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Showing 461 - 480 of 501 results

Approval of the Use of Structural Design Standards [Memorandum]

Everett, Thomas D.

2022-04-11 | Memoranda & Guidance: Information | PDF

The American Association of State Highway and Transportation Officials (AASHTO) and the American Welding Society (AWS) have published new editions of design standards incorporated by reference at 23 CFR 625.4(d).

08/03/2026

Title : Approval of the Use of Structural Design Standards [Memorandum] Creator(s) : Everett, Thomas D. Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration Corporate Contributor(s) : United States. Department of Transportation. Federal Highway Policy & Guidance Center Published Date : 2022-04-11 Series : Memoranda & Guidance: Information URL : https://rosap.ntl.bts.gov/view/dot/92759
Everett, T. D. (2022). Approval of the Use of Structural Design Standards [Memorandum]. United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/92759

Everett, Thomas D.. Approval of the Use of Structural Design Standards [Memorandum]. United States. Department of Transportation. Federal Highway Administration, 2022. https://rosap.ntl.bts.gov/view/dot/92759.

Everett, Thomas D. Approval of the Use of Structural Design Standards [Memorandum]. United States. Department of Transportation. Federal Highway Administration, 2022, ROSA P. https://rosap.ntl.bts.gov/view/dot/92759.
Export RIS Citation Information. TY - Memorandum AU - Everett, Thomas D. A2 - United States. Department of Transportation. Federal Highway Administration A3 - United States. Department of Transportation. Federal Highway Policy & Guidance Center AB - The American Association of State Highway and Transportation Officials (AASHTO) and the American Welding Society (AWS) have published new editions of design standards incorporated by reference at 23 CFR 625.4(d). AN - dot:92759 DA - 2022-04-11 KW - Policy KW - Recommendations KW - Standards KW - Bridge design KW - Welding LA - English PB - United States. Department of Transportation. Federal Highway Administration PY - 2022 T2 - Memoranda & Guidance: Information TI - Approval of the Use of Structural Design Standards [Memorandum] M3 - Memorandum N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92759 ER -
Freight Analysis Framework (FAF) FAF6 [supporting datasets]

United States. Department of Transportation. Office of the Secretary of Transportation ...

2026-07-31 | Freight Analysis Framework (FAF) | JSON

The Freight Analysis Framework (FAF) creates a comprehensive picture of freight movement among states and major metropolitan areas by all modes of transportation. The FAF integrates data from a variety of sources. Starting with data from the Commodity Flow Survey (CFS) and international trade data from the Census Bureau, FAF incorporates data from ...

08/03/2026

Supporting Files

Title : Freight Analysis Framework (FAF) FAF6 [supporting datasets] Corporate Creator(s) : United States. Department of Transportation. Office of the Secretary of Transportation;United States. Department of Transportation. Bureau of Transportation Statistics. Office of Statistical and Economic Analysis; Published Date : 2026-07-31 Series : Freight Analysis Framework (FAF) DOI : https://doi.org/10.21949/fhgm-g335
United States. Department of Transportation. Office of the Secretary of Transportation, & United States. Department of Transportation. Bureau of Transportation Statistics. Office of Statistical and Economic Analysis (2026). Freight Analysis Framework (FAF) FAF6 [supporting datasets]. United States. Department of Transportation. Bureau of Transportation Statistics. https://doi.org/10.21949/fhgm-g335

United States. Department of Transportation. Office of the Secretary of Transportation and United States. Department of Transportation. Bureau of Transportation Statistics. Office of Statistical and Economic Analysis. Freight Analysis Framework (FAF) FAF6 [supporting datasets]. United States. Department of Transportation. Bureau of Transportation Statistics, 2026. https://doi.org/10.21949/fhgm-g335.

United States. Department of Transportation. Office of the Secretary of Transportation, et al. Freight Analysis Framework (FAF) FAF6 [supporting datasets]. United States. Department of Transportation. Bureau of Transportation Statistics, 2026, ROSA P. https://doi.org/10.21949/fhgm-g335.
Export RIS Citation Information. TY - Dataset A2 - United States. Department of Transportation. Office of the Secretary of Transportation A2 - United States. Department of Transportation. Bureau of Transportation Statistics. Office of Statistical and Economic Analysis AB - The Freight Analysis Framework (FAF) creates a comprehensive picture of freight movement among states and major metropolitan areas by all modes of transportation. The FAF integrates data from a variety of sources. Starting with data from the Commodity Flow Survey (CFS) and international trade data from the Census Bureau, FAF incorporates data from agriculture, extraction, utility, construction, service, and other sectors. The FAF6 Regional Database of tonnage and value by FAF regions of origin and destination, commodity type, and mode, benchmarked to the 2022 Commodity Flow Survey is available. Weights are in thousands of tons and values are in millions of 2022 constant dollars. AB - Files are available for download in .csv and MS Access formats on https://www.bts.gov/faf. An online Data Tabulation Tool (DTT), which uses the FAF data to create tabular summaries and visualizations for users, is also provided. AN - dot:92758 DA - 2026-07-31 DO - https://doi.org/10.21949/fhgm-g335 KW - Data KW - Statistics KW - Transportation modes KW - Freight transportation KW - Statistical analysis KW - Multimodal transportation KW - Freight traffic KW - Freight handling KW - Freight Analysis Framework KW - FAF LA - English PB - United States. Department of Transportation. Bureau of Transportation Statistics PY - 2026 T2 - Freight Analysis Framework (FAF) TI - Freight Analysis Framework (FAF) FAF6 [supporting datasets] M3 - Dataset N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92758 ER -
Investigation of the Lane-Wells Road Logger

McDonald, Tom

1966-09-01 | PDF

The Lane-Wells Road Logger was utilized primarily to determine the feasibility of employing such a device for moisture and density control in Iowa highway construction. A secondary objective was the use of the Road Logger to obtain information concerning moisture content and density during and after construction.

08/03/2026

Title : Investigation of the Lane-Wells Road Logger Creator(s) : McDonald, Tom Corporate Creator(s) : Iowa Highway Research Board Corporate Contributor(s) : Iowa State Highway Commission Published Date : 1966-09-01 URL : https://rosap.ntl.bts.gov/view/dot/92757
McDonald, T. (1966). Investigation of the Lane-Wells Road Logger. Iowa State Highway Commission. https://rosap.ntl.bts.gov/view/dot/92757

McDonald, Tom. Investigation of the Lane-Wells Road Logger. Iowa State Highway Commission, 1966. https://rosap.ntl.bts.gov/view/dot/92757.

McDonald, Tom Investigation of the Lane-Wells Road Logger. Iowa State Highway Commission, 1966, ROSA P. https://rosap.ntl.bts.gov/view/dot/92757.
Export RIS Citation Information. TY - Tech Report AU - McDonald, Tom A2 - Iowa Highway Research Board A3 - Iowa State Highway Commission AB - The Lane-Wells Road Logger was utilized primarily to determine the feasibility of employing such a device for moisture and density control in Iowa highway construction. A secondary objective was the use of the Road Logger to obtain information concerning moisture content and density during and after construction. AN - dot:92757 DA - 1966-09-01 KW - Logging roads KW - Field tests KW - Evaluation KW - Travel KW - Interstate transportation KW - Road construction KW - Moisture content LA - English PB - Iowa State Highway Commission PY - 1966 TI - Investigation of the Lane-Wells Road Logger M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92757 ER -
Dignity by Design: Public Restrooms as Essential Transportation Infrastructure [Public Policy]

Mata, Stacy

2026-07-01 | PDF

In the absence of an established mobility hub audit framework, this study developed a prospective audit methodology to evaluate prospective hub locations. Structured site visits documented multimodal transportation connections, amenities, accessibility features, and user supportive infrastructure, including shade, seating, drinking water, public re ...

