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.
WYDOT maintains a vast network consisting of Interstate, NHS and non-NHS roads. The existing infrastructure needs continues maintenance to keep in good condition and safe for users. To achieve this, WYDOT needs a considerable amount of funding every year and anticipates the demand for future maintenance through performance models. This future maint
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Aleadelat, W., Ksaibati, K., Khan, S., Boake, B., Cawley, B., & Hafez, M. (2025). Review of the Current Transportation Asset Management Practices in Wyoming [Data Management Plan]. Wyoming. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/85852
Aleadelat, Waleed, Khaled Ksaibati, Shahbaz Khan, Bernard Boake, Bryan Cawley, and Marwan Hafez. Review of the Current Transportation Asset Management Practices in Wyoming [Data Management Plan]. Wyoming. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/85852.
Aleadelat, Waleed, et al. Review of the Current Transportation Asset Management Practices in Wyoming [Data Management Plan]. Wyoming. Department of Transportation, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/85852.
E-bike lending libraries are emerging as a potential tool to promote sustainable transportation, reduce greenhouse gas emissions, and enhance mobility equity across communities in the United States. By offering residents the opportunity to borrow e-bikes for periods ranging from a couple of hours to several months, these programs help address barri
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MacArthur, J., Miller, J., & Swain, I. (2025). E-bike Lending Libraries: Trends and Practices in The United States. Transportation Research and Education Center (TREC). https://rosap.ntl.bts.gov/view/dot/83378
MacArthur, John, Joshua Miller, and Isa Swain. E-bike Lending Libraries: Trends and Practices in The United States. Transportation Research and Education Center (TREC), 2025. https://rosap.ntl.bts.gov/view/dot/83378.
MacArthur, John, et al. E-bike Lending Libraries: Trends and Practices in The United States. Transportation Research and Education Center (TREC), 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/83378.
Nearly 30% of roads in the U.S. are unpaved, significantly impacting rural connectivity with Nebraska alone having approximately 75% unpaved roads. This study systematically evaluates local materials to improve gravel road performance, reduce maintenance frequency, and decrease financial burdens on counties. Survey responses revealed that nearly 70
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Cetin, B., Cetin, K., Vangaveeti, C. S., Bulduk, M., & Asif, M. M. (2025). Gravel Road Performance Enhancements (Report No. SPR FY23(014)). Nebraska. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/84548
Cetin, Bora, Kristen Cetin, Charan Sai Vangaveeti, Mehdi Bulduk, and Md Mahir Asif. Gravel Road Performance Enhancements. Report no. SPR FY23(014). Nebraska. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/84548.
Cetin, Bora, et al. Gravel Road Performance Enhancements. Nebraska. Department of Transportation, 2025, Report no. SPR FY23(014), ROSA P. https://rosap.ntl.bts.gov/view/dot/84548.
Transit services connect people to jobs and opportunities, fostering vibrant communities and multimodal travel along service corridors. A transit right-of-way (ROW) can help buses bypass congestion and stay on schedule. Many studies have proved that transit ROWs effectively improve service reliability and reduce user costs. However, these studies o
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Song, Y. (2025). Research Summary: Increasing Service Reliability by Adding a Dedicated Right of Way for Buses. Minnesota. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/87549
Song, Ying. Research Summary: Increasing Service Reliability by Adding a Dedicated Right of Way for Buses. Minnesota. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/87549.
Song, Ying Research Summary: Increasing Service Reliability by Adding a Dedicated Right of Way for Buses. Minnesota. Department of Transportation, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/87549.
Post-construction roadside soils often suffer from compaction, low fertility, and poor structure, challenging vegetation establishment and stormwater management. This study evaluates the effectiveness of organic amendments (OAs) and proprietary amendments as alternatives to traditional methods. The study involves greenhouse experiments (pot and mes
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Cetin, B., Saltali, O., Farina, A., Thejaswini Pamuru, S., Coban, H. S., Aydilek, A. H., & Davis, A. P. (2025). Comparison of Compost and Proprietary Soil Amendments for Vegetation Establishment (Report No. 2025-22). Minnesota. Department of Transportation. https://hdl.handle.net/20.500.14153/mndot.17769
Cetin, Bora, Oguzhan Saltali, Angela Farina, Sai Thejaswini Pamuru, Haluk Sinan Coban, Ahmet H. Aydilek, and Allen P Davis. Comparison of Compost and Proprietary Soil Amendments for Vegetation Establishment. Report no. 2025-22. Minnesota. Department of Transportation, 2025. https://hdl.handle.net/20.500.14153/mndot.17769.
