/26-014
Hajj, Ramez and Morales, Fernanda Marquez (2026). Pavement Temperature Monitoring and Modeling at ICART. https://doi.org/10.36501/0197-9191/26-014

Hajj, Ramez and Morales, Fernanda Marquez "Pavement Temperature Monitoring and Modeling at ICART" (2026), https://doi.org/10.36501/0197-9191/26-014

Hajj, Ramez and Morales, Fernanda Marquez "Pavement Temperature Monitoring and Modeling at ICART" , 2026, https://doi.org/10.36501/0197-9191/26-014
Export RIS Citation Information. TY - Tech Report AU - Hajj, Ramez AU - Morales, Fernanda Marquez A2 - Illinois Center for Transportation A2 - University of Illinois at Urbana-Champaign A3 - Illinois. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - Hot-mix asphalt is a viscoelastic material with properties that depend heavily on temperature and loading frequency. Consequently, precise pavement temperature monitoring is critical for accurate pavement analysis, modulus backcalculation, and prediction of critical pavement responses. Recent Illinois Center for Transportation and Illinois Department of Transportation projects analyzed traffic speed deflectometer (TSD) data across Illinois highways. Unlike traditional falling weight deflectometer measurements, TSD testing occurs at traffic speeds, preventing the collection of multiple temperature readings. To overcome this limitation, a more robust method is required to approximate internal pavement temperatures based on surface conditions. In this project, the research team created and piloted a laboratory prototype device using an instrumented field core embedded with temperature sensors. A MATLAB tool was developed to support future data input, validate measurements against existing models, and develop new models. The new prototype will be deployed at the Illinois Certification and Research Track (ICART) alongside a weather station to gather continuous temperature data. The report also presents a framework for using the prototype and future ICART data to validate TSD data in a future project. AN - dot:93131 DO - https://doi.org/10.36501/0197-9191/26-014 ET - Final Report: 6/1/25-8/31/26 KW - Pavement tests KW - Thermal degradation KW - Traffic speed KW - Deflectometers KW - Data analysis KW - Testing KW - Temperature sensors KW - Backcalculation KW - Monitoring KW - Traffic Speed Deflectometer LA - English PB - Illinois Center for Transportation PY - 2026-08-01 SN - FHWA-ICT-26-012 TI - Pavement Temperature Monitoring and Modeling at ICART M3 - Tech Report N1 - United States N1 - R27-SP75 UR - https://rosap.ntl.bts.gov/view/dot/93131 ER - DB - ROSA P
State-of-Technology Review-Autonomous Ground Vehicle Systems in Airport Environments

Woltmann, Sarah ;

Rybski, Paul

2026-08-01 | PDF

As airports increasingly explore autonomous ground vehicle system technology (AGVS) to enhance operational efficiency and safety, the integration, validation, and regulatory compliance of those systems pose challenges. The adoption of AGVSs within airport environments-both nationally and internationally-has accelerated due to growing demands for ef ...

08/24/2026

Title : State-of-Technology Review-Autonomous Ground Vehicle Systems in Airport Environments Creator(s) : Woltmann, Sarah;Rybski, Paul;Becicka, Troy;Breen, Joe;Thompson, Kent;Ackermann, Adam;Schaffer, Logan;Hull, Luke;Hubbard, Sarah; Corporate Creator(s) : Applied Research Associates, Inc.;Woolpert, Inc;Purdue University; Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Office of Airports Safety and Standards Published Date : 2026-08-01 Report Number : DOT/FAA/TC-26/21 DOI : https://doi.org/10.21949/98m5-s691
Woltmann, Sarah et al. (2026). State-of-Technology Review-Autonomous Ground Vehicle Systems in Airport Environments. https://doi.org/10.21949/98m5-s691

Woltmann, Sarah et al. "State-of-Technology Review-Autonomous Ground Vehicle Systems in Airport Environments" (2026), https://doi.org/10.21949/98m5-s691