08/03/2026

Title : Dignity by Design: Public Restrooms as Essential Transportation Infrastructure [Public Policy] Creator(s) : Mata, Stacy Corporate Creator(s) : University of California, Los Angeles. Lewis Center for Regional Policy Studies Published Date : 2026-07-01 URL : https://rosap.ntl.bts.gov/view/dot/92756
Mata, S. (2026). Dignity by Design: Public Restrooms as Essential Transportation Infrastructure [Public Policy]. University of California, Los Angeles. Lewis Center for Regional Policy Studies. https://rosap.ntl.bts.gov/view/dot/92756

Mata, Stacy. Dignity by Design: Public Restrooms as Essential Transportation Infrastructure [Public Policy]. University of California, Los Angeles. Lewis Center for Regional Policy Studies, 2026. https://rosap.ntl.bts.gov/view/dot/92756.

Mata, Stacy Dignity by Design: Public Restrooms as Essential Transportation Infrastructure [Public Policy]. University of California, Los Angeles. Lewis Center for Regional Policy Studies, 2026, ROSA P. https://rosap.ntl.bts.gov/view/dot/92756.
Export RIS Citation Information. TY - Brief AU - Mata, Stacy A2 - University of California, Los Angeles. Lewis Center for Regional Policy Studies AB - In the absence of an established mobility hub audit framework, this study developed a prospective audit methodology to evaluate prospective hub locations. Structured site visits documented multimodal transportation connections, amenities, accessibility features, and user supportive infrastructure, including shade, seating, drinking water, public restrooms, lighting and wayfinding. Observational analysis of movement patterns, modal transfers and site activity supplemented the inventory, providing a comprehensive assessment of each location's functionality, user experience and readiness to serve as a mobility hub. Audits were used to identify opportunities to improve accessibility, safety, comfort, and multimodal integration. AN - dot:92756 DA - 2026-07-01 ET - Policy Brief KW - Roadside rest areas KW - Infrastructure KW - Mobility KW - Federal government agencies KW - Persons with disabilities KW - Transportation equity KW - Pedestrians KW - Homeless persons KW - Vulnerable road users KW - Multimodal transportation KW - Accessibility LA - English PB - University of California, Los Angeles. Lewis Center for Regional Policy Studies PY - 2026 TI - Dignity by Design: Public Restrooms as Essential Transportation Infrastructure [Public Policy] M3 - Brief N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92756 ER -
25 Most Traveled Route Locations by Annual Average Daily Traffic (AADT)

United States. Department of Transportation. Federal Highway Administration

2026-07-08 | PDF

This fact sheet contains information about annual average daily traffic and how it's changed over time.

08/03/2026

Title : 25 Most Traveled Route Locations by Annual Average Daily Traffic (AADT) Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration Published Date : 2026-07-08 URL : https://rosap.ntl.bts.gov/view/dot/92755
United States. Department of Transportation. Federal Highway Administration (2026). 25 Most Traveled Route Locations by Annual Average Daily Traffic (AADT). United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/92755

United States. Department of Transportation. Federal Highway Administration. 25 Most Traveled Route Locations by Annual Average Daily Traffic (AADT). United States. Department of Transportation. Federal Highway Administration, 2026. https://rosap.ntl.bts.gov/view/dot/92755.

United States. Department of Transportation. Federal Highway Administration 25 Most Traveled Route Locations by Annual Average Daily Traffic (AADT). United States. Department of Transportation. Federal Highway Administration, 2026, ROSA P. https://rosap.ntl.bts.gov/view/dot/92755.
Export RIS Citation Information. TY - Booklet/Pamphlet A2 - United States. Department of Transportation. Federal Highway Administration AB - This fact sheet contains information about annual average daily traffic and how it's changed over time. AN - dot:92755 DA - 2026-07-08 KW - Annual average daily traffic KW - Traffic volume KW - Interstate highways KW - Average daily traffic LA - English PB - United States. Department of Transportation. Federal Highway Administration PY - 2026 TI - 25 Most Traveled Route Locations by Annual Average Daily Traffic (AADT) M3 - Booklet/Pamphlet N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92755 ER -
Special Issue - Weekly Motor Fuel Report: Gasoline Product Supplied for Fiscal Year Week No. 42, Data Complete Through 7/17/2026

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

2026-07-22 | 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 ...

08/03/2026

Title : Special Issue - Weekly Motor Fuel Report: Gasoline Product Supplied for Fiscal Year Week No. 42, Data Complete Through 7/17/2026 Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information Published Date : 2026-07-22 Series : Special Issue - Weekly Motor Fuel Report URL : https://rosap.ntl.bts.gov/view/dot/92754
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. 42, Data Complete Through 7/17/2026. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information. https://rosap.ntl.bts.gov/view/dot/92754

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. 42, Data Complete Through 7/17/2026. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2026. https://rosap.ntl.bts.gov/view/dot/92754.

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. 42, Data Complete Through 7/17/2026. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2026, ROSA P. https://rosap.ntl.bts.gov/view/dot/92754.
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:92754 DA - 2026-07-22 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 T2 - Special Issue - Weekly Motor Fuel Report TI - Special Issue - Weekly Motor Fuel Report: Gasoline Product Supplied for Fiscal Year Week No. 42, Data Complete Through 7/17/2026 M3 - Statistical Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92754 ER -
Special Issue - Weekly Motor Fuel Report: Gasoline Product Supplied for Fiscal Year Week No. 41, Data Complete Through 7/10/2026

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

2026-07-15 | 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 ...

08/03/2026

Title : Special Issue - Weekly Motor Fuel Report: Gasoline Product Supplied for Fiscal Year Week No. 41, Data Complete Through 7/10/2026 Corporate Creator(s) : United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information Published Date : 2026-07-15 Series : Special Issue - Weekly Motor Fuel Report URL : https://rosap.ntl.bts.gov/view/dot/92753
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. 41, Data Complete Through 7/10/2026. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information. https://rosap.ntl.bts.gov/view/dot/92753

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. 41, Data Complete Through 7/10/2026. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2026. https://rosap.ntl.bts.gov/view/dot/92753.

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. 41, Data Complete Through 7/10/2026. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2026, ROSA P. https://rosap.ntl.bts.gov/view/dot/92753.
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:92753 DA - 2026-07-15 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 T2 - Special Issue - Weekly Motor Fuel Report TI - Special Issue - Weekly Motor Fuel Report: Gasoline Product Supplied for Fiscal Year Week No. 41, Data Complete Through 7/10/2026 M3 - Statistical Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92753 ER -
Automated Lidar Data to Develop and Manage Active Transportation Asset Inventories

Jung, Jaehoon ;

Olsen, Michael J.

2026-07-01 | PDF

Pedestrian crosswalks, bike lanes, and medians are key safety devices in a multi-modal highway network. However, there is no statewide map of these assets' locations and types. Such a map would benefit planning, maintenance, safety assessments, and network analyses for ODOT and its partners. Currently, ODOT collects asset information through site v ...

08/03/2026

Title : Automated Lidar Data to Develop and Manage Active Transportation Asset Inventories Creator(s) : Jung, Jaehoon;Olsen, Michael J.;Che, Erzhuo;Rastiveis, Heidar;Turkan, Yelda;Parrish, Christopher; Corporate Creator(s) : Oregon State University Corporate Contributor(s) : Oregon. Department of Transportation. Research Section;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-07-01 Report Number : FHWA-OR-RD-27-03 URL : https://rosap.ntl.bts.gov/view/dot/92752
Jung, J., Olsen, M. J., Che, E., Rastiveis, H., Turkan, Y., & Parrish, C. (2026). Automated Lidar Data to Develop and Manage Active Transportation Asset Inventories (Report No. FHWA-OR-RD-27-03). Oregon. Department of Transportation. Research Section. https://rosap.ntl.bts.gov/view/dot/92752

Jung, Jaehoon, Michael J. Olsen, Erzhuo Che, Heidar Rastiveis, Yelda Turkan, and Christopher Parrish. Automated Lidar Data to Develop and Manage Active Transportation Asset Inventories. Report no. FHWA-OR-RD-27-03. Oregon. Department of Transportation. Research Section, 2026. https://rosap.ntl.bts.gov/view/dot/92752.