Cetin, Bora, et al. Comparison of Compost and Proprietary Soil Amendments for Vegetation Establishment. Minnesota. Department of Transportation, 2025, Report no. 2025-22, ROSA P. https://hdl.handle.net/20.500.14153/mndot.17769.
Research results indicate that 4-ft centerline buffers on four-lane highways are highly effective in reducing lane departure crashes.
Texas A&M Transportation Institute (2025). Centerline Buffers on Four-Lane Undivided Roadways [Technical Brief]. Texas. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/83533
Texas A&M Transportation Institute. Centerline Buffers on Four-Lane Undivided Roadways [Technical Brief]. Texas. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/83533.
Texas A&M Transportation Institute Centerline Buffers on Four-Lane Undivided Roadways [Technical Brief]. Texas. Department of Transportation, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/83533.
Skewed steel I-girder bridges present unique structural challenges due to their angled geometry, which affects load distribution and increases potential for fatigue and stress concentrations. Traditional connection methods, such as bent plate connections, can introduce flexibility, leading to reduced stability. FDOT is exploring Half-Round Bearing
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Mehrabi, A. (2025). Half-Round Bearing Stiffeners for Skewed Steel I-Girders [Brief] (Report No. BED65). Florida. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/84525
Mehrabi, Armin. Half-Round Bearing Stiffeners for Skewed Steel I-Girders [Brief]. Report no. BED65. Florida. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/84525.
Mehrabi, Armin Half-Round Bearing Stiffeners for Skewed Steel I-Girders [Brief]. Florida. Department of Transportation, 2025, Report no. BED65, ROSA P. https://rosap.ntl.bts.gov/view/dot/84525.
This study aimed to conduct a needs assessment and performance evaluation of Traffic Incident Management (TIM) in Louisiana and identify areas for TIM improvement. The study also aimed to assess interoperability as a solution to communication gaps. The research team achieved this by performing evaluations and assessments of Louisiana’s TIM and comm
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Moomen, M., Rahman, A., & Khan, W. A. (2025). Improved Incident Response through Coordinated, Interoperable Communications (Report No. FHWA/LA.25/705). Louisiana Transportation Research Center. https://rosap.ntl.bts.gov/view/dot/82245
Moomen, Milhan, Ashifur Rahman, and Waseem A Khan. Improved Incident Response through Coordinated, Interoperable Communications. Report no. FHWA/LA.25/705. Louisiana Transportation Research Center, 2025. https://rosap.ntl.bts.gov/view/dot/82245.
Moomen, Milhan, et al. Improved Incident Response through Coordinated, Interoperable Communications. Louisiana Transportation Research Center, 2025, Report no. FHWA/LA.25/705, ROSA P. https://rosap.ntl.bts.gov/view/dot/82245.
This study evaluated the effects of using Warm Mix Asphalt (WMA) technologies to reduce asphalt production temperatures on energy consumption and pavement performance in Alabama. Two field experiments were conducted. The first compared two chemical WMA mixtures to a conventional Hot Mix Asphalt (HMA), while the second used one of the WMA technologi
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Sadeghi, M., Bairgi, B. K., Hartzog, Z., Gatiganti, S., Tran, N., Dylla, H. L., & Bowers, B. (2025). Technical Assistance for Quantifying Emissions from Asphalt Mixtures. Auburn University. National Center for Asphalt Technology. https://rosap.ntl.bts.gov/view/dot/84685
Sadeghi, M, B K Bairgi, Z Hartzog, S Gatiganti, N Tran, Heather L. Dylla, and B Bowers. Technical Assistance for Quantifying Emissions from Asphalt Mixtures. Auburn University. National Center for Asphalt Technology, 2025. https://rosap.ntl.bts.gov/view/dot/84685.
Sadeghi, M, et al. Technical Assistance for Quantifying Emissions from Asphalt Mixtures. Auburn University. National Center for Asphalt Technology, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/84685.
Protecting concrete bridge substructures against deterioration over time is an important aspect of bridge preservation, and it is routinely conducted by state departments of transportation. The application of coatings and sealers to protect bridge substructure concrete from corrosion is a common practice. However, a laboratory-based performance eva
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Mukhopadhyay, A. K., & Mistri, A. (2025). Evaluate Performance of Sealers and Coatings Applied to TxDOT Bridge Substructures (Report No. TxDOT/TX-25/0-7167-R1). Texas. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/83532
Mukhopadhyay, Anol K. and Abhijit Mistri. Evaluate Performance of Sealers and Coatings Applied to TxDOT Bridge Substructures. Report no. TxDOT/TX-25/0-7167-R1. Texas. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/83532.
