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.
The escalating number of injuries and fatalities among cyclists is a pressing safety concern. In the United States, communities are actively seeking strategies to boost cyclist safety, with some states implementing bike-specific policies, such as stop-as-yield laws, to support cyclists. Stop-as-yield laws allow cyclists to treat stop signs as yield
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Mahdinia, I., Griswold, J. B., Unda, R., Sohrabi, S., & Grembek, O. (2024). Evaluate the Safety Effects of Adopting a Stop-as-Yield Law for Cyclists in California (Report No. UC-ITS-2023-18). University of California Institute of Transportation Studies. https://doi.org/10.7922/G2M9070W
Mahdinia, Iman, Julia B Griswold, Rafael Unda, Soheil Sohrabi, and Offer Grembek. Evaluate the Safety Effects of Adopting a Stop-as-Yield Law for Cyclists in California. Report no. UC-ITS-2023-18. University of California Institute of Transportation Studies, 2024. https://doi.org/10.7922/G2M9070W.
Mahdinia, Iman, et al. Evaluate the Safety Effects of Adopting a Stop-as-Yield Law for Cyclists in California. University of California Institute of Transportation Studies, 2024, Report no. UC-ITS-2023-18, ROSA P. https://doi.org/10.7922/G2M9070W.
Title 14 of the Code of Federal Regulations defines regulations that are intended to protect aircraft occupants in the event of a survivable civil aircraft crash. The standards for emergency landing conditions (25.562) were developed with a focus primarily on forward-facing seats, although the rules apply to all seats regardless of installation ori
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Abdelrahman, M. (2024). Friction Enhancements to Asphalt Pavement Surfaces [Research Summary]. Missouri. Department of Transportation. Construction and Materials Division. https://rosap.ntl.bts.gov/view/dot/77702
Abdelrahman, Magdy. Friction Enhancements to Asphalt Pavement Surfaces [Research Summary]. Missouri. Department of Transportation. Construction and Materials Division, 2024. https://rosap.ntl.bts.gov/view/dot/77702.
Abdelrahman, Magdy Friction Enhancements to Asphalt Pavement Surfaces [Research Summary]. Missouri. Department of Transportation. Construction and Materials Division, 2024, ROSA P. https://rosap.ntl.bts.gov/view/dot/77702.
Crashes related to barrier end treatments and impact attenuators generally have higher severity levels than those colliding with barrier faces. To select the most effective end treatments, the in-service safety evaluation of such end treatments under various operational conditions was needed. This study linked 7 years of crash records with the corr
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Pineda-Mendez, R. A., Guo, Q., Romero, M. A., & Tarko, A. P. (2024). In-Service Safety Evaluation of Indiana Impact Attenuators and Barrier End Treatments (Report No. FHWA/IN/JTRP-2024/24). Purdue University. Joint Transportation Research Program. https://doi.org/10.5703/1288284317765
Pineda-Mendez, Raul A, Qiming Guo, Mario A. Romero, and Andrew P. Tarko. In-Service Safety Evaluation of Indiana Impact Attenuators and Barrier End Treatments. Report no. FHWA/IN/JTRP-2024/24. Purdue University. Joint Transportation Research Program, 2024. https://doi.org/10.5703/1288284317765.
Pineda-Mendez, Raul A, et al. In-Service Safety Evaluation of Indiana Impact Attenuators and Barrier End Treatments. Purdue University. Joint Transportation Research Program, 2024, Report no. FHWA/IN/JTRP-2024/24, ROSA P. https://doi.org/10.5703/1288284317765.
When speed limits are set via an engineering speed zone study, the operating speed for a site is needed. This research project investigated whether probe speed data (rather than speeds measured in the field) could reasonably be used in a speed zone study. The idea for using probe speed data is to develop conversion equations that would convert an a
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Fitzpatrick, K., Kutela, B., Park, E. S., Pratt, M. P., Venglar, S. P., & Le, M. (2024). Using Vehicle Probe Data to Evaluate Speed Limits [Project Summary] (Report No. 0-7156). Texas. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/78980
Fitzpatrick, Kay, Boniphace Kutela, Eun Sug Park, Michael P. Pratt, Steven P. Venglar, and Minh Le. Using Vehicle Probe Data to Evaluate Speed Limits [Project Summary]. Report no. 0-7156. Texas. Department of Transportation, 2024. https://rosap.ntl.bts.gov/view/dot/78980.
Fitzpatrick, Kay, et al. Using Vehicle Probe Data to Evaluate Speed Limits [Project Summary]. Texas. Department of Transportation, 2024, Report no. 0-7156, ROSA P. https://rosap.ntl.bts.gov/view/dot/78980.
