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.
Common complete street traffic signal timing strategies include leading pedestrian intervals, exclusive bicycle and pedestrian phasing, transit and bicycle queue jumps, and more. These countermeasures are utilized to curb pedestrian and bicycle crashes with vehicles; however, they often come at the expense of decreased travel efficiency. Safety and
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Reynolds, I., Qi, Y., Machemehl, R., & Neible, B. (2025). Traffic Signal Operations Supporting All Users (Report No. FHWA/TX-26/0-7209-1). University of Texas at Austin. Center for Transportation Research. https://rosap.ntl.bts.gov/view/dot/86886
Reynolds, Isabelle, Yue Qi, Randy Machemehl, and Bunny Neible. Traffic Signal Operations Supporting All Users. Report no. FHWA/TX-26/0-7209-1. University of Texas at Austin. Center for Transportation Research, 2025. https://rosap.ntl.bts.gov/view/dot/86886.
Reynolds, Isabelle, et al. Traffic Signal Operations Supporting All Users. University of Texas at Austin. Center for Transportation Research, 2025, Report no. FHWA/TX-26/0-7209-1, ROSA P. https://rosap.ntl.bts.gov/view/dot/86886.
The statewide driver traffic safety survey provides baseline and longitudinal metrics for the Highway Safety Division and others to use in understanding perceptions and self-reported behaviors related to focus issues. A core set of questions addresses nationally agreed upon priorities, including seat belts, impaired driving, and speeding. In additi
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Vachal, K., Kubas, A., & Andersen, J. (2025). North Dakota Statewide Traffic Safety Survey, 2025: Traffic Safety Performance Measures for State and Federal Agencies (Report No. 331). Upper Great Plains Transportation Institute. https://rosap.ntl.bts.gov/view/dot/86885
Vachal, Kimberly, Andrew Kubas, and Jaclyn Andersen. North Dakota Statewide Traffic Safety Survey, 2025: Traffic Safety Performance Measures for State and Federal Agencies. Report no. 331. Upper Great Plains Transportation Institute, 2025. https://rosap.ntl.bts.gov/view/dot/86885.
Vachal, Kimberly, et al. North Dakota Statewide Traffic Safety Survey, 2025: Traffic Safety Performance Measures for State and Federal Agencies. Upper Great Plains Transportation Institute, 2025, Report no. 331, ROSA P. https://rosap.ntl.bts.gov/view/dot/86885.
The Virginia Department of Transportation (VDOT) is interested in ways to improve asphalt mixture durability. These improvements can be accomplished through several approaches, including the use of performance-enhancing additives, such as fibers, and the incorporation of performance criteria in mixture design and acceptance. This project evaluated
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Diefenderfer, S. D., & Nair, H. (2025). Evaluation of Fiber-Modified Asphalt Mixtures Using BMD Tests (Report No. FHWA/VTRC 26-R05). Virginia Transportation Research Council (VTRC). https://rosap.ntl.bts.gov/view/dot/85820
Diefenderfer, Stacey D and Harikrishnan Nair. Evaluation of Fiber-Modified Asphalt Mixtures Using BMD Tests. Report no. FHWA/VTRC 26-R05. Virginia Transportation Research Council (VTRC), 2025. https://rosap.ntl.bts.gov/view/dot/85820.
Diefenderfer, Stacey D, and Harikrishnan Nair Evaluation of Fiber-Modified Asphalt Mixtures Using BMD Tests. Virginia Transportation Research Council (VTRC), 2025, Report no. FHWA/VTRC 26-R05, ROSA P. https://rosap.ntl.bts.gov/view/dot/85820.
The primary research objective of this project is to demonstrate the potential capability of emerging LiDAR sensing technologies in identifying and mitigating traffic conflicts (i.e., near-misses) at signalized intersections. The latest LiDAR sensing technologies allow for tracking vehicles and pedestrians (assigning each a unique temporary ID for
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Li, P. (., Yang, X. (., Zhu, P., Wang, P. (., & Sijan, S. (2025). Identifying Near-Misses (Including Red-Light Running) and Reducing Conflict Through D-FYA at Signalized Intersections Using LiDAR Sensors (Report No. UT-25.22). Utah. Dept. of Transportation. Division of Research. https://rosap.ntl.bts.gov/view/dot/88398
Li, Pengfei (Taylor), Xianfeng (Terry) Yang, Peter Zhu, Peirong (Slade) Wang, and Shrestha Sijan. Identifying Near-Misses (Including Red-Light Running) and Reducing Conflict Through D-FYA at Signalized Intersections Using LiDAR Sensors. Report no. UT-25.22. Utah. Dept. of Transportation. Division of Research, 2025. https://rosap.ntl.bts.gov/view/dot/88398.