Mukhopadhyay, Anol K., and Abhijit Mistri Evaluate Performance of Sealers and Coatings Applied to TxDOT Bridge Substructures. Texas. Department of Transportation, 2025, Report no. TxDOT/TX-25/0-7167-R1, ROSA P. https://rosap.ntl.bts.gov/view/dot/83532.
This report provides an in-depth synthesis of the economic impact assessment of transit services in the United States from 2003 to 2023, focusing on Benefit-Cost Analysis (BCA) and Economic Impact Analysis (EIA) methodologies. It examines their application in public transit systems and highlights geographical variations and trends. The report analy
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Peng, Z. R. (2025). A Synthesis of Economic Impact Assessment of Transit Services [Brief]. Florida Department of Transportation. https://rosap.ntl.bts.gov/view/dot/84602
Peng, Zhong-Ren. A Synthesis of Economic Impact Assessment of Transit Services [Brief]. Florida Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/84602.
Peng, Zhong-Ren A Synthesis of Economic Impact Assessment of Transit Services [Brief]. Florida Department of Transportation, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/84602.
Although the forecast rate of growth for truck vehicle miles traveled is roughly double the forecast rate of growth for passenger vehicle miles traveled, specific planning techniques to address truck freight planning needs are not widely known. Accordingly, to elevate the importance of truck freight within the regional planning process, this study
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Supporting Files
Miller, J. S., Parambil, N. V., & Alsumait, K. (2025). Increasing Regional Truck Freight Planning in Virginia (Report No. FHWA/VTRC 25-R15, VTRC 25-R15). Virginia. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/80405
Miller, John S, Nishara Vavitta Parambil, and Khaled Alsumait. Increasing Regional Truck Freight Planning in Virginia. Report no. FHWA/VTRC 25-R15, VTRC 25-R15. Virginia. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/80405.
Miller, John S, et al. Increasing Regional Truck Freight Planning in Virginia. Virginia. Department of Transportation, 2025, Report no. FHWA/VTRC 25-R15, VTRC 25-R15, ROSA P. https://rosap.ntl.bts.gov/view/dot/80405.
Posted speed limits (PSLs) are a highly complex issue involving engineering, human factors, and political and societal concerns. On a national level, recent research along with calls to change how speed limit are set, especially for city streets, have generated extensive discussion on future speed limit setting procedures. Recent Texas Department o
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Texas A&M Transportation Institute (2025). Setting Speed Limits: Spanish Version (Report No. Product 5-7049-01-P1, TTI: 5-7049-01). Texas. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/83541
Texas A&M Transportation Institute. Setting Speed Limits: Spanish Version. Report no. Product 5-7049-01-P1, TTI: 5-7049-01. Texas. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/83541.
Texas A&M Transportation Institute Setting Speed Limits: Spanish Version. Texas. Department of Transportation, 2025, Report no. Product 5-7049-01-P1, TTI: 5-7049-01, ROSA P. https://rosap.ntl.bts.gov/view/dot/83541.
The project aimed to determine the impact of adding additional virgin binders in consideration of recycled binder availability (RBA) on the performance of asphalt mixtures containing reclaimed asphalt pavements (RAP). To that end, a literature review was first conducted to select a suitable RBA value (i.e., 80%) for RBA mixtures in Florida, followe
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Yin, F. (2025). Determining the Effect on Asphalt Mixture Performance by Increasing New Asphalt Binder Content Due to Inactive RAP Binder in the Mixture [Brief]. Florida Department of Transportation. https://rosap.ntl.bts.gov/view/dot/84598
Yin, Fan. Determining the Effect on Asphalt Mixture Performance by Increasing New Asphalt Binder Content Due to Inactive RAP Binder in the Mixture [Brief]. Florida Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/84598.
Yin, Fan Determining the Effect on Asphalt Mixture Performance by Increasing New Asphalt Binder Content Due to Inactive RAP Binder in the Mixture [Brief]. Florida Department of Transportation, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/84598.