Jung, Jaehoon, et al. Automated Lidar Data to Develop and Manage Active Transportation Asset Inventories. Oregon. Department of Transportation. Research Section, 2026, Report no. FHWA-OR-RD-27-03, ROSA P. https://rosap.ntl.bts.gov/view/dot/92752.
Export RIS Citation Information. TY - Tech Report AU - Jung, Jaehoon AU - Olsen, Michael J. AU - Che, Erzhuo AU - Rastiveis, Heidar AU - Turkan, Yelda AU - Parrish, Christopher A2 - Oregon State University A3 - Oregon. Department of Transportation. Research Section A3 - United States. Department of Transportation. Federal Highway Administration AB - Pedestrian crosswalks, bike lanes, and medians are key safety devices in a multi-modal highway network. However, there is no statewide map of these assets' locations and types. Such a map would benefit planning, maintenance, safety assessments, and network analyses for ODOT and its partners. Currently, ODOT collects asset information through site visits and surveys, which are labor-intensive and costly across the state's vast road network. GIS databases are created ad-hoc and inconsistently, often by interns. Fortunately, ODOT Engineering Automation regularly collects 3D mobile lidar data, providing geometric and radiometric information. This research reviewed state-of-the-art approaches for detecting and classifying pedestrian crosswalks, bike lanes, and medians, and developed a methodology to extract these features from LiDAR datasets for updating ODOT's GIS platform. The approach was tested on several datasets and showed good extraction performance, requiring minimal manual cleanup. Lastly, a plan is provided for ODOT to implement this research. AN - dot:92752 DA - 2026-07-01 ET - Final Report KW - Laser radar KW - Photogrammetry KW - Data collection KW - Crosswalks KW - Bicycle lanes KW - Medians KW - Asset management KW - Inventory KW - Automation KW - Geographic information systems KW - Procedures KW - Mobile lidar KW - Photogrammetric data KW - Classification LA - English PB - Oregon. Department of Transportation. Research Section PY - 2026 SN - FHWA-OR-RD-27-03 TI - Automated Lidar Data to Develop and Manage Active Transportation Asset Inventories M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92752 ER -
Transit Safety Past the Peak: Centering Vulnerable Riders in Mobility Hub Design [Policy Brief]

Valente, Luis

2026-07-01 | PDF

This project examined the Los Angeles Department of Transportation's Integrated Mobility Hubs (IMH) project to identify design improvements and planning practices and policies that can make transit safer and more accessible after dark.

08/03/2026

Title : Transit Safety Past the Peak: Centering Vulnerable Riders in Mobility Hub Design [Policy Brief] Creator(s) : Valente, Luis Corporate Creator(s) : University of California, Los Angeles. Lewis Center for Regional Policy Studies Published Date : 2026-07-01 URL : https://rosap.ntl.bts.gov/view/dot/92751
Valente, L. (2026). Transit Safety Past the Peak: Centering Vulnerable Riders in Mobility Hub Design [Policy Brief]. University of California, Los Angeles. Lewis Center for Regional Policy Studies. https://rosap.ntl.bts.gov/view/dot/92751

Valente, Luis. Transit Safety Past the Peak: Centering Vulnerable Riders in Mobility Hub Design [Policy Brief]. University of California, Los Angeles. Lewis Center for Regional Policy Studies, 2026. https://rosap.ntl.bts.gov/view/dot/92751.

Valente, Luis Transit Safety Past the Peak: Centering Vulnerable Riders in Mobility Hub Design [Policy Brief]. University of California, Los Angeles. Lewis Center for Regional Policy Studies, 2026, ROSA P. https://rosap.ntl.bts.gov/view/dot/92751.
Export RIS Citation Information. TY - Brief AU - Valente, Luis A2 - University of California, Los Angeles. Lewis Center for Regional Policy Studies AB - This project examined the Los Angeles Department of Transportation's Integrated Mobility Hubs (IMH) project to identify design improvements and planning practices and policies that can make transit safer and more accessible after dark. AN - dot:92751 DA - 2026-07-01 ET - Policy Brief KW - Transit safety KW - Vulnerable road users KW - Mobility KW - Hubs KW - Demographics KW - Case studies KW - Interviewing KW - Commuters KW - Gender KW - Low income groups KW - Policy KW - Night KW - Data analysis KW - Transportation planning KW - Transportation equity LA - English PB - University of California, Los Angeles. Lewis Center for Regional Policy Studies PY - 2026 TI - Transit Safety Past the Peak: Centering Vulnerable Riders in Mobility Hub Design [Policy Brief] M3 - Brief N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92751 ER -
Investigating the Aging Behavior of Asphalt Binders at Different Production Stages and During the Service Life of the Pavement

Elkashef, Mohamed ;

Mishra, Debakanta (Deb)

2025-11-01 | PDF

This study examines how asphalt mixtures change over time and how their performance is influenced by material selection and environmental factors. Thirty-six asphalt mixes produced in Oklahoma were collected and tested to understand their behavior in terms of cracking, rutting, moisture damage, and compaction. The work focuses on how aging affects ...

08/03/2026

Title : Investigating the Aging Behavior of Asphalt Binders at Different Production Stages and During the Service Life of the Pavement Creator(s) : Elkashef, Mohamed;Mishra, Debakanta (Deb);Rad, Sina Mousavi;Olagunju, Michael;Sadeghi, Mehdi;Gbolade, Adeoluwa; Corporate Creator(s) : Oklahoma State University Corporate Contributor(s) : Oklahoma. Department of Transportation. Office of Research and Implementation;United States. Department of Transportation. Federal Highway Administration; Published Date : 2025-11-01 Report Number : FHWA-OK-26-01 URL : https://rosap.ntl.bts.gov/view/dot/92750
Elkashef, M., Mishra, D. (., Rad, S. M., Olagunju, M., Sadeghi, M., & Gbolade, A. (2025). Investigating the Aging Behavior of Asphalt Binders at Different Production Stages and During the Service Life of the Pavement (Report No. FHWA-OK-26-01). Oklahoma. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/92750

Elkashef, Mohamed, Debakanta (Deb) Mishra, Sina Mousavi Rad, Michael Olagunju, Mehdi Sadeghi, and Adeoluwa Gbolade. Investigating the Aging Behavior of Asphalt Binders at Different Production Stages and During the Service Life of the Pavement. Report no. FHWA-OK-26-01. Oklahoma. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/92750.

Elkashef, Mohamed, et al. Investigating the Aging Behavior of Asphalt Binders at Different Production Stages and During the Service Life of the Pavement. Oklahoma. Department of Transportation, 2025, Report no. FHWA-OK-26-01, ROSA P. https://rosap.ntl.bts.gov/view/dot/92750.
Export RIS Citation Information. TY - Tech Report AU - Elkashef, Mohamed AU - Mishra, Debakanta (Deb) AU - Rad, Sina Mousavi AU - Olagunju, Michael AU - Sadeghi, Mehdi AU - Gbolade, Adeoluwa A2 - Oklahoma State University A3 - Oklahoma. Department of Transportation. Office of Research and Implementation A3 - United States. Department of Transportation. Federal Highway Administration AB - This study examines how asphalt mixtures change over time and how their performance is influenced by material selection and environmental factors. Thirty-six asphalt mixes produced in Oklahoma were collected and tested to understand their behavior in terms of cracking, rutting, moisture damage, and compaction. The work focuses on how aging affects these properties, since asphalt becomes stiffer and more brittle as it ages in the field. Cracking resistance was measured using the IDEAL-CT test, and both CTIndex and its underlying parameters were analyzed before and after lab-simulated long-term oven aging. Statistical and data analysis methods were used to interpret trends, and Machine Learning models were developed to predict CTIndex from mix variables. Rutting and moisture susceptibility were evaluated using the HWT and IDT-HT tests. Binder rheology was assessed through frequency-temperature sweep testing. Results showed that long-term aging significantly reduced cracking resistance and mix variables such as NMAS, RAP content, and binder grade significantly influenced CTIndex. The Corrected Rut Depth parameter provided a clearer indication of rutting than Total Rut Depth, and an IDT-HT strength of 240 kPa is suggested as a production acceptance threshold for rutting. Freeze-thaw conditioning affected rutting and stripping of most of the mixes. These findings support performance-based mix design and help guide mixture selection for durable pavements. AN - dot:92750 DA - 2025-11-01 ET - Final Report: Aug 2022 - Nov 2025 KW - Material aging KW - Cracking KW - Rutting KW - Moisture damage KW - Predictive models KW - Asphalt mixtures KW - Binders KW - Service life KW - Performance based specifications KW - Machine learning KW - Statistical analysis LA - English PB - Oklahoma. Department of Transportation PY - 2025 SN - FHWA-OK-26-01 TI - Investigating the Aging Behavior of Asphalt Binders at Different Production Stages and During the Service Life of the Pavement M3 - Tech Report N1 - United States N1 - 2294 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92750 ER -
Identify Bridge Design Guidelines for Wildlife Crossings

Padfield, Jon

;

Squillace, Kyle

2026-02-20 | PDF

Annual vehicle miles driven in the United States doubled, from 1.6 trillion to 3.2 trillion in the 40 years between 1983 and 2023. Unfortunately, one side effect of the increase in vehicle miles driven has been the prevalence of Animal-Vehicle Collisions (AVCs). As early as 1975, efforts began in some Western states to create safe animal passages s ...

