The US Transportation Collection consists of documents from across all transportation modes with specific focus on research reports from US DOT, state DOTs, and other transportation organizations.
Bookmark this collection: https://rosap.ntl.bts.gov/collection_ust or https://doi.org/10.21949/1530857.
Conventional high-speed inertial profilers provide valid international roughness index (IRI) measurements under favorable conditions but experience performance degradation at low speeds, during deceleration and acceleration, or when coming to a stop. Due to these limitations, Louisiana DOTD does not compute performance index (PI) values for certain
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Liu, J., & Chen, Q. (2025). Performance Index Rating and Maintenance Cost Assignment for Ramps, Acceleration Lanes, and Deceleration Lanes in Louisiana (Report No. FHWA/LA.25/713). Louisiana Transportation Research Center. https://rosap.ntl.bts.gov/view/dot/85689
Liu, Jun and Qiming Chen. Performance Index Rating and Maintenance Cost Assignment for Ramps, Acceleration Lanes, and Deceleration Lanes in Louisiana. Report no. FHWA/LA.25/713. Louisiana Transportation Research Center, 2025. https://rosap.ntl.bts.gov/view/dot/85689.
Liu, Jun, and Qiming Chen Performance Index Rating and Maintenance Cost Assignment for Ramps, Acceleration Lanes, and Deceleration Lanes in Louisiana. Louisiana Transportation Research Center, 2025, Report no. FHWA/LA.25/713, ROSA P. https://rosap.ntl.bts.gov/view/dot/85689.
The objective of this project was to create a book that encompasses the Iowa Highway Research Board’s (IHRB’s) history and funded projects from 2000 to 2024.
Gieseman, O., & Hallmark, S. (2025). Iowa Highway Research Board History Book Development [Tech Transfer Summary]. Iowa State University. Institute for Transportation. https://rosap.ntl.bts.gov/view/dot/87056
Gieseman, Oksana and Shauna Hallmark. Iowa Highway Research Board History Book Development [Tech Transfer Summary]. Iowa State University. Institute for Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/87056.
Gieseman, Oksana, and Shauna Hallmark Iowa Highway Research Board History Book Development [Tech Transfer Summary]. Iowa State University. Institute for Transportation, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/87056.
The purpose of the Michigan Department of Transportation (MDOT) Unmanned Aircraft Systems (UAS) Communications Mesh Test Deployment project was to evaluate the feasibility of using short-range wireless mesh networks to support Beyond Visual Line of Sight (BVLOS) operations for UAS. The project focused on integrating Dedicated Short-Range Communicat
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Wheeler, P., Organ, A., Hou, E., Van Tassel, E., Perry, F., Esselman, J., Rimanelli, J., Fehr, W., & Hannawa, B. (2025). Unmanned Aircraft Systems Communication Mesh Test Deployment (Report No. SPR-1753). Michigan Department of Transportation. Research Administration. https://rosap.ntl.bts.gov/view/dot/87071
Wheeler, Paul, Aaron Organ, Eric Hou, Evan Van Tassel, Frank Perry, Jared Esselman, Jon Rimanelli, Walt Fehr, and Brandon Hannawa. Unmanned Aircraft Systems Communication Mesh Test Deployment. Report no. SPR-1753. Michigan Department of Transportation. Research Administration, 2025. https://rosap.ntl.bts.gov/view/dot/87071.
Wheeler, Paul, et al. Unmanned Aircraft Systems Communication Mesh Test Deployment. Michigan Department of Transportation. Research Administration, 2025, Report no. SPR-1753, ROSA P. https://rosap.ntl.bts.gov/view/dot/87071.
The reported work includes the experiment testing of glass fiber reinforced polymer (GFRP) and steel reinforced concrete bridge barriers. A total of four reinforced concrete barriers were prepared, including three GFRP reinforced barriers and one mild steel reinforced barrier, and cast on two concrete slabs. Impact testing was conducted using a car
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Wei, C., Gadhe, M. K., Myers, J. J., & Wu, C. (2025). GFRP Reinforced Bridge Barriers: Impact Experiment (Report No. cmr 25-010). Missouri. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/85332
Wei, Congjie, Manish Kumar Gadhe, John J. Myers, and Chenglin Wu. GFRP Reinforced Bridge Barriers: Impact Experiment. Report no. cmr 25-010. Missouri. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/85332.