Woltmann, Sarah et al. "State-of-Technology Review-Autonomous Ground Vehicle Systems in Airport Environments" , 2026, https://doi.org/10.21949/98m5-s691
Export RIS Citation Information. TY - Tech Report AU - Woltmann, Sarah AU - Rybski, Paul AU - Becicka, Troy AU - Breen, Joe AU - Thompson, Kent AU - Ackermann, Adam AU - Schaffer, Logan AU - Hull, Luke AU - Hubbard, Sarah A2 - Applied Research Associates, Inc. A2 - Woolpert, Inc A2 - Purdue University A3 - United States. Department of Transportation. Federal Aviation Administration. Office of Airports Safety and Standards A4 - Vitagliano, Lauren AB - As airports increasingly explore autonomous ground vehicle system technology (AGVS) to enhance operational efficiency and safety, the integration, validation, and regulatory compliance of those systems pose challenges. The adoption of AGVSs within airport environments-both nationally and internationally-has accelerated due to growing demands for efficiency and automation. Airports have begun testing AGVSs across various functions, including self-driving jet bridges, aircraft tugs, baggage carts, deicing vehicles, employee shuttles, mowers, foreign object debris collection, and perimeter inspections. While non-movement areas provide controlled conditions for AGVS experimentation, the movement area presents greater challenges due to high-speed aircraft operations and strict regulatory oversight. AB - This state-of-technology assessment includes a literature review and outreach effort that were conducted to provide insights from industry stakeholders into the current state of AGVS technology in areas that may be beneficial for airport use. The literature review and outreach efforts aided in identifying existing standards, test approaches, and risk mitigations from currently implemented AGVS solutions. This report summarizes and synthesizes the key facts of these efforts. The research team conducted virtual discussions with representatives from airports and other entities involved with AGVS use at airports to document their experiences and perspectives on AGVS integration at airports. AB - These research findings identified key challenges associated with navigating complex airfield environments, interoperability with existing airport systems, and the impact of radio frequency interference with AGVS operations. Despite these challenges, the findings demonstrate that AGVS testing within airport environments can be successfully conducted, highlighting the technology's potential to significantly enhance operational efficiency and safety. AN - dot:93130 DO - https://doi.org/10.21949/98m5-s691 ET - Final Report KW - Autonomous vehicles KW - Ground vehicles KW - State of the practice KW - Airports LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 2026-08-01 SN - DOT/FAA/TC-26/21 TI - State-of-Technology Review-Autonomous Ground Vehicle Systems in Airport Environments M3 - Tech Report N1 - United States N1 - 692M15-22-D-00004, 692M15-24-F-00027 UR - https://rosap.ntl.bts.gov/view/dot/93130 ER - DB - ROSA P
Life Cycle Costing

Anderson, Phil

2006-02-01 | PDF

The research project was initiated by the Colorado Department of Transportation (CDOT) to develop guidelines for determining the long-term costs of adding additional capacity and other related transportation improvements to the state highway and bridge system. Future costs, including ongoing maintenance, rehabilitation, and replacement costs have n ...

08/24/2026

Title : Life Cycle Costing Creator(s) : Anderson, Phil Corporate Creator(s) : URS Corporation Corporate Contributor(s) : Colorado. Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 2006-02-01 Report Number : CDOT-DTD-R-2006-3 URL : https://rosap.ntl.bts.gov/view/dot/93129
Anderson, Phil (2006). Life Cycle Costing.

Anderson, Phil "Life Cycle Costing" (2006)

Anderson, Phil "Life Cycle Costing" , 2006
Export RIS Citation Information. TY - Tech Report AU - Anderson, Phil A2 - URS Corporation A3 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - The research project was initiated by the Colorado Department of Transportation (CDOT) to develop guidelines for determining the long-term costs of adding additional capacity and other related transportation improvements to the state highway and bridge system. Future costs, including ongoing maintenance, rehabilitation, and replacement costs have not been traditionally considered when a project is advanced. At the planning level this project allows for CDOT to estimate the future cost of adding capacity to the transportation system and to assess the impacts that transportation related projects will have on future year budgets In completing the project a methodology was proposed that would capture the incremental increase in long-term project costs associated with adding additional capacity to the system. Incremental costs were defined as not only geometric increases, but also include such things as roadway and bridge maintenance, ITS deployment and maintenance, and roadway and bridge rehabilitation. Incremental costs were identified as long-term projects costs that CDOT would have to account for in future budgets. As anticipated, research results reflect that long-term project costs associated with capacity improvements to the state transportation system will require additional financial resources in future years. AN - dot:93129 ET - Final Report KW - Investments KW - Bridges KW - Budgeting KW - Costs KW - Guidelines KW - Highway capacity KW - Improvements KW - Intelligent transportation systems KW - Life cycle costing KW - Maintenance KW - Rehabilitation KW - State highways KW - Transportation KW - transportation investments LA - English PB - Colorado. Department of Transportation PY - 2006-02-01 SN - CDOT-DTD-R-2006-3 TI - Life Cycle Costing M3 - Tech Report N1 - United States N1 - PG HAA 05HQ221 UR - https://rosap.ntl.bts.gov/view/dot/93129 ER - DB - ROSA P
Implementation of Proven PCCP Practices in Colorado