Li, Pengfei (Taylor), et al. Identifying Near-Misses (Including Red-Light Running) and Reducing Conflict Through D-FYA at Signalized Intersections Using LiDAR Sensors. Utah. Dept. of Transportation. Division of Research, 2025, Report no. UT-25.22, ROSA P. https://rosap.ntl.bts.gov/view/dot/88398.
Micromobility has become increasingly popular in cities across Florida and the nation, offering a convenient, flexible, and accessible alternative for short-distance travel, particularly for first-and last-mile transportation. However, most areas of Florida and even the nation currently lack a framework and established practices for micromobility a
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Peng, Z. R. (2025). Micromobility Analytics in Florida: Usage Patterns, Public Transit Synergies, and Crash Insights [Summary]. Florida Department of Transportation. https://rosap.ntl.bts.gov/view/dot/86149
Peng, Zhong-Ren. Micromobility Analytics in Florida: Usage Patterns, Public Transit Synergies, and Crash Insights [Summary]. Florida Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/86149.
Peng, Zhong-Ren Micromobility Analytics in Florida: Usage Patterns, Public Transit Synergies, and Crash Insights [Summary]. Florida Department of Transportation, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/86149.
A recent study determined that the Virginia Department of Transportation (VDOT) can use up to 30% reclaimed asphalt pavement (RAP) in a pavement base aggregate layer without adverse effects on pavement performance. However, an effective quality-control protocol to monitor construction is needed to implement the use of RAP in the base course. The st
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Hossain, M. S., & Hoppe, E. J. (2025). Use of Nuclear Gauge for Construction Quality Control of Unbound Base Course Containing Reclaimed Asphalt Pavement (Report No. FHWA/VTRC 26-R06). Virginia Transportation Research Council (VTRC). https://rosap.ntl.bts.gov/view/dot/85677
Hossain, M. Shabbir and Edward J Hoppe. Use of Nuclear Gauge for Construction Quality Control of Unbound Base Course Containing Reclaimed Asphalt Pavement. Report no. FHWA/VTRC 26-R06. Virginia Transportation Research Council (VTRC), 2025. https://rosap.ntl.bts.gov/view/dot/85677.
Hossain, M. Shabbir, and Edward J Hoppe Use of Nuclear Gauge for Construction Quality Control of Unbound Base Course Containing Reclaimed Asphalt Pavement. Virginia Transportation Research Council (VTRC), 2025, Report no. FHWA/VTRC 26-R06, ROSA P. https://rosap.ntl.bts.gov/view/dot/85677.
This research investigated the use of lightweight fills as an alternative to conventional fills in transportation infrastructure, particularly for fill applications on soft, compressible soils. The study synthesized current practices through a literature review, survey of state DOTs, evaluation of case studies, and material costs. Through this rese
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Morsy, A. M., & Zornberg, J. G. (2025). Guidelines for Using Lightweight Fills in Transportation Infrastructure Applications (Report No. FHWA/TX-26/0-7237-1). University of Texas at Austin. Center for Transportation Research. https://rosap.ntl.bts.gov/view/dot/86889
Morsy, Amr M and Jorge G. Zornberg. Guidelines for Using Lightweight Fills in Transportation Infrastructure Applications. Report no. FHWA/TX-26/0-7237-1. University of Texas at Austin. Center for Transportation Research, 2025. https://rosap.ntl.bts.gov/view/dot/86889.
Morsy, Amr M, and Jorge G. Zornberg Guidelines for Using Lightweight Fills in Transportation Infrastructure Applications. University of Texas at Austin. Center for Transportation Research, 2025, Report no. FHWA/TX-26/0-7237-1, ROSA P. https://rosap.ntl.bts.gov/view/dot/86889.
This Research Summary is part of Report 2025-36, "Development of Biochar Specification Criteria as Soil Amendment for Slopes, Conveyances and Stormwater Treatment Systems (Phase 1)."