Wei, Congjie, et al. GFRP Reinforced Bridge Barriers: Impact Experiment. Missouri. Department of Transportation, 2025, Report no. cmr 25-010, ROSA P. https://rosap.ntl.bts.gov/view/dot/85332.
Truckers often struggle to find parking to take legally required breaks, which is not only an inconvenience for drivers, but also poses a safety risk for the motoring public. MnDOT is testing a detection system to identify the number of available truck parking spaces at the Heath Creek Rest Area (Northbound) located at M.P. 68.1 North of Faribault
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Minnesota. Department of Transportation (2025). Project Summary: Heath Creek Truck Parking (Report No. 2025-44). Minnesota. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/87596
Minnesota. Department of Transportation. Project Summary: Heath Creek Truck Parking. Report no. 2025-44. Minnesota. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/87596.
Minnesota. Department of Transportation Project Summary: Heath Creek Truck Parking. Minnesota. Department of Transportation, 2025, Report no. 2025-44, ROSA P. https://rosap.ntl.bts.gov/view/dot/87596.
Air pollution from fugitive dust poses a significant health risk to the population in rural and arid regions. Conventional chloride-based suppressants offer temporary dust control, leading to soil contamination and infrastructure corrosion. This study proposes the synthesis of a starch-based powder that regenerates into a hydrogel for dust mitigati
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Yellavajjala, R. K., & Hesami, M. (2025). An Economical and Sustainable Dust Suppressant for Gravel Roads (Report No. IHRB Project TR-813). Iowa Highway Research Board. https://rosap.ntl.bts.gov/view/dot/87606
Yellavajjala, Ravi Kiran and Maedeh Hesami. An Economical and Sustainable Dust Suppressant for Gravel Roads. Report no. IHRB Project TR-813. Iowa Highway Research Board, 2025. https://rosap.ntl.bts.gov/view/dot/87606.
Yellavajjala, Ravi Kiran, and Maedeh Hesami An Economical and Sustainable Dust Suppressant for Gravel Roads. Iowa Highway Research Board, 2025, Report no. IHRB Project TR-813, ROSA P. https://rosap.ntl.bts.gov/view/dot/87606.
Although the Highway Capacity Manual (HCM) provides default values for its methodologies, it also states that these values represent typical national values and that conditions within a state, region, or community may differ. When default values are applied frequently in analyses, the use of local default values can reduce the uncertainty in the an
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Rahman, M. A., Moomen, M., & Junaed, S. (2025). Estimating HCM Default Parameters for Louisiana (Report No. FHWA/LA.25/715). Louisiana Transportation Research Center. https://rosap.ntl.bts.gov/view/dot/86117
Rahman, M Ashifur, Milhan Moomen, and Siam Junaed. Estimating HCM Default Parameters for Louisiana. Report no. FHWA/LA.25/715. Louisiana Transportation Research Center, 2025. https://rosap.ntl.bts.gov/view/dot/86117.
Rahman, M Ashifur, et al. Estimating HCM Default Parameters for Louisiana. Louisiana Transportation Research Center, 2025, Report no. FHWA/LA.25/715, ROSA P. https://rosap.ntl.bts.gov/view/dot/86117.
The reported work includes the experiment testing of glass fiber reinforced polymer (GFRP) and steel reinforced concrete bridge barriers. A total of four reinforced concrete barriers were prepared, including three GFRP reinforced barriers and one mild steel reinforced barrier, and cast on two concrete slabs. Impact testing was conducted using a car
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Wu, Chenglin. GFRP Reinforced Bridge Barriers: Impact Experiment [Summary]. Missouri. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/85333.
Wu, Chenglin GFRP Reinforced Bridge Barriers: Impact Experiment [Summary]. Missouri. Department of Transportation, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/85333.
This document is a technical summary and supplement to the Florida International University report, A Framework for Field Inspection of In-Service FRP Reinforced/Strengthened Concrete Bridge Elements (FIU- 800014727), available at https://rosap.ntl.bts.gov/view/dot/73333. The document additionally offers technical findings beyond those provided in
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Mehrabi, A., Dolati, S. S. K., Malla, P., Nanni, A., & Polanco, J. O. (2025). A Framework for Field Inspection of In-service FRP Reinforced/Strengthened Concrete Bridge Elements: Technical Summary (Report No. 800014727-2). Florida International University. https://rosap.ntl.bts.gov/view/dot/85145
Mehrabi, Armin, Seyed Saman Khedmatgozar Dolati, Pranit Malla, Antonio Nanni, and Jesus Ortiz Polanco. A Framework for Field Inspection of In-service FRP Reinforced/Strengthened Concrete Bridge Elements: Technical Summary. Report no. 800014727-2. Florida International University, 2025. https://rosap.ntl.bts.gov/view/dot/85145.