In this work the research team reports on the effectiveness of various techniques to mitigate Wi-Fi 5 interference on Vehicle-to-Everything communications and provide a means to reliably detect Wi-Fi 5 interference. Following previous work conducted in RP 22-18, the research team performed three research investigations in this new work. The first i
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Kihei, B., Grow, J., Oglesby, N., Prescott, M., Hatcher, G., Tello, M., Amoah, S., Murphy, K., Walker, W. P., & Iwejuo, A. (2025). Advanced 5.9GHz Interference Resiliency for Connected Vehicle Equipment (Report No. FHWA-GA-25-2316). Georgia. Department of Transportation. Office of Performance-Based Management & Research. https://rosap.ntl.bts.gov/view/dot/80401
Kihei, Billy, James Grow, Nakira Oglesby, Mackenzie Prescott, Grayson Hatcher, Marco Tello, Sam Amoah, Khason Murphy, William P. Walker, and Anthony Iwejuo. Advanced 5.9GHz Interference Resiliency for Connected Vehicle Equipment. Report no. FHWA-GA-25-2316. Georgia. Department of Transportation. Office of Performance-Based Management & Research, 2025. https://rosap.ntl.bts.gov/view/dot/80401.
Kihei, Billy, et al. Advanced 5.9GHz Interference Resiliency for Connected Vehicle Equipment. Georgia. Department of Transportation. Office of Performance-Based Management & Research, 2025, Report no. FHWA-GA-25-2316, ROSA P. https://rosap.ntl.bts.gov/view/dot/80401.
Pedestrian assets, particularly sidewalks, are highly susceptible to aging, adverse weather conditions, and suboptimal construction practices, often leading to rapid deterioration. This deterioration is often ignored due to the widespread misconception that pedestrian assets are low risk, resulting in many deteriorated sidewalks being left untreate
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CTC & Associates LLC (2025). Modeling and Predicting the Deterioration of Pedestrian Assets [Summary] (Report No. 2025-19RS). Minnesota. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/81861
CTC & Associates LLC. Modeling and Predicting the Deterioration of Pedestrian Assets [Summary]. Report no. 2025-19RS. Minnesota. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/81861.
CTC & Associates LLC Modeling and Predicting the Deterioration of Pedestrian Assets [Summary]. Minnesota. Department of Transportation, 2025, Report no. 2025-19RS, ROSA P. https://rosap.ntl.bts.gov/view/dot/81861.
Accurate remaining service life (RSL) prediction facilitates effective pavement maintenance strategies, extends service quality, and reduces costs. This study developed RSL prediction models for major distresses in INDOT pavement—including full-depth asphalt flexible, rigid, and composite pavement—using Falling Weight Deflectometer (FWD) and Intern
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Cho, S., Park, B., Zhang, C., & Haddock, J. E. (2025). Remaining Service Life Prediction of Indiana Pavements Using Mechanistic Methods (Report No. FHWA/IN/JTRP-2025/10). Purdue University. Joint Transportation Research Program. https://rosap.ntl.bts.gov/view/dot/88900
Cho, Seonghwan, Bongsuk Park, Cheng Zhang, and John E. Haddock. Remaining Service Life Prediction of Indiana Pavements Using Mechanistic Methods. Report no. FHWA/IN/JTRP-2025/10. Purdue University. Joint Transportation Research Program, 2025. https://rosap.ntl.bts.gov/view/dot/88900.
Cho, Seonghwan, et al. Remaining Service Life Prediction of Indiana Pavements Using Mechanistic Methods. Purdue University. Joint Transportation Research Program, 2025, Report no. FHWA/IN/JTRP-2025/10, ROSA P. https://rosap.ntl.bts.gov/view/dot/88900.
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
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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.
Non-motorized volumes at different locations in a transportation network are important data for understanding safety and travel needs for people who bike and walk. In Georgia, however, there are limited data about non-motorized volumes in transportation systems given, and in general, these modes volumes are difficult to predict due to high variabil
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Tien, I., Watkins, K. E., & Panik, R. T. (2025). Non-Motorized Count Program and Risk Factors Assessment (Report No. FHWA-GA-24-2109). Georgia. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/81806
Tien, Iris, Kari E. Watkins, and Rachael Thompson Panik. Non-Motorized Count Program and Risk Factors Assessment. Report no. FHWA-GA-24-2109. Georgia. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/81806.
Tien, Iris, et al. Non-Motorized Count Program and Risk Factors Assessment. Georgia. Department of Transportation, 2025, Report no. FHWA-GA-24-2109, ROSA P. https://rosap.ntl.bts.gov/view/dot/81806.
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