08/03/2026

Title : Identify Bridge Design Guidelines for Wildlife Crossings Creator(s) : Padfield, Jon;Squillace, Kyle; Corporate Creator(s) : Purdue University. Joint Transportation Research Program Corporate Contributor(s) : Indiana Department of Transportation;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-02-20 Report Number : FHWA/IN/JTRP-2026/10 DOI : https://doi.org/10.5703/1288284318618
Padfield, J., & Squillace, K. (2026). Identify Bridge Design Guidelines for Wildlife Crossings (Report No. FHWA/IN/JTRP-2026/10). Purdue University. Joint Transportation Research Program. https://doi.org/10.5703/1288284318618

Padfield, Jon and Kyle Squillace. Identify Bridge Design Guidelines for Wildlife Crossings. Report no. FHWA/IN/JTRP-2026/10. Purdue University. Joint Transportation Research Program, 2026. https://doi.org/10.5703/1288284318618.

Padfield, Jon, and Kyle Squillace Identify Bridge Design Guidelines for Wildlife Crossings. Purdue University. Joint Transportation Research Program, 2026, Report no. FHWA/IN/JTRP-2026/10, ROSA P. https://doi.org/10.5703/1288284318618.
Export RIS Citation Information. TY - Tech Report AU - Padfield, Jon AU - Squillace, Kyle A2 - Purdue University. Joint Transportation Research Program A3 - Indiana Department of Transportation A3 - United States. Department of Transportation. Federal Highway Administration AB - Annual vehicle miles driven in the United States doubled, from 1.6 trillion to 3.2 trillion in the 40 years between 1983 and 2023. Unfortunately, one side effect of the increase in vehicle miles driven has been the prevalence of Animal-Vehicle Collisions (AVCs). As early as 1975, efforts began in some Western states to create safe animal passages such as the wildlife overpass over I-15 in Beaver, Utah. Wildlife passages increased in popularity from the 1970s through the 1990s, but they were mainly being designed and constructed in the Western United States. Today, there is increasing and broader interest in safe wildlife passages across the United States with major coalitions forming in different areas to promote the adoption of wildlife passages for both animal and human safety. This study examines what other Midwestern states are doing regarding designing animal passages into new and reconstruction bridge projects. In this area, Indiana is a leader in making accommodations for small wildlife passages as states such as Michigan and Tennessee have not yet incorporated wildlife crossing into their bridge design process. Ohio has integrated input from their Department of Natural Resources into its bridge design process, but it is not frequently used and the input is essentially only suggestion rather than requirement. This study also examines the root cause of delays and increased costs on some INDOT bridge designs related to rework caused by not having timely input from DNR regarding wildlife crossings. This study has identified two key recommendations where making minor changes in INDOT's New Project Development Process could ensure the timely flow of information to and from DNR to prevent late changes in bridge projects. AN - dot:92749 DA - 2026-02-20 DO - https://doi.org/10.5703/1288284318618 ET - Final Report KW - Wildlife crossings KW - Roadside fauna KW - Bridge design KW - Guidelines KW - Vehicle miles of travel KW - Animal vehicle crashes KW - animal crossings LA - English PB - Purdue University. Joint Transportation Research Program PY - 2026 SN - FHWA/IN/JTRP-2026/10 TI - Identify Bridge Design Guidelines for Wildlife Crossings M3 - Tech Report N1 - United States N1 - SPR-4922 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92749 ER -
Development of an ML-Based Georgia Pavement Structural Condition Evaluation System

Tsai, Yichang (James)

;

Yang, Zhongyu

2026-07-01 | PDF

Georgia's aging interstate highway network requires more reliable pavement evaluation to support maintenance and rehabilitation (M&R) planning. Current network-level practices rely primarily on surface condition data, which can lead to project-level cost overruns when structural deficiencies are discovered only after budgets have been defined from ...

08/03/2026

Title : Development of an ML-Based Georgia Pavement Structural Condition Evaluation System Creator(s) : Tsai, Yichang (James);Yang, Zhongyu;Lu, Bingjie; Corporate Creator(s) : Georgia Institute of Technology Corporate Contributor(s) : Georgia. Department of Transportation. Office of Performance-Based Management & Research;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-07-01 Report Number : FHWA-GA-26-2304 URL : https://rosap.ntl.bts.gov/view/dot/92748
Tsai, Y. (., Yang, Z., & Lu, B. (2026). Development of an ML-Based Georgia Pavement Structural Condition Evaluation System (Report No. FHWA-GA-26-2304). Georgia. Department of Transportation. Office of Performance-Based Management & Research. https://rosap.ntl.bts.gov/view/dot/92748

Tsai, Yichang (James), Zhongyu Yang, and Bingjie Lu. Development of an ML-Based Georgia Pavement Structural Condition Evaluation System. Report no. FHWA-GA-26-2304. Georgia. Department of Transportation. Office of Performance-Based Management & Research, 2026. https://rosap.ntl.bts.gov/view/dot/92748.

Tsai, Yichang (James), et al. Development of an ML-Based Georgia Pavement Structural Condition Evaluation System. Georgia. Department of Transportation. Office of Performance-Based Management & Research, 2026, Report no. FHWA-GA-26-2304, ROSA P. https://rosap.ntl.bts.gov/view/dot/92748.
Export RIS Citation Information. TY - Tech Report AU - Tsai, Yichang (James) AU - Yang, Zhongyu AU - Lu, Bingjie A2 - Georgia Institute of Technology A3 - Georgia. Department of Transportation. Office of Performance-Based Management & Research A3 - United States. Department of Transportation. Federal Highway Administration AB - Georgia's aging interstate highway network requires more reliable pavement evaluation to support maintenance and rehabilitation (M&R) planning. Current network-level practices rely primarily on surface condition data, which can lead to project-level cost overruns when structural deficiencies are discovered only after budgets have been defined from surface indicators. Traffic Speed Deflection Device (TSDD) technology enables continuous structural response measurement at highway speeds, but Georgia-specific TSDD-based screening rules calibrated against laboratory performance references have not been established. In addition, an integrated framework for combining structural and surface condition in treatment decision-making has not yet been implemented. This study develops Georgia-specific pavement structural condition classification methods and an integrated surface-structural treatment decision framework. The analysis uses TSDD, Ground Penetrating Radar (GPR), Three-Dimensional (3D) pavement surface data, and Hamburg Wheel-Track Testing (HWTT) results from I-59, I-285, and I-575. A quality-controlled dataset of 85 flexible pavement sections was constructed through missing data analysis, pavement-type screening, and a nearest-neighbor spatial joining process. Threshold-based and machine learning (ML) methods were evaluated under the same repeated stratified cross-validation (CV) protocol. The single-variable SCI_8 threshold achieved a mean F1 score of 0.806 and a mean Area Under the Curve (AUC) of 0.888 across 50 validation splits, providing a simple and interpretable candidate baseline for pilot structural screening. The SCI_8 + AC thickness duo-variable threshold achieved the highest mean F1 score among all methods, with F1 = 0.834 and AUC = 0.887, showing that GPR-derived asphalt thickness improves structural detection. Among the ML classifiers, Random Forest (RF) performed best, with F1 = 0.822 and the highest AUC of 0.891. A staged pilot implementation pathway is recommended: SCI_8 threshold screening for near-term pilot use, SCI_8 + AC thickness screening when reliable GPR data are available, and RF as a scalable ML engine as labeled data expand. The treatment framework translates structural and functional condition into four candidate M&R categories: No Action, Milling and Resurfacing, Close Monitoring, and Major Rehabilitation. Corridor-level maps demonstrate that the framework can distinguish surface-driven needs, structure-driven monitoring needs, and combined deterioration patterns, establishing an initial Georgia-specific research-scale foundation for incorporating TSDD-based structural screening into GDOT's pavement management system (PMS), subject to further corridor-level validation. AN - dot:92748 DA - 2026-07-01 ET - Final Report (January 2024 - July 2026) KW - Traffic control devices KW - Deflection KW - Pavement condition KW - Ground penetrating radar KW - Machine learning KW - Pavement management systems KW - Corridors KW - Rehabilitation KW - Monitoring KW - Maintenance KW - Evaluation KW - Traffic Speed Deflection Device KW - Pavement Structural Condition KW - Threshold-Based Classification LA - English PB - Georgia. Department of Transportation. Office of Performance-Based Management & Research PY - 2026 SN - FHWA-GA-26-2304 TI - Development of an ML-Based Georgia Pavement Structural Condition Evaluation System M3 - Tech Report N1 - United States N1 - 0019906 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92748 ER -
SEAHIVE® Solutions to Mitigate Bridge Scour-Phase I [Annual Research Report- Part 1]