Mehrabi, Armin, et al. A Framework for Field Inspection of In-service FRP Reinforced/Strengthened Concrete Bridge Elements: Technical Summary. Florida International University, 2025, Report no. 800014727-2, ROSA P. https://rosap.ntl.bts.gov/view/dot/85145.
Transit is frequently treated as a financial burden rather than a public investment, where the value is assessed primarily in terms of ridership or farebox recovery. This framing misses a wide range of external benefits, including workforce participation, healthcare access, and local economic activity. Additionally, public discourse and scholarly r
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Sriraj, P. S., Jang, J., & Sreniawski, L. (2025). Return on Investment for Rural Demand-Response Transit in Illinois. University of Illinois at Chicago. Urban Transportation Center. https://rosap.ntl.bts.gov/view/dot/86614
Sriraj, P S, Jin Jang, and Lucas Sreniawski. Return on Investment for Rural Demand-Response Transit in Illinois. University of Illinois at Chicago. Urban Transportation Center, 2025. https://rosap.ntl.bts.gov/view/dot/86614.
Sriraj, P S, et al. Return on Investment for Rural Demand-Response Transit in Illinois. University of Illinois at Chicago. Urban Transportation Center, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/86614.
Existing design methodologies for concrete overlays often rely on outdated empirical approaches or complex mechanistic models that lack adequate field validation. This has resulted in a significant gap in practice, particularly the design of Continuously Reinforced Concrete Pavement (CRCP) overlays, for which no standardized procedure exists in man
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Koirala, N., Jabonero, C., Nyamuhokya, T., Goehl, D. C., & Won, M. (2025). Develop Design Details for CRCP Whitetopping and Unbonded Overlays (Report No. FHWA/TX-26/0-7148-1). Texas. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/86611
Koirala, Niwesh, Christopher Jabonero, Tito Nyamuhokya, Darlene C Goehl, and Moon Won. Develop Design Details for CRCP Whitetopping and Unbonded Overlays. Report no. FHWA/TX-26/0-7148-1. Texas. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/86611.
Koirala, Niwesh, et al. Develop Design Details for CRCP Whitetopping and Unbonded Overlays. Texas. Department of Transportation, 2025, Report no. FHWA/TX-26/0-7148-1, ROSA P. https://rosap.ntl.bts.gov/view/dot/86611.
The objective of this project was to develop a method to prevent errant motorists from entering the median openings between parallel bridge structures. This project identified characteristics that could be used to target potential sites for implementation of a median opening protection system (MOPS). In this identification process, the research tea
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Kovar, J. C., Loza, A., & Schroeder, W. J. L. (2025). Developing an Enhanced Protection of Median Openings Between Parallel Bridge Structures (Report No. FHWA/TX-25/0-7021-01-R1). Texas. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/86041
Kovar, James C., Alondra Loza, and William J. L Schroeder. Developing an Enhanced Protection of Median Openings Between Parallel Bridge Structures. Report no. FHWA/TX-25/0-7021-01-R1. Texas. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/86041.
Kovar, James C., et al. Developing an Enhanced Protection of Median Openings Between Parallel Bridge Structures. Texas. Department of Transportation, 2025, Report no. FHWA/TX-25/0-7021-01-R1, ROSA P. https://rosap.ntl.bts.gov/view/dot/86041.
High Friction Surface Treatments (HFST) are proven crash reduction technology. However, their high cost necessitates exploring the use of alternative materials. This study assessed the design and application of Ultra-High-Performance Concrete (UHPC) as an alternative to traditional epoxy resin-based binder for HFST. In addition, the use of local al
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Rangaraju, P., Maeger, K., & Biehl, A. (2025). Development and Use of Ultra-High-Performance Concrete (UHPC) as a High Friction Surface Treatment (HFST) on Pavements and Bridges (Report No. FHWA-SC-25-02). South Carolina. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/85371
Rangaraju, Prasad, Kyle Maeger, and Adam Biehl. Development and Use of Ultra-High-Performance Concrete (UHPC) as a High Friction Surface Treatment (HFST) on Pavements and Bridges. Report no. FHWA-SC-25-02. South Carolina. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/85371.