The design of J-turn intersections has gained its prevalence in Missouri due to their demonstrated safety benefits. However, with the growing number of J-turns and the availability of more crash data, there is a renewed need to deepen the understanding of the safety performance of J-turns. This study presents a comprehensive safety evaluation of J-
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Edara, P. (2024). Safety Evaluation of J-turn Intersections in Missouri [Research Brief]. Missouri. Department of Transportation. Construction and Materials Division. https://rosap.ntl.bts.gov/view/dot/77598
Edara, Praveen. Safety Evaluation of J-turn Intersections in Missouri [Research Brief]. Missouri. Department of Transportation. Construction and Materials Division, 2024. https://rosap.ntl.bts.gov/view/dot/77598.
Edara, Praveen Safety Evaluation of J-turn Intersections in Missouri [Research Brief]. Missouri. Department of Transportation. Construction and Materials Division, 2024, ROSA P. https://rosap.ntl.bts.gov/view/dot/77598.
In Oregon, asphalt cracking is the primary distress mode, necessitating costly rehabilitation and maintenance. Cracking failures around longitudinal joints (especially on roadway sections with centerline rumble strips) have been an important issue in Oregon, affecting the overall long-term performance of the Oregon roadway network. Longitudinal joi
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Chitnis, V., Sukhija, M., & Coleri, E. (2024). Constructing High-Density Longitudinal Joints To Improve Pavement Longevity (Report No. FHWA-OR-RD-24-10). Oregon Department of Transportation. Research Section. https://rosap.ntl.bts.gov/view/dot/76481
Chitnis, Vipul, Mayank Sukhija, and Erdem Coleri. Constructing High-Density Longitudinal Joints To Improve Pavement Longevity. Report no. FHWA-OR-RD-24-10. Oregon Department of Transportation. Research Section, 2024. https://rosap.ntl.bts.gov/view/dot/76481.
Chitnis, Vipul, et al. Constructing High-Density Longitudinal Joints To Improve Pavement Longevity. Oregon Department of Transportation. Research Section, 2024, Report no. FHWA-OR-RD-24-10, ROSA P. https://rosap.ntl.bts.gov/view/dot/76481.
While head-on crashes generally constitute a small proportion of total crash occurrences, they often result in fatal and incapacitating injuries. As a result, many agencies are exploring strategies to mitigate head-on crashes and resulting injuries. This research examined head-on crashes that occurred in Florida Department of Transportation (FDOT)
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Alluri, P., Gattupal, H., Nayem, H., Shita, H., & Angel, M. (2024). Strategies to Address Head-On Crashes. Florida. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/88526
Alluri, Priyanka, Harsha Gattupal, HM Nayem, Hellen Shita, and Michelle Angel. Strategies to Address Head-On Crashes. Florida. Department of Transportation, 2024. https://rosap.ntl.bts.gov/view/dot/88526.
Thousands of miles of permeable friction course (PFC) pavements have performed well for the last 10 to 15 years on Texas highways. PFC pavement reduces hydroplaning, splash and spray, and pavement noise and improves ride quality and safety in wet weather. Hundreds of miles of PFC pavements are now at the end of their service life and need to be reh
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Arámbula-Mercado, E., Estakhri, C., Jurado-Paez, C., & Nyamuhokya, T. (2024). Design and Rehabilitation Strategies for Permeable Friction Course Pavements (Report No. FHWA/TX-23/0-7110-R1). Texas Department of Transportation. Research and Technology Implementation Office. https://rosap.ntl.bts.gov/view/dot/76749
Arámbula-Mercado, Edith, Cindy Estakhri, Camilo Jurado-Paez, and Tito Nyamuhokya. Design and Rehabilitation Strategies for Permeable Friction Course Pavements. Report no. FHWA/TX-23/0-7110-R1. Texas Department of Transportation. Research and Technology Implementation Office, 2024. https://rosap.ntl.bts.gov/view/dot/76749.
Arámbula-Mercado, Edith, et al. Design and Rehabilitation Strategies for Permeable Friction Course Pavements. Texas Department of Transportation. Research and Technology Implementation Office, 2024, Report no. FHWA/TX-23/0-7110-R1, ROSA P. https://rosap.ntl.bts.gov/view/dot/76749.