Ardani, Ahmad

2006-04-01 | PDF

This paper is an overview of the proven concrete pavement practices that the Colorado Department of Transportation (CDOT) has implemented over the last several years. These include implementation of the following practices: (1) Implementation of Longitudinal Tining: Nine test sections were constructed on I-70 near Denver, Colorado with varying text ...

08/24/2026

Title : Implementation of Proven PCCP Practices in Colorado Creator(s) : Ardani, Ahmad Corporate Creator(s) : Colorado. Department of Transportation Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 2006-04-01 Report Number : CDOT-DTD-R-2006-9 URL : https://rosap.ntl.bts.gov/view/dot/93128
Ardani, Ahmad (2006). Implementation of Proven PCCP Practices in Colorado.

Ardani, Ahmad "Implementation of Proven PCCP Practices in Colorado" (2006)

Ardani, Ahmad "Implementation of Proven PCCP Practices in Colorado" , 2006
Export RIS Citation Information. TY - Tech Report AU - Ardani, Ahmad A2 - Colorado. Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - This paper is an overview of the proven concrete pavement practices that the Colorado Department of Transportation (CDOT) has implemented over the last several years. These include implementation of the following practices: (1) Implementation of Longitudinal Tining: Nine test sections were constructed on I-70 near Denver, Colorado with varying textural characteristics. Texture depth, skid numbers at different speeds, and their noise properties were measured. Based on the finding of this research study CDOT adopted the longitudinal tining (uniformly spaced ¾ in.) as a preferred method of texturing concrete pavements in 1997. Longitudinally tined portland cement concrete pavement (PCCP) exhibits low noise levels and provides adequate friction. (2) Implementation of the Wider Slab, SPS-2 Experiment Spin-Off Product: This experiment dealt with various structural factors in concrete, one of which was the wider slab (14-ft slab). The results of this study revealed that 2 ft of widening was adequate. Structurally speaking, their contributions were found to be equivalent to 1 in. of slab thickness. (3) Implementation of Single-Cut Joints, SPS-4 Experiment Spin-Off Product: The results of this study revealed that the single cut (1/8 in. joints) were as effective as CDOT's standard double cut (3/8 in. joints). The only difference was that the narrower joints were less labor-intensive and required much less sealant material. Based on a cost-benefit analysis, a saving of 57 cents per linear foot of joint was realized, which equates to approximately 1.7 million dollars per 100 miles of 2-lane concrete pavement. (4) Addressing Premature PCCP Longitudinal Cracking: This experiment presents an evaluation of several PCCP with premature longitudinal cracking. All of the locations discussed are in Region 1 of the CDOT. This study resulted in 2 new specifications: 1- Requiring the engineer to measure saw-cut depth at intervals of 1 per 1/10 of a mile (528 ft); and 2- Requiring paving contractors to equip their paving machines with vibrator monitoring devices. AN - dot:93128 ET - Final Report KW - Benefit cost analysis KW - Best practices KW - Concrete pavements KW - Implementation KW - Longitudinal cracking KW - Pavement grooving KW - Pavement joints KW - Pavement widening KW - Slabs KW - Specifications KW - Texture KW - Portland cement concrete KW - longitudinal tining KW - 14-foot slabs KW - narrow joints KW - longitudinal cracking LA - English PB - Colorado. Department of Transportation PY - 2006-04-01 SN - CDOT-DTD-R-2006-9 TI - Implementation of Proven PCCP Practices in Colorado M3 - Tech Report N1 - United States UR - https://rosap.ntl.bts.gov/view/dot/93128 ER - DB - ROSA P

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