Barry, B., & Stenlund, D. (2025). Developing Biochar Specifications for Stormwater Management [Research Summary] (Report No. 2025-36RS). Minnesota. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/88367
Barry, Brian and Dwayne Stenlund. Developing Biochar Specifications for Stormwater Management [Research Summary]. Report no. 2025-36RS. Minnesota. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/88367.
Barry, Brian, and Dwayne Stenlund Developing Biochar Specifications for Stormwater Management [Research Summary]. Minnesota. Department of Transportation, 2025, Report no. 2025-36RS, ROSA P. https://rosap.ntl.bts.gov/view/dot/88367.
This study advances transportation access metrics that support public health planning across Massachusetts. Building on Phase I, which focused on food access, Phase II expands the scope to include healthcare, higher education, and parks. The research improves methods to account for walkability, bikeability, and the role of microtransit alongside fi
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Gonzales, E. J., Christofa, E., Luo, J., & Cardenas, C. (2025). Measuring Access to Improve Public Health – Phase II (Report No. 25-069). Massachusetts. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/86811
Gonzales, Eric J., Eleni Christofa, Jiewen Luo, and Christian Cardenas. Measuring Access to Improve Public Health – Phase II. Report no. 25-069. Massachusetts. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/86811.
Gonzales, Eric J., et al. Measuring Access to Improve Public Health – Phase II. Massachusetts. Department of Transportation, 2025, Report no. 25-069, ROSA P. https://rosap.ntl.bts.gov/view/dot/86811.
The objective of this project was to evaluate and compare different models used to predict the service life of concrete structures under the risk of chloride-induced corrosion and identify the most suitable model for FDOT. The project also sought to recommend appropriate input parameters for the selected model, considering Florida’s unique environm
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Antunes, R., & Alhasan, A. (2025). A Comparison of Service Life Models for Concrete Corrosion Durability [Summary] (Report No. 9-977-08). Florida. Department of Transportation. Research Center. https://rosap.ntl.bts.gov/view/dot/87985
Antunes, Rodrigo and Ahmad Alhasan. A Comparison of Service Life Models for Concrete Corrosion Durability [Summary]. Report no. 9-977-08. Florida. Department of Transportation. Research Center, 2025. https://rosap.ntl.bts.gov/view/dot/87985.
Antunes, Rodrigo, and Ahmad Alhasan A Comparison of Service Life Models for Concrete Corrosion Durability [Summary]. Florida. Department of Transportation. Research Center, 2025, Report no. 9-977-08, ROSA P. https://rosap.ntl.bts.gov/view/dot/87985.
Limited local availability often constrains the growing demand for high-quality aggregate materials in road construction. To address this challenge, recycled waste materials, including plastics, are being explored as sustainable alternatives. This study investigates the feasibility of incorporating recycled plastics into asphalt and concrete paveme
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Hasheminezhad, A., Rahman, M. L., Ceylan, H., Kim, S., Taylor, P. C., Mogawer, W. S., & Austerman, A. J. (2025). Use of Plastics in Road Materials (Paving) (Report No. MN 2025-28). Minnesota. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/88377
Hasheminezhad, Araz, Md Lutfor Rahman, Halil Ceylan, Sunghwan Kim, Peter C. Taylor, Walaa S. Mogawer, and Alexander J. Austerman. Use of Plastics in Road Materials (Paving). Report no. MN 2025-28. Minnesota. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/88377.
Hasheminezhad, Araz, et al. Use of Plastics in Road Materials (Paving). Minnesota. Department of Transportation, 2025, Report no. MN 2025-28, ROSA P. https://rosap.ntl.bts.gov/view/dot/88377.
This Research Summary is part of Report 2025-38, "Evaluating Strategies to Prevent Early-Age Bridge Deck Cracking."
Hedegaard, B. D., & Gronvall, B. (2025). Evaluating Strategies to Prevent Early-Age Bridge Deck Cracking [Research Summary] (Report No. 2025-38RS). Minnesota. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/88365
Hedegaard, Brock D. and Brock Gronvall. Evaluating Strategies to Prevent Early-Age Bridge Deck Cracking [Research Summary]. Report no. 2025-38RS. Minnesota. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/88365.
Hedegaard, Brock D., and Brock Gronvall Evaluating Strategies to Prevent Early-Age Bridge Deck Cracking [Research Summary]. Minnesota. Department of Transportation, 2025, Report no. 2025-38RS, ROSA P. https://rosap.ntl.bts.gov/view/dot/88365.