There is growing interest in the use of hydrogen as a transportation fuel but the environmental benefits of using hydrogen depend critically on how it is produced and distributed. Leading alternatives to using fossil natural gas to make hydrogen through the conventional method of steam methane reforming include using electrolyzers to split water in
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Lipman, T., Busch, P., Collins, S., Horvath, A., Kendall, A., Coffee, D., & Kong, D. (2024). Moving Beyond the Colors: The Full Life-Cycle Emissions of Hydrogen Production Pathways for California (Report No. UC-ITS-RIMI-3P). University of California Institute of Transportation Studies. https://doi.org/10.7922/G26Q1VKR
Lipman, Timothy, Pablo Busch, Stephanie Collins, Arpad Horvath, Alissa Kendall, Daniel Coffee, and David Kong. Moving Beyond the Colors: The Full Life-Cycle Emissions of Hydrogen Production Pathways for California. Report no. UC-ITS-RIMI-3P. University of California Institute of Transportation Studies, 2024. https://doi.org/10.7922/G26Q1VKR.
Lipman, Timothy, et al. Moving Beyond the Colors: The Full Life-Cycle Emissions of Hydrogen Production Pathways for California. University of California Institute of Transportation Studies, 2024, Report no. UC-ITS-RIMI-3P, ROSA P. https://doi.org/10.7922/G26Q1VKR.
The recent availability of the state-wide large-scale real-time traffic database, traffic incident database, and road crash database has enabled more efficient traffic incident management. This project aims to assist traffic incident management (TIM) in Alabama by leveraging three large-scale real-time databases maintained by ALDOT including the AL
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Liu, J., Zhang, Z., Hainen, A., Jones, S., Barnett, T., & Steve, B. (2024). Proactive Traffic Incident Management in Alabama. Alabama. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/78177
Liu, Jun, Zihe Zhang, Alex Hainen, Steven Jones, Tim Barnett, and Burdette Steve. Proactive Traffic Incident Management in Alabama. Alabama. Department of Transportation, 2024. https://rosap.ntl.bts.gov/view/dot/78177.
Liu, Jun, et al. Proactive Traffic Incident Management in Alabama. Alabama. Department of Transportation, 2024, ROSA P. https://rosap.ntl.bts.gov/view/dot/78177.
This report summarizes the research on enhancing the current inspection protocols for MassDOT using 3D scanning technologies. The first part of the report presents a thorough review of the current methods using 3D scanning techniques for bridge inspection. The report also includes laboratory and field scans on corroded beam ends. The research team
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Provost, A., Gerasimidis, S., Ai, C., & Brena, S. (2024). Development of Improved Inspection Techniques Using LiDAR for Deteriorated Steel Beam Ends. Massachusetts. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/77737
Provost, Aidan, Simos Gerasimidis, Chengbo Ai, and Sergio Brena. Development of Improved Inspection Techniques Using LiDAR for Deteriorated Steel Beam Ends. Massachusetts. Department of Transportation, 2024. https://rosap.ntl.bts.gov/view/dot/77737.
Provost, Aidan, et al. Development of Improved Inspection Techniques Using LiDAR for Deteriorated Steel Beam Ends. Massachusetts. Department of Transportation, 2024, ROSA P. https://rosap.ntl.bts.gov/view/dot/77737.
In recent years there has been a significant increase of interest in additive manufacturing (AM; also frequently referred to as 3D printing), yet AM is largely unexplored within infrastructure projects. By harnessing the new capabilities of AM, researchers have managed to access unprecedented new design capabilities and operational flexibility (e.g
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Schagen, B. D., Zhang, S., Hart, J. A., Chen, W., Quinlan, H., & Gerasimidis, S. (2024). Feasibility of 3D Printing Applications for Highway Infrastructure Construction and Maintenance (Report No. 24-058). Massachusetts. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/77736
Schagen, B D, S. Zhang, John A Hart, Wen Chen, Haden Quinlan, and Simos Gerasimidis. Feasibility of 3D Printing Applications for Highway Infrastructure Construction and Maintenance. Report no. 24-058. Massachusetts. Department of Transportation, 2024. https://rosap.ntl.bts.gov/view/dot/77736.
Schagen, B D, et al. Feasibility of 3D Printing Applications for Highway Infrastructure Construction and Maintenance. Massachusetts. Department of Transportation, 2024, Report no. 24-058, ROSA P. https://rosap.ntl.bts.gov/view/dot/77736.
The primary objective of this project was to understand Indiana resident’s perspectives on electric vehicles (EVs), including adoption incentives and barriers, awareness of adoption incentives, charging preferences, and general travel patterns. A secondary objective was to establish a framework for identifying EV users, detailing their trips, and g
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Gkritza, K., & Ukkusuri, S. (2024). Electric Vehicles: Public Perceptions, Expectations, and Willingness-to-Pay [Summary]. Purdue University. Joint Transportation Research Program. https://rosap.ntl.bts.gov/view/dot/80365
Gkritza, Konstantina and Satish Ukkusuri. Electric Vehicles: Public Perceptions, Expectations, and Willingness-to-Pay [Summary]. Purdue University. Joint Transportation Research Program, 2024. https://rosap.ntl.bts.gov/view/dot/80365.