Rangaraju, Prasad, et al. Development and Use of Ultra-High-Performance Concrete (UHPC) as a High Friction Surface Treatment (HFST) on Pavements and Bridges. South Carolina. Department of Transportation, 2025, Report no. FHWA-SC-25-02, ROSA P. https://rosap.ntl.bts.gov/view/dot/85371.
This research study developed and evaluated prefabricated steel bridges made continuous for live load utilizing accelerated bridge construction (ABC). The project created a steel ABC transverse connection detail at the bridge piers that allows the structure to behave as simply supported for dead load and continuous for live load. This detail is rel
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Hurlebaus, S., Yarnold, M. T., Guo, J., Falcon, J., Mander, J. B., Sideris, P., Skillen, K., Weidner, J., & Cano, G. (2025). Development of a Continuous for Live Load Prefabricated Steel Accelerated Bridge Construction (ABC) Unit for Texas Bridges (Report No. FHWA/TX-25/0-7112-R1). Texas. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/86042
Hurlebaus, Stefan, Matthew T. Yarnold, Jiacai Guo, Joren Falcon, John B. Mander, Petros Sideris, Kinsey Skillen, Jeffrey Weidner, and Gibran Cano. Development of a Continuous for Live Load Prefabricated Steel Accelerated Bridge Construction (ABC) Unit for Texas Bridges. Report no. FHWA/TX-25/0-7112-R1. Texas. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/86042.
Hurlebaus, Stefan, et al. Development of a Continuous for Live Load Prefabricated Steel Accelerated Bridge Construction (ABC) Unit for Texas Bridges. Texas. Department of Transportation, 2025, Report no. FHWA/TX-25/0-7112-R1, ROSA P. https://rosap.ntl.bts.gov/view/dot/86042.
This guide equips public agencies with considerations to select, use, and evaluate cutting edges that deliver the best return on investment. Choosing the right cutting edge for snowplowing or blading gravel roadways is essential to maximize performance, reduce costs, and protect both roads and operators. The best blade depends on surface type, plow
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Minnesota Local Road Research Board (2025). Smart Selection of Cutting Edges: A Practical Guide for Minnesota’s Cities and Counties (Report No. 2025RIC10). Minnesota. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/87554
Minnesota Local Road Research Board. Smart Selection of Cutting Edges: A Practical Guide for Minnesota’s Cities and Counties. Report no. 2025RIC10. Minnesota. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/87554.
Minnesota Local Road Research Board Smart Selection of Cutting Edges: A Practical Guide for Minnesota’s Cities and Counties. Minnesota. Department of Transportation, 2025, Report no. 2025RIC10, ROSA P. https://rosap.ntl.bts.gov/view/dot/87554.
This research project expanded on the three previous LTRC geotechnical database efforts to improve and advance geotechnical data management within the Louisiana Department of Transportation and Development. This project facilitated the implementation of Bentley’s OpenGround Cloud (OpenGround). The project uploaded historical boring log images and d
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Gautreau, G. P. (2025). Geotechnical Database - Phase IV (Report No. FHWA/LA.25/714). Louisiana Transportation Research Center. https://rosap.ntl.bts.gov/view/dot/86115
Gautreau, Gavin P.. Geotechnical Database - Phase IV. Report no. FHWA/LA.25/714. Louisiana Transportation Research Center, 2025. https://rosap.ntl.bts.gov/view/dot/86115.
Gautreau, Gavin P. Geotechnical Database - Phase IV. Louisiana Transportation Research Center, 2025, Report no. FHWA/LA.25/714, ROSA P. https://rosap.ntl.bts.gov/view/dot/86115.