Nanni, Antonio

;

Barbarigos, Landolf

2024-06-29 | PDF

Protecting coastal regions is crucial because of high population density and important economic significance. Numerous strategies have been suggested to safeguard coastal regions and bridge piers from scouring, encompassing natural and man-made approaches. Given the constraints of existing techniques, this study examines a new method named SEAHIVE® ...

08/03/2026

Title : SEAHIVE® Solutions to Mitigate Bridge Scour-Phase I [Annual Research Report- Part 1] Creator(s) : Nanni, Antonio;Barbarigos, Landolf;Kulesza, Stacey;Mirdarsoltany, Mohammadamin; Corporate Creator(s) : University of Miami;Texas State University--San Marcos; Corporate Contributor(s) : CREATE - Coastal REsearch And Transportation Education;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 : 2024-06-29 Report Number : 2301-11 URL : https://rosap.ntl.bts.gov/view/dot/92747
Nanni, A., Barbarigos, L., Kulesza, S., & Mirdarsoltany, M. (2024). SEAHIVE® Solutions to Mitigate Bridge Scour-Phase I [Annual Research Report- Part 1] (Report No. 2301-11). CREATE - Coastal REsearch And Transportation Education. https://rosap.ntl.bts.gov/view/dot/92747

Nanni, Antonio, Landolf Barbarigos, Stacey Kulesza, and Mohammadamin Mirdarsoltany. SEAHIVE® Solutions to Mitigate Bridge Scour-Phase I [Annual Research Report- Part 1]. Report no. 2301-11. CREATE - Coastal REsearch And Transportation Education, 2024. https://rosap.ntl.bts.gov/view/dot/92747.

Nanni, Antonio, et al. SEAHIVE® Solutions to Mitigate Bridge Scour-Phase I [Annual Research Report- Part 1]. CREATE - Coastal REsearch And Transportation Education, 2024, Report no. 2301-11, ROSA P. https://rosap.ntl.bts.gov/view/dot/92747.
Export RIS Citation Information. TY - Tech Report AU - Nanni, Antonio AU - Barbarigos, Landolf AU - Kulesza, Stacey AU - Mirdarsoltany, Mohammadamin A2 - University of Miami A2 - Texas State University--San Marcos A3 - CREATE - Coastal REsearch And Transportation Education 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 - Protecting coastal regions is crucial because of high population density and important economic significance. Numerous strategies have been suggested to safeguard coastal regions and bridge piers from scouring, encompassing natural and man-made approaches. Given the constraints of existing techniques, this study examines a new method named SEAHIVE®, which is designed to improve the performance of engineered structures. This method incorporates hexagonal, hollow, and perforated concrete elements, which are reinforced with glass fiber-reinforced polymer (GFRP) bars or wraps. To investigate the load-bearing capacity, SEAHIVE® specimens were tested under pure compression (cut-off samples) and flexure (full samples). For specimens under pure compression, analysis, and experimentation showed that cracks started due to exceeding the concrete tensile strength in the inclined leg of the hexagon and eventually led to failure in both elements reinforced with GFRP bars or wraps. In elements reinforced with GFRP bars tested under flexure, the strut-and-tie analysis confirmed that SEAHIVE® beam-like specimens failed because of inadequate development length of longitudinal bars and toe crushing. As for the sample reinforced with GFRP wraps under flexure, cracks initiated due to the slipping and loss of the longitudinal GFRP strips. AN - dot:92747 DA - 2024-06-29 ET - Final Collaborative: 9/1/23-12/31/25 KW - Glass fiber reinforced plastics KW - Reinforced concrete KW - Flexure KW - Compression KW - Shear tests KW - Analysis KW - Cracking KW - Tensile strength KW - Failure KW - Bridges KW - Scour KW - Coasts KW - Longitudinal strength KW - Strut and tie method KW - Hollow Concrete Shape LA - English PB - CREATE - Coastal REsearch And Transportation Education PY - 2024 SN - 2301-11 TI - SEAHIVE® Solutions to Mitigate Bridge Scour-Phase I [Annual Research Report- Part 1] M3 - Tech Report N1 - United States N1 - 69A3552348330 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92747 ER -
COLLABORATIVE: SEAHIVE® Solutions to Mitigate Bridge Scour-Phase I Scour

Akte, Sonia ;

Castillom, Rodolfo

2026-07-06 | PDF

This study investigates the performance of SEAHIVE®, a modular, bio-inspired concrete structure with surface perforations, as a proactive countermeasure to mitigate local scour around bridge piers. Despite increasing frequency of extreme hydraulic events, the design approach to scour remains reactive with conventional methods such as riprap and gab ...

08/03/2026

Title : COLLABORATIVE: SEAHIVE® Solutions to Mitigate Bridge Scour-Phase I Scour Creator(s) : Akte, Sonia;Castillom, Rodolfo;Faroughi, Salah;Kulesza, Stacey;Rhode-Barbarigos, Landolf; Corporate Creator(s) : Texas State University--San Marcos. Dept. of Engineering Technology;University of Utah;University of Miami; Corporate Contributor(s) : CREATE - Coastal REsearch And Transportation Education;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 : 2026-07-06 Report Number : 2301-11 URL : https://rosap.ntl.bts.gov/view/dot/92746
Akte, S., Castillom, R., Faroughi, S., Kulesza, S., & Rhode-Barbarigos, L. (2026). COLLABORATIVE: SEAHIVE® Solutions to Mitigate Bridge Scour-Phase I Scour (Report No. 2301-11). CREATE - Coastal REsearch And Transportation Education. https://rosap.ntl.bts.gov/view/dot/92746

Akte, Sonia, Rodolfo Castillom, Salah Faroughi, Stacey Kulesza, and Landolf Rhode-Barbarigos. COLLABORATIVE: SEAHIVE® Solutions to Mitigate Bridge Scour-Phase I Scour. Report no. 2301-11. CREATE - Coastal REsearch And Transportation Education, 2026. https://rosap.ntl.bts.gov/view/dot/92746.