Gkritza, Konstantina, and Satish Ukkusuri Electric Vehicles: Public Perceptions, Expectations, and Willingness-to-Pay [Summary]. Purdue University. Joint Transportation Research Program, 2024, ROSA P. https://rosap.ntl.bts.gov/view/dot/80365.
A comprehensive full-scale field monitoring program involving different types of geosynthetic reinforcement products was successfully implemented. The monitoring system included asphalt strain gauges, thermocouples, geophones, and moisture sensors. The monitoring results indicate that all asphalt overlay sections reinforced with geosynthetic reinfo
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Kumar, V. V., Roodi, G. H., Sankaranarayanan, S., Saxena, A., Blake, C., & Zornberg, J. G. (2024). Geosynthetic Reinforcement in Asphalt Overlays for Increased Roadway Structural Capacity (Report No. FHWA/TX-25/0-7002-1). Texas Department of Transportation. Research and Technology Implementation Office. https://rosap.ntl.bts.gov/view/dot/78817
Kumar, V Vinay, Gholam H. Roodi, Subramanian Sankaranarayanan, Ashray Saxena, Calvin Blake, and Jorge G. Zornberg. Geosynthetic Reinforcement in Asphalt Overlays for Increased Roadway Structural Capacity. Report no. FHWA/TX-25/0-7002-1. Texas Department of Transportation. Research and Technology Implementation Office, 2024. https://rosap.ntl.bts.gov/view/dot/78817.
Kumar, V Vinay, et al. Geosynthetic Reinforcement in Asphalt Overlays for Increased Roadway Structural Capacity. Texas Department of Transportation. Research and Technology Implementation Office, 2024, Report no. FHWA/TX-25/0-7002-1, ROSA P. https://rosap.ntl.bts.gov/view/dot/78817.
Smart work zones utilize technologies and strategies to enhance transportation safety, mobility, traveler satisfaction, and even construction/maintenance productivity through and around work zones. To date, there have been both positive and negative experiences with the technology. The objectives of this study were to determine why some smart work
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Ullman, G., Miller, M., Albert, D., Le, M., Crawford, J., & Brydia, R. (2024). Improving Smart Work Zone Deployments in Texas (Report No. FHWA/TX-24/0-7118-R1). Texas Department of Transportation. Research and Technology Implementation Office. https://rosap.ntl.bts.gov/view/dot/76750
Ullman, Gerald, Matt Miller, Debbie Albert, Minh Le, Jason Crawford, and Robert Brydia. Improving Smart Work Zone Deployments in Texas. Report no. FHWA/TX-24/0-7118-R1. Texas Department of Transportation. Research and Technology Implementation Office, 2024. https://rosap.ntl.bts.gov/view/dot/76750.
Ullman, Gerald, et al. Improving Smart Work Zone Deployments in Texas. Texas Department of Transportation. Research and Technology Implementation Office, 2024, Report no. FHWA/TX-24/0-7118-R1, ROSA P. https://rosap.ntl.bts.gov/view/dot/76750.
The primary objective of this project was to understand Indiana resident’s perspectives on electric vehicles (EVs), including adoption incentives and barriers, awareness of adoption incentives, charging preferences, and general travel patterns. A secondary objective was to establish a framework for identifying EV users, detailing their trips, and g
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Moras, B. C. K., Chen, X., Wijaya, K. C., Ukkusuri, S., Labi, S., & Gkritza, K. (2024). Electric Vehicles: Public Perceptions, Expectations, and Willingness-to-Pay (Report No. FHWA/IN/JTRP-2024/25). Purdue University. Joint Transportation Research Program. https://doi.org/10.5703/1288284317766
Moras, Bruno Cesar Krause, Xiaowei Chen, Kenny Chandra Wijaya, Satish Ukkusuri, Samuel Labi, and Konstantina Gkritza. Electric Vehicles: Public Perceptions, Expectations, and Willingness-to-Pay. Report no. FHWA/IN/JTRP-2024/25. Purdue University. Joint Transportation Research Program, 2024. https://doi.org/10.5703/1288284317766.
Moras, Bruno Cesar Krause, et al. Electric Vehicles: Public Perceptions, Expectations, and Willingness-to-Pay. Purdue University. Joint Transportation Research Program, 2024, Report no. FHWA/IN/JTRP-2024/25, ROSA P. https://doi.org/10.5703/1288284317766.