This study examines the potential of air-coupled Ground Penetrating Radar (AC-GPR) systems to overcome limitations in the Texas Department of Transportation’s (TxDOT) current pavement evaluation practices. The research integrates a comprehensive literature review, a statewide survey of TxDOT districts on GPR usage and barriers, and a technical asse
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Ham, S. P., Ryu, K. R., Lamsal, B., Lamsal, A., Maenza, A., Nikhilesh, A. S. R., Karthik, A., Jang, D., & Claudio-Loiz, E. X. (2025). Synthesis: Commercial Air-Coupled Ground Penetrating Radar Systems to Be Used for Pavement Evaluations in Texas (Report No. FHWA/TX-26/0-7217-R1). Texas Department of Transportation. Research and Technology Implementation Office. https://rosap.ntl.bts.gov/view/dot/88346
Ham, Suyun Paul, Kyeong Rok Ryu, Biggyan Lamsal, Avishkar Lamsal, Anthony Maenza, Aleti Sai Ram Nikhilesh, Arvind Karthik, Daeik Jang, and Emanuel Xavier Claudio-Loiz. Synthesis: Commercial Air-Coupled Ground Penetrating Radar Systems to Be Used for Pavement Evaluations in Texas. Report no. FHWA/TX-26/0-7217-R1. Texas Department of Transportation. Research and Technology Implementation Office, 2025. https://rosap.ntl.bts.gov/view/dot/88346.
Ham, Suyun Paul, et al. Synthesis: Commercial Air-Coupled Ground Penetrating Radar Systems to Be Used for Pavement Evaluations in Texas. Texas Department of Transportation. Research and Technology Implementation Office, 2025, Report no. FHWA/TX-26/0-7217-R1, ROSA P. https://rosap.ntl.bts.gov/view/dot/88346.
Project 0-7231 evaluated the feasibility and readiness of Carbon Capture, Utilization, and Storage (CCUS) technologies for integration into Texas transportation infrastructure. The study provided a comprehensive review of CCUS methods, assessed material-based applications such as CO₂-injected concrete and bio-based alternatives, and developed a lif
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Rausch, C., Ferron, R., Dubay, C., Baral, A., Rogers, L., & Loftus-Otway, L. (2025). Synthesis of Carbon Capture and Repurposing By-Products (Report No. FHWA/TX-26/0-7231-1). University of Texas at Austin. Center for Transportation Research. https://rosap.ntl.bts.gov/view/dot/86840
Rausch, Christopher, Raissa Ferron, Caitlin Dubay, Aniruddha Baral, Laura Rogers, and Lisa Loftus-Otway. Synthesis of Carbon Capture and Repurposing By-Products. Report no. FHWA/TX-26/0-7231-1. University of Texas at Austin. Center for Transportation Research, 2025. https://rosap.ntl.bts.gov/view/dot/86840.
Rausch, Christopher, et al. Synthesis of Carbon Capture and Repurposing By-Products. University of Texas at Austin. Center for Transportation Research, 2025, Report no. FHWA/TX-26/0-7231-1, ROSA P. https://rosap.ntl.bts.gov/view/dot/86840.
Centerline rumble strips (CLRS) significantly reduce severe head-on crashes on two lane roads, although installing CLRS in asphalt pavements may accelerate deterioration of the pavement at the longitudinal construction joint. Recent research has suggested chip sealing new rumble strips as a preventive measure; however, chip sealing immediately foll
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Swiertz, D., DeCarlo, K., Rodriquez, F. K., & Reichelt, S. (2025). Materials-Based Methods to Improve Rumble Strip Durability (Report No. NRRA202503). Minnesota. Department of Transportation. https://hdl.handle.net/20.500.14153/mndot.17871
Swiertz, Dan, Katie DeCarlo, Faustina Keuliyan Rodriquez, and Signe Reichelt. Materials-Based Methods to Improve Rumble Strip Durability. Report no. NRRA202503. Minnesota. Department of Transportation, 2025. https://hdl.handle.net/20.500.14153/mndot.17871.
Swiertz, Dan, et al. Materials-Based Methods to Improve Rumble Strip Durability. Minnesota. Department of Transportation, 2025, Report no. NRRA202503, ROSA P. https://hdl.handle.net/20.500.14153/mndot.17871.
Online shopping has a large impact on Florida’s economy. It also has a significant effect on Florida’s freight systems.