Akte, Sonia, et al. COLLABORATIVE: SEAHIVE® Solutions to Mitigate Bridge Scour-Phase I Scour. CREATE - Coastal REsearch And Transportation Education, 2026, Report no. 2301-11, ROSA P. https://rosap.ntl.bts.gov/view/dot/92746.
Export RIS Citation Information. TY - Tech Report AU - Akte, Sonia AU - Castillom, Rodolfo AU - Faroughi, Salah AU - Kulesza, Stacey AU - Rhode-Barbarigos, Landolf A2 - Texas State University--San Marcos. Dept. of Engineering Technology A2 - University of Utah A2 - University of Miami A3 - CREATE - Coastal REsearch And Transportation Education 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 study investigates the performance of SEAHIVE®, a modular, bio-inspired concrete structure with surface perforations, as a proactive countermeasure to mitigate local scour around bridge piers. Despite increasing frequency of extreme hydraulic events, the design approach to scour remains reactive with conventional methods such as riprap and gabion mattresses after scour initiation. This research considers an alternative where scour mitigation is proactive by integrating SEAHIVE® elements to reduce flow-induced erosion before it reaches critical levels. The efficacy of SEAHIVE® as scour mitigation was explored experimentally and computationally. Experimental flume tests were conducted on both standalone and grouped SEAHIVE® configurations to quantify scour depth and energy dissipation relative to traditional circular monopiles. High-fidelity numerical simulations were performed using the SedFOAM solver within the Open FOAM framework, applying a two-phase flow model with k-?? turbulence closure to further quantify the fluid/sediment interactions. The results demonstrate that SEAHIVE® reduces vortex strength and turbulence intensity around the pier, leading to measurable improvements in scour mitigation. Experimentally, the standalone SEAHIVE® reduced scour depth by 7%, while the grouped arrangement, placed at three pier diameters upstream, achieved a 70% reduction. Numerically, the fully perforated SEAHIVE® showed a 28% reduction in scour depth, and the zigzag-patterned design achieved a 20% reduction, relative to a non-SEAHIVE® control case. Moreover, when grouped SEAHIVE® units were three pier diameters upstream, scour depth was reduced by approximately 38% and velocity magnitudes by 25%. Analysis of bed morphology and turbulence characteristics revealed that SEAHIVE® elements promoted smoother flow transitions, suppressed horseshoe vortex formation, and redistributed sediment transport away from critical zones. The consistency between experimental and numerical results underscores the validity of using SEAHIVE® in practical applications. AN - dot:92746 DA - 2026-07-06 ET - Final Report: 07-06-2026 KW - Bridges KW - Scour KW - Flow KW - Countermeasures KW - Sediments KW - Morphology KW - SEAHIVE® KW - Scour mitigation KW - SedFOAM KW - Flow-structure interaction LA - English PB - CREATE - Coastal REsearch And Transportation Education PY - 2026 SN - 2301-11 TI - COLLABORATIVE: SEAHIVE® Solutions to Mitigate Bridge Scour-Phase I Scour M3 - Tech Report N1 - United States N1 - 69A3552348330 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92746 ER -
Avalanche Signage: Avalanche Warning Signs Along Roadways

Sharp, Eirik ;

Thumlert, Scott

2025-03-01 | PDF

Avalanche signage is a critical component of risk management for transportation infrastructure in avalanche-prone regions. Effective signage not only reduces the exposure and vulnerability of road users but also demonstrates a proactive duty of care by transportation authorities. A comparative analysis of the current approaches to avalanche signage ...

08/03/2026

Title : Avalanche Signage: Avalanche Warning Signs Along Roadways Creator(s) : Sharp, Eirik;Thumlert, Scott;Campbell, Cam;Gould, Brian; Corporate Creator(s) : Alpine Solutions Avalanche Services Corporate Contributor(s) : Transportation Avalanche Research Pool;United States. Department of Transportation. Federal Highway Administration;Alaska. Department of Transportation and Public Facilities;New Zealand Transport Agency;Colorado Department of Transportation. Office of Applied Research; Contributor(s) : Glassett, Tim;Thompson, Kevin; Published Date : 2025-03-01 Report Number : CDOT-2025-01 URL : https://rosap.ntl.bts.gov/view/dot/92745
Sharp, E., Thumlert, S., Campbell, C., & Gould, B. (2025). Avalanche Signage: Avalanche Warning Signs Along Roadways (Report No. CDOT-2025-01). Colorado Department of Transportation. Applied Research & Innovations Branch. https://rosap.ntl.bts.gov/view/dot/92745

Sharp, Eirik, Scott Thumlert, Cam Campbell, and Brian Gould. Avalanche Signage: Avalanche Warning Signs Along Roadways. Report no. CDOT-2025-01. Colorado Department of Transportation. Applied Research & Innovations Branch, 2025. https://rosap.ntl.bts.gov/view/dot/92745.

Sharp, Eirik, et al. Avalanche Signage: Avalanche Warning Signs Along Roadways. Colorado Department of Transportation. Applied Research & Innovations Branch, 2025, Report no. CDOT-2025-01, ROSA P. https://rosap.ntl.bts.gov/view/dot/92745.
Export RIS Citation Information. TY - Tech Report AU - Sharp, Eirik AU - Thumlert, Scott AU - Campbell, Cam AU - Gould, Brian A2 - Alpine Solutions Avalanche Services A3 - Transportation Avalanche Research Pool A3 - United States. Department of Transportation. Federal Highway Administration A3 - Alaska. Department of Transportation and Public Facilities A3 - New Zealand Transport Agency A3 - Colorado Department of Transportation. Office of Applied Research AB - Avalanche signage is a critical component of risk management for transportation infrastructure in avalanche-prone regions. Effective signage not only reduces the exposure and vulnerability of road users but also demonstrates a proactive duty of care by transportation authorities. A comparative analysis of the current approaches to avalanche signage employed by participating Transportation Avalanche Research Pool agencies reveals a wide range of approaches influenced by local geographic, economic, and traffic conditions. Current guidelines, such as the Manual for Uniform Traffic Control Devices and the Vienna Convention on Road Signs and Signals, do not specifically address snow avalanches and their unique needs, leading to variability across jurisdictions. Specific gaps identified in avalanche signage systems currently used include: • A lack of consistent approach, a lack of design and placement standardization, inconsistent enforcement of regulatory signs, a lack of clear messaging, a lack of detailed records. An action plan for addressing these gaps is provided as recommendations for best practice, including:• Threshold values for avalanche signage, signage placement criteria and considerations, seasonal avalanche signage, sign design criteria and considerations, variable-message signs, maintenance, training and awareness, record keeping, and development of a signage manual. This report highlights the importance of a consistent approach to signage design and placement through a detailed review of insights from behavioral and ergonomic research. While standardization is desirable, avalanche signage should be guided by accurate risk assessments. AN - dot:92745 DA - 2025-03-01 ET - Final Report KW - Signs KW - Avalanches KW - Risk KW - Hazard mitigation KW - Roads KW - Best practices KW - Vulnerable road users KW - Guidelines KW - Signage LA - English PB - Colorado Department of Transportation. Applied Research & Innovations Branch PY - 2025 SN - CDOT-2025-01 TI - Avalanche Signage: Avalanche Warning Signs Along Roadways M3 - Tech Report N1 - United States N1 - TPF-5(497)-24-03 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92745 ER -
Durability of Lightweight Concrete Bridge Decks in Utah

Guthrie, W. Spencer ;

Eusebi-Diehr, Lorenzo

2026-01-01 | PDF

The objectives of this research were to document and compare properties of lightweight concrete and normal-weight concrete used for construction of bridge decks and approach slabs in northern Utah. The scope of work included field and laboratory testing to characterize concrete at three lightweight concrete bridge deck sites and the normal-weight c ...

08/03/2026

Title : Durability of Lightweight Concrete Bridge Decks in Utah Creator(s) : Guthrie, W. Spencer;Eusebi-Diehr, Lorenzo;Burdette, Steven B.; Corporate Creator(s) : Brigham Young University. Department of Civil and Construction Engineering Corporate Contributor(s) : Utah. Department of Transportation. Research and Innovation Division;United States. Department of Transportation. Federal Highway Administration; Published Date : 2026-01-01 Report Number : UT-26.12 URL : https://rosap.ntl.bts.gov/view/dot/92744
Guthrie, W. S., Eusebi-Diehr, L., & Burdette, S. B. (2026). Durability of Lightweight Concrete Bridge Decks in Utah (Report No. UT-26.12). Utah Department of Transportation. https://rosap.ntl.bts.gov/view/dot/92744

Guthrie, W. Spencer, Lorenzo Eusebi-Diehr, and Steven B. Burdette. Durability of Lightweight Concrete Bridge Decks in Utah. Report no. UT-26.12. Utah Department of Transportation, 2026. https://rosap.ntl.bts.gov/view/dot/92744.