Floating bus stops are used to facilitate transit operations and enhance accessibility by allowing in-lane stops. A bike channel separates the platform from the sidewalk, preventing conflicts between buses and bicycles but potentially causing conflicts between bicyclists and bus riders. The objectives of this research are to: 1) investigate bus rid
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Christofa, E., Ai, C., Furth, P. G., Yang, Y. M., Ahammed, D. T., & Obeng-Amoako, N. D. (2024). Accessible Bus Stop Design in the Presence of Bike Lanes (Report No. 24-060). Massachusetts. Dept. of Transportation. Office of Transportation Planning. https://rosap.ntl.bts.gov/view/dot/79327
Christofa, Eleni, Chengbo Ai, Peter G. Furth, Yu-Min Yang, Dewan Tanvir Ahammed, and Nathan David Obeng-Amoako. Accessible Bus Stop Design in the Presence of Bike Lanes. Report no. 24-060. Massachusetts. Dept. of Transportation. Office of Transportation Planning, 2024. https://rosap.ntl.bts.gov/view/dot/79327.
Christofa, Eleni, et al. Accessible Bus Stop Design in the Presence of Bike Lanes. Massachusetts. Dept. of Transportation. Office of Transportation Planning, 2024, Report no. 24-060, ROSA P. https://rosap.ntl.bts.gov/view/dot/79327.
In 2021, manual thermal brake screening systems were installed at Lyon EB and Rowan County weigh stations. Two additional units were installed at Laurel SB and Scott County weigh stations the following year. Although this system is called a thermal brake screening system, its thermal camera images are used to find both brake and tire-related violat
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Koo, J., Leddy, D., & Walton, J. (2024). Evaluation of Manual Thermal Brake Screening Systems (Report No. KTC-25-07). University of Kentucky Transportation Center. https://doi.org/10.13023/ktc.rr.2025.07
Koo, Jeeyen, David Leddy, and Jennifer Walton. Evaluation of Manual Thermal Brake Screening Systems. Report no. KTC-25-07. University of Kentucky Transportation Center, 2024. https://doi.org/10.13023/ktc.rr.2025.07.
Koo, Jeeyen, et al. Evaluation of Manual Thermal Brake Screening Systems. University of Kentucky Transportation Center, 2024, Report no. KTC-25-07, ROSA P. https://doi.org/10.13023/ktc.rr.2025.07.
To accommodate passing bicyclists and transit riders accessing the new FX2 TriMet bus rapid transit line in Portland, TriMet worked with the City of Portland and broad group of stakeholders and partners to design and implement a new shared use bus platform that incorporates a sidewalk / platform level bike lane. The SE Division corridor was designa
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McNeil, N., Kothuri, S., Dill, J., Monsere, C., Kim, K., Ma, J., Yates, E., & Plotts, J. (2024). FX2-Division: Shared Bicycle and Pedestrian Platform Evaluation. Transportation Research and Education Center (TREC). https://rosap.ntl.bts.gov/view/dot/78771
McNeil, Nathan, Sirisha Kothuri, Jennifer Dill, Christopher Monsere, Kyuri Kim, Jiahui Ma, Elizabeth Yates, and Jules Plotts. FX2-Division: Shared Bicycle and Pedestrian Platform Evaluation. Transportation Research and Education Center (TREC), 2024. https://rosap.ntl.bts.gov/view/dot/78771.
McNeil, Nathan, et al. FX2-Division: Shared Bicycle and Pedestrian Platform Evaluation. Transportation Research and Education Center (TREC), 2024, ROSA P. https://rosap.ntl.bts.gov/view/dot/78771.
This third annual report seeks to share our programmatic growth, successes, and areas for improvement with our partners and the community. We are proud of our work, the work of our partners, and are excited for our future, and we think you will be as well.
Harriet, N., & Madsen, M. (2024). GoGallatin Annual Report: July 1, 2023 – June 30, 2024 (Report No. 4WA231GoGal). Montana State University. Western Transportation Institute. https://rosap.ntl.bts.gov/view/dot/78449
Harriet, Nathan and Matthew Madsen. GoGallatin Annual Report: July 1, 2023 – June 30, 2024. Report no. 4WA231GoGal. Montana State University. Western Transportation Institute, 2024. https://rosap.ntl.bts.gov/view/dot/78449.
Harriet, Nathan, and Matthew Madsen GoGallatin Annual Report: July 1, 2023 – June 30, 2024. Montana State University. Western Transportation Institute, 2024, Report no. 4WA231GoGal, ROSA P. https://rosap.ntl.bts.gov/view/dot/78449.
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