Watts, B., Jin, X., & Titiloye, I. (2025). Investigation of E-Commerce Enabled Freight Demand and Activities in Residential Areas. Florida Department of Transportation. https://rosap.ntl.bts.gov/view/dot/86008
Watts, Brian, Xia Jin, and Ibukun Titiloye. Investigation of E-Commerce Enabled Freight Demand and Activities in Residential Areas. Florida Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/86008.
Watts, Brian, et al. Investigation of E-Commerce Enabled Freight Demand and Activities in Residential Areas. Florida Department of Transportation, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/86008.
This Research Summary is part of Report 2025-37, "Analysis of School Bus Stop-Arm Violation Reporting and Enforcement in Minnesota: Lessons Learned and Opportunities for Process Improvements."
Davis, B., Morris, N. L., Edgeworth, S., & Krukowski, M. (2025). Increasing School Bus Stop-Arm Compliance [Research Summary] (Report No. 2025-37RS). Minnesota. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/88366
Davis, Brian, Nichole L. Morris, Scot Edgeworth, and Michael Krukowski. Increasing School Bus Stop-Arm Compliance [Research Summary]. Report no. 2025-37RS. Minnesota. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/88366.
Davis, Brian, et al. Increasing School Bus Stop-Arm Compliance [Research Summary]. Minnesota. Department of Transportation, 2025, Report no. 2025-37RS, ROSA P. https://rosap.ntl.bts.gov/view/dot/88366.
Built on three pillars of economic development, innovation, and partnerships, I-STREET™ is a real-world transportation testbed developed to enhance transportation safety and mobility. The testbed allows researchers to develop, test, and evaluate emerging technologies in a live environment with real traffic, covering a variety of transportation mode
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Elefteriadou, L. (2025). Support for the I-STREET™ (Implementing Solutions from Transportation Research and Evaluation of Emerging Technologies) Testbed [Summary]. Florida. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/86097
Elefteriadou, Lily. Support for the I-STREET™ (Implementing Solutions from Transportation Research and Evaluation of Emerging Technologies) Testbed [Summary]. Florida. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/86097.
Elefteriadou, Lily Support for the I-STREET™ (Implementing Solutions from Transportation Research and Evaluation of Emerging Technologies) Testbed [Summary]. Florida. Department of Transportation, 2025, ROSA P. https://rosap.ntl.bts.gov/view/dot/86097.
This report provides a summary of the framework and methodology underlying the second-generation seismic fragility work (g2F) using selected concrete box-girder bridges in California. It outlines the key components and processes involved in the g2F project designed to improve earthquake risk assessment and mitigation strategies. The report first in
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Zheng, Q., Yang, W. C., Roblee, C. J., & DesRoches, R. (2025). Generation-2 Fragility Models for California Highway Bridges (Report No. CA25-1780). California. Department of Transportation. Department of Research, Innovation and System Information. https://rosap.ntl.bts.gov/view/dot/87014
Zheng, Qiu, Walter C.S. Yang, Cliff J. Roblee, and Reginald DesRoches. Generation-2 Fragility Models for California Highway Bridges. Report no. CA25-1780. California. Department of Transportation. Department of Research, Innovation and System Information, 2025. https://rosap.ntl.bts.gov/view/dot/87014.
Zheng, Qiu, et al. Generation-2 Fragility Models for California Highway Bridges. California. Department of Transportation. Department of Research, Innovation and System Information, 2025, Report no. CA25-1780, ROSA P. https://rosap.ntl.bts.gov/view/dot/87014.
The objective of the research project was to compare the performance of corrugated high-density polyethylene (HDPE) pipes manufactured with recycled content to those manufactured with only virgin materials. MnDOT currently requires HDPE pipes to be made with 100% virgin materials. However, recent changes to American Association State Highway and Tr
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Pluimer, M., & Padden, K. (2025). Evaluation of Corrugated HDPE Pipes Manufactured with Recycled Content (Report No. MN 2025-32). Minnesota. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/88371
Pluimer, Michael and K Padden. Evaluation of Corrugated HDPE Pipes Manufactured with Recycled Content. Report no. MN 2025-32. Minnesota. Department of Transportation, 2025. https://rosap.ntl.bts.gov/view/dot/88371.
Pluimer, Michael, and K Padden Evaluation of Corrugated HDPE Pipes Manufactured with Recycled Content. Minnesota. Department of Transportation, 2025, Report no. MN 2025-32, ROSA P. https://rosap.ntl.bts.gov/view/dot/88371.
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