Guthrie, W. Spencer, et al. Durability of Lightweight Concrete Bridge Decks in Utah. Utah Department of Transportation, 2026, Report no. UT-26.12, ROSA P. https://rosap.ntl.bts.gov/view/dot/92744.
Export RIS Citation Information. TY - Tech Report AU - Guthrie, W. Spencer AU - Eusebi-Diehr, Lorenzo AU - Burdette, Steven B. A2 - Brigham Young University. Department of Civil and Construction Engineering A3 - Utah. Department of Transportation. Research and Innovation Division A3 - United States. Department of Transportation. Federal Highway Administration AB - The objectives of this research were to document and compare properties of lightweight concrete and normal-weight concrete used for construction of bridge decks and approach slabs in northern Utah. The scope of work included field and laboratory testing to characterize concrete at three lightweight concrete bridge deck sites and the normal-weight concrete approach slabs at one of these sites, as well as laboratory testing to characterize concrete specimens obtained through previous research on lightweight and normal-weight concrete bridge decks. For field testing, a distress survey was performed at each test location, and then cover depth testing, Schmidt rebound hammer testing, resistivity testing, chloride concentration sampling, and coring were performed. For laboratory testing, regarding samples obtained during the current research, modulus of elasticity testing, compressive strength testing, splitting tensile strength testing, rapid chloride permeability and absorption testing, and chloride concentration testing were performed. Regarding samples obtained from previous research, coefficient of thermal expansion testing and freeze-thaw durability testing were performed. As a basis for discussion, ratios of values for lightweight concrete to values of normal-weight concrete were computed for selected properties, for which the normal-weight concrete approach slabs and the normal-weight concrete cores and cylinders were used as a baseline. The properties include resistivity, modulus of elasticity, compressive strength, splitting tensile strength, chloride permeability, absorption, coefficient of thermal expansion, and stiffness retained after freeze-thaw durability testing. Overall, the data suggest that, compared to normal-weight concrete, lightweight concrete absorbs more water, allows higher rates of chloride ion ingress, is more susceptible to degradation under freeze-thaw cycling, and has lower resistance to cracking. Several recommendations were developed to potentially improve the performance of lightweight concrete. AN - dot:92744 DA - 2026-01-01 ET - Final Report: March 2023 to January 2026 KW - Concrete bridges KW - Bridge decks KW - Durability KW - Freeze thaw durability KW - Recycling KW - Lightweight concrete KW - Strength of materials KW - Data analysis KW - Modulus of elasticity KW - Laboratory tests KW - Tension tests LA - English PB - Utah Department of Transportation PY - 2026 SN - UT-26.12 TI - Durability of Lightweight Concrete Bridge Decks in Utah M3 - Tech Report N1 - United States N1 - 23-9019 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92744 ER -
Multi-Source Comprehensive Program to Assess, Monitor, and Report Retroreflectivity of Pavement Markings

Mohammadi, Abbas ;

Medina, Juan C.

2025-12-01 | PDF

This research investigates the feasibility of estimating retroreflectivity of durable longitudinal pavement markings using multi-source data to reduce UDOT's reliance on costly specialized field inspections. The study uses a combination of existing datasets, mobile LiDAR point clouds, street-level roadway imagery, and historical retroreflectivity m ...

08/03/2026

Title : Multi-Source Comprehensive Program to Assess, Monitor, and Report Retroreflectivity of Pavement Markings Creator(s) : Mohammadi, Abbas;Medina, Juan C.;Rashidi, Abbas; Corporate Creator(s) : University of Utah. Department of Civil and Environmental Engineering Corporate Contributor(s) : Utah. Department of Transportation. Research and Innovation Division;United States. Department of Transportation. Federal Highway Administration; Published Date : 2025-12-01 Report Number : UT-26.16 URL : https://rosap.ntl.bts.gov/view/dot/92743
Mohammadi, A., Medina, J. C., & Rashidi, A. (2025). Multi-Source Comprehensive Program to Assess, Monitor, and Report Retroreflectivity of Pavement Markings (Report No. UT-26.16). Utah Department of Transportation. https://rosap.ntl.bts.gov/view/dot/92743

Mohammadi, Abbas, Juan C. Medina, and Abbas Rashidi. Multi-Source Comprehensive Program to Assess, Monitor, and Report Retroreflectivity of Pavement Markings. Report no. UT-26.16. Utah Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/92743.

Mohammadi, Abbas, et al. Multi-Source Comprehensive Program to Assess, Monitor, and Report Retroreflectivity of Pavement Markings. Utah Department of Transportation, 2025, Report no. UT-26.16, ROSA P. https://rosap.ntl.bts.gov/view/dot/92743.
Export RIS Citation Information. TY - Tech Report AU - Mohammadi, Abbas AU - Medina, Juan C. AU - Rashidi, Abbas A2 - University of Utah. Department of Civil and Environmental Engineering A3 - Utah. Department of Transportation. Research and Innovation Division A3 - United States. Department of Transportation. Federal Highway Administration AB - This research investigates the feasibility of estimating retroreflectivity of durable longitudinal pavement markings using multi-source data to reduce UDOT's reliance on costly specialized field inspections. The study uses a combination of existing datasets, mobile LiDAR point clouds, street-level roadway imagery, and historical retroreflectivity measurements to develop robust predictive models for assessing pavement marking condition. The research uses existing field retroreflectivity data across major Utah roadways, including I-15, I-80, I-84, and I-215. The study corridors are dominated by durable pavement markings, so the model development and validation presented in this report primarily reflect the performance of durable marking materials. LiDAR data provided geometry and intensity of light reflected back to the sensing unit, while roadway images were processed to extract visual features and assess the condition of lane markings. Both data streams (i.e., LiDAR and imagery) were analyzed independently and also in combination using machine learning methods, including Random Forest classifiers and convolutional neural networks (CNNs). A fusion model was developed to integrate LiDAR and image-based features for enhanced performance. Results demonstrated that image- and LiDAR-only models can accurately classify pavement markings as compliant or non-compliant with federal minimum retroreflectivity standards. The fusion model outperformed individual models, achieving over 95% accuracy and strong agreement with ground truth data at both segment and corridor levels. Regression models were also developed to predict continuous retroreflectivity values directly from image features. The methods developed in this research were implemented in a portable, user-friendly computer tool that enables UDOT to estimate and monitor pavement marking retroreflectivity via data fusion, LiDAR-only, or image-only models. This approach enhances operational efficiency, supports monitoring for federal compliance, and provides a scalable framework for statewide deployment. This study builds on a previous UDOT research phase that evaluated LiDAR‑only retroreflectivity estimation and extends that work by incorporating street‑level imagery and multi‑source data fusion. AN - dot:92743 DA - 2025-12-01 ET - Final Report: Jul 2024 to Dec 2025 KW - Pavements KW - Road markings KW - Retroreflectivity KW - Laser radar KW - Image processing KW - Data fusion KW - Machine learning KW - Neural networks KW - Feasibility analysis KW - Monitoring KW - Pavement marking retroreflectivity KW - LiDAR intensity KW - random forest classifier KW - convolutional neural network LA - English PB - Utah Department of Transportation PY - 2025 SN - UT-26.16 TI - Multi-Source Comprehensive Program to Assess, Monitor, and Report Retroreflectivity of Pavement Markings M3 - Tech Report N1 - United States N1 - 25-8077 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92743 ER -
Quantify Bridge and Pavement Consumption Due to Permitted Overweight Vehicles [Project Summary Report]

Prozzi, Jorge

;

Inoue, Danilo

2026-02-28 | PDF

This study evaluated data provided by the Texas Department of Motor Vehicles (TxDMV) contained in the Texas Permitting Routing and Optimization System (TxPROS). This database includes a total of 2,122,616 OW permits spanning the 2018-2023 calendar years. More than one thousand distinct axle configurations were identified. The next step was the deve ...