Pedestrian fatalities on high-speed, multi-lane roads in Texas, particularly in San Antonio, Houston, and Dallas, highlight an urgent need for focused interventions at midblock crossings. These sites often serve vulnerable populations and connect neighborhoods to transit, retail, and essential services, yet their safety challenges are magnified by
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Sharif, H. O., Joseph, J., Dessouky, S., Eid, E., & Weissmann, J. (2025). Select High Risk Pedestrian Midblock Crossings and Perform Safety Evaluations for Developing Pedestrian Crossings (Report No. FHWA/TX-26/0-7180-R1). University of Texas at San Antonio. Dept. of Civil and Environmental Engineering. https://rosap.ntl.bts.gov/view/dot/87500
Sharif, Hatim O., John Joseph, Samer Dessouky, Eslam Eid, and Jose Weissmann. Select High Risk Pedestrian Midblock Crossings and Perform Safety Evaluations for Developing Pedestrian Crossings. Report no. FHWA/TX-26/0-7180-R1. University of Texas at San Antonio. Dept. of Civil and Environmental Engineering, 2025. https://rosap.ntl.bts.gov/view/dot/87500.
Sharif, Hatim O., et al. Select High Risk Pedestrian Midblock Crossings and Perform Safety Evaluations for Developing Pedestrian Crossings. University of Texas at San Antonio. Dept. of Civil and Environmental Engineering, 2025, Report no. FHWA/TX-26/0-7180-R1, ROSA P. https://rosap.ntl.bts.gov/view/dot/87500.
The durability of concrete structures is dependent on the restrained shrinkage behavior of the mix: therefore, evaluating mixtures with different aggregates and mitigation measures is critical. The aim of this document is to evaluate and compare concrete mixture designs using granite and limestone aggregates in combination with different mitigation
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Perez Buenfil, S., Higgins, J., Pinto, C. G. F., & Tanner, J. E. (2025). Evaluation Of Concrete Bridge Deck Mixtures Using Shrinkage-Ring Tests (Report No. WY2504F). Wyoming. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/87075
Perez Buenfil, Shamel, John Higgins, Cesar Gerardo Freyre Pinto, and Jennifer Eisenhauer Tanner. Evaluation Of Concrete Bridge Deck Mixtures Using Shrinkage-Ring Tests. Report no. WY2504F. Wyoming. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/87075.
Perez Buenfil, Shamel, et al. Evaluation Of Concrete Bridge Deck Mixtures Using Shrinkage-Ring Tests. Wyoming. Department of Transportation, 2025, Report no. WY2504F, ROSA P. https://rosap.ntl.bts.gov/view/dot/87075.
United States. Department of the Interior. National Park Service. Washington Area Support Office
2025-07-01
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The 2024 NPS Transit Inventory and Performance Report communicates the service-wide outcomes and status of National Park Service (NPS) transit systems. This comprehensive listing has been compiled annually in this format since 2012 and covers on- and off-road, waterborne, and airborne systems. The inventory establishes a working definition of NPS t
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United States. Department of the Interior. National Park Service. Washington Area Support Office (2025). NPS National Transit Inventory and Performance Report, 2024 (Report No. NPSG 999/197637). United States. Department of the Interior. National Park Service. https://rosap.ntl.bts.gov/view/dot/85844
United States. Department of the Interior. National Park Service. Washington Area Support Office. NPS National Transit Inventory and Performance Report, 2024. Report no. NPSG 999/197637. United States. Department of the Interior. National Park Service, 2025. https://rosap.ntl.bts.gov/view/dot/85844.
United States. Department of the Interior. National Park Service. Washington Area Support Office NPS National Transit Inventory and Performance Report, 2024. United States. Department of the Interior. National Park Service, 2025, Report no. NPSG 999/197637, ROSA P. https://rosap.ntl.bts.gov/view/dot/85844.
The Highway Division of the Iowa Department of Transportation (Iowa DOT) engages in research and development for two reasons: first, to find workable solutions to the many problems that require more than ordinary, routine investigation; and second, to identify and implement improved engineering and management practices. Detailed information on each
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Gieseman, O., Hallmark, S., Crippes, C., Haenlein, B., Hoermann, A., Hunsinger, P., & Funston, N. (2025). Iowa Highway Research Board: 2000–2024. Iowa Highway Research Board. https://rosap.ntl.bts.gov/view/dot/87055
Gieseman, Oksana, Shauna Hallmark, Christinia Crippes, Brandy Haenlein, Alicia Hoermann, Peter Hunsinger, and Neeve Funston. Iowa Highway Research Board: 2000–2024. Iowa Highway Research Board, 2025. https://rosap.ntl.bts.gov/view/dot/87055.
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