08/03/2026

Title : Quantify Bridge and Pavement Consumption Due to Permitted Overweight Vehicles [Project Summary Report] Creator(s) : Prozzi, Jorge;Inoue, Danilo;Weissmann, Angela;Weissmann, Jose;Glover, Brianne; Corporate Creator(s) : University of Texas at Austin. Center for Transportation Research 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 URL : https://rosap.ntl.bts.gov/view/dot/92742
Prozzi, J., Inoue, D., Weissmann, A., Weissmann, J., & Glover, B. (2026). Quantify Bridge and Pavement Consumption Due to Permitted Overweight Vehicles [Project Summary Report]. University of Texas at Austin. Center for Transportation Research. https://rosap.ntl.bts.gov/view/dot/92742

Prozzi, Jorge, Danilo Inoue, Angela Weissmann, Jose Weissmann, and Brianne Glover. Quantify Bridge and Pavement Consumption Due to Permitted Overweight Vehicles [Project Summary Report]. University of Texas at Austin. Center for Transportation Research, 2026. https://rosap.ntl.bts.gov/view/dot/92742.

Prozzi, Jorge, et al. Quantify Bridge and Pavement Consumption Due to Permitted Overweight Vehicles [Project Summary Report]. University of Texas at Austin. Center for Transportation Research, 2026, ROSA P. https://rosap.ntl.bts.gov/view/dot/92742.
Export RIS Citation Information. TY - Brief AU - Prozzi, Jorge AU - Inoue, Danilo AU - Weissmann, Angela AU - Weissmann, Jose AU - Glover, Brianne A2 - University of Texas at Austin. Center for Transportation Research A3 - Texas Department of Transportation. Research and Technology Implementation Office A3 - United States. Department of Transportation. Federal Highway Administration AB - This study evaluated data provided by the Texas Department of Motor Vehicles (TxDMV) contained in the Texas Permitting Routing and Optimization System (TxPROS). This database includes a total of 2,122,616 OW permits spanning the 2018-2023 calendar years. More than one thousand distinct axle configurations were identified. The next step was the development of a methodology to estimate annual VMT for each permit type. A comprehensive analysis by industry type was conducted for all permits, which helped establish consistency with other state- and federal-level freight movement reports. AN - dot:92742 DA - 2026-02-28 ET - Project Summary Report KW - Heavy vehicles KW - Permits KW - Energy consumption KW - Pavement design KW - Equivalent single axle loads KW - Bridges KW - Infrastructure KW - Roads KW - Deterioration KW - Databases LA - English PB - University of Texas at Austin. Center for Transportation Research PY - 2026 TI - Quantify Bridge and Pavement Consumption Due to Permitted Overweight Vehicles [Project Summary Report] M3 - Brief N1 - United States N1 - 0-7195 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92742 ER -
N-Version Software Demonstration for Digital Flight Controls

Mulcare, D. B. ;

Barton, L. A.

1987-03-01 | PDF

This report illustrates how four independently developed versions of digital flight controls applications software might be used in quadruplex system architecture. This approach to software fault tolerance is called N-version software. Here each computer channel has distinct versions of Ada programming units performing the same functions concurrent ...

08/03/2026

Title : N-Version Software Demonstration for Digital Flight Controls Creator(s) : Mulcare, D. B.;Barton, L. A.; Corporate Creator(s) : Lockheed-California Company Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Technical Center Published Date : 1987-03-01 Report Number : DOT/FAA/CT-86/33 URL : https://rosap.ntl.bts.gov/view/dot/92741
Mulcare, D. B., & Barton, L. A. (1987). N-Version Software Demonstration for Digital Flight Controls (Report No. DOT/FAA/CT-86/33). United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. https://rosap.ntl.bts.gov/view/dot/92741

Mulcare, D. B. and L. A. Barton. N-Version Software Demonstration for Digital Flight Controls. Report no. DOT/FAA/CT-86/33. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1987. https://rosap.ntl.bts.gov/view/dot/92741.

Mulcare, D. B., and L. A. Barton N-Version Software Demonstration for Digital Flight Controls. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1987, Report no. DOT/FAA/CT-86/33, ROSA P. https://rosap.ntl.bts.gov/view/dot/92741.
Export RIS Citation Information. TY - Tech Report AU - Mulcare, D. B. AU - Barton, L. A. A2 - Lockheed-California Company A3 - United States. Department of Transportation. Federal Aviation Administration. Technical Center AB - This report illustrates how four independently developed versions of digital flight controls applications software might be used in quadruplex system architecture. This approach to software fault tolerance is called N-version software. Here each computer channel has distinct versions of Ada programming units performing the same functions concurrently. Since intermediate software results are voted to detect and isolate discrepant computations, cross-channel synchronization occurs at each voting plane. The demonstration of this system was based on a high-level software design, English language specifications, and associated Ada program unit specifications parts. The demonstration was performed in non-real-time on a single VAX 8600 computer using an Ada multitasking test harness to effect voting plane synchronization and test case application and analyses. Keywords include: Ada Programming Language, Digital flight controls, Multitasking Test harness, N-Version programming, Quadruplex redundancy, Software fault tolerance, Software specification, and Software testing. AN - dot:92741 DA - 1987-03-01 KW - Air traffic control KW - Electronic equipment KW - Flight control systems KW - Software KW - Fault tolerant computing LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1987 SN - DOT/FAA/CT-86/33 TI - N-Version Software Demonstration for Digital Flight Controls M3 - Tech Report N1 - United States N1 - NAS2-11853 DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92741 ER -
Hardware Fault Insertion and Instrumentation System: Mechanization and Validation

Benson, J. W.

1987-03-01 | PDF

This effort was performed to provide automated test capability for extensive low-level hardware fault insertion testing. The capability developed was applied in a related task that is described in DOT/FAA/CT-86/34. The test capability was used to calibrate fault detection coverage and associated latency times as relevant to projecting overall syste ...

08/03/2026

Title : Hardware Fault Insertion and Instrumentation System: Mechanization and Validation Creator(s) : Benson, J. W. Corporate Creator(s) : Lockheed-California Company Corporate Contributor(s) : United States. Department of Transportation. Federal Aviation Administration. Technical Center Published Date : 1987-03-01 Report Number : DOT/FAA/CT-86/31 URL : https://rosap.ntl.bts.gov/view/dot/92740
Benson, J. W. (1987). Hardware Fault Insertion and Instrumentation System: Mechanization and Validation (Report No. DOT/FAA/CT-86/31). United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. https://rosap.ntl.bts.gov/view/dot/92740

Benson, J. W.. Hardware Fault Insertion and Instrumentation System: Mechanization and Validation. Report no. DOT/FAA/CT-86/31. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1987. https://rosap.ntl.bts.gov/view/dot/92740.

Benson, J. W. Hardware Fault Insertion and Instrumentation System: Mechanization and Validation. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 1987, Report no. DOT/FAA/CT-86/31, ROSA P. https://rosap.ntl.bts.gov/view/dot/92740.
Export RIS Citation Information. TY - Tech Report AU - Benson, J. W. A2 - Lockheed-California Company A3 - United States. Department of Transportation. Federal Aviation Administration. Technical Center AB - This effort was performed to provide automated test capability for extensive low-level hardware fault insertion testing. The capability developed was applied in a related task that is described in DOT/FAA/CT-86/34. The test capability was used to calibrate fault detection coverage and associated latency times as relevant to projecting overall system reliability. AN - dot:92740 DA - 1987-03-01 KW - Testing KW - Data KW - Software KW - Validation KW - Fault tolerance KW - Aeronautics KW - Airborne navigational aids LA - English PB - United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center PY - 1987 SN - DOT/FAA/CT-86/31 TI - Hardware Fault Insertion and Instrumentation System: Mechanization and Validation M3 - Tech Report N1 - United States DB - ROSA P UR - https://rosap.ntl.bts.gov/view/dot/92740 ER -

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