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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.

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Showing 1 - 20 of 36104 results
  • Surface Mixtures Incorporating Recycled Plastic and High Reclaimed Asphalt Pavement Contents 2022 and 2023 Field Trials
    Surface Mixtures Incorporating Recycled Plastic and High Reclaimed Asphalt Pavement Contents: 2022 and 2023 Field Trials
    Habbouche, Jhony ;
    Diefenderfer, Stacey D.
    2026-04-01 | PDF
    Like many other state highway agencies, the Virginia Department of Transportation is extensively working to consider how to best incorporate recycled materials—such as recycled plastic, reclaimed asphalt pavement (RAP) at higher contents with and without the use of recycling agents (RAs), and other materials—into their roads while maintaining or im ...
  • 2024 FARSCRSS Coding and Validation Manual
    2024 FARS/CRSS Coding and Validation Manual
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2026-04-01 | PDF
    NHTSA has collected motor vehicle traffic crash data since the early 1970s to support its mission to reduce motor vehicle traffic crashes, injuries, and deaths on our Nation’s trafficways. The two data systems included in this Coding and Validation Manual are the Fatality Analysis Reporting System (FARS) and the Crash Report Sampling System (CRSS). ...
  • Product Information Catalog and Vehicle Listing vPIC Analytical Users Manual 2024
    Product Information Catalog and Vehicle Listing (vPIC) Analytical User's Manual, 2024
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2026-04-01 | PDF
    This manual updates guidance to users of VIN decoding in NHTSA’s crash studies using NHTSA’s Product Information Catalog and Vehicle Listing (vPIC) based on vehicle manufacturer submissions to NHTSA as mandated by 49 CFR Part 565.
  • Teens and Distracted Driving in 2024 Teen Distracted Driver Data
    Teens and Distracted Driving in 2024 [Teen Distracted Driver Data]
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2026-04-01 | PDF
    The National Highway Traffic Safety Administration works to reduce the occurrence of distracted driving and raise awareness of its dangers. This risky driving behavior poses a danger not only to vehicle occupants but pedestrians and pedalcyclists as well. Driver distraction is a specific type of driver inattention that occurs when drivers divert at ...
  • The Costs of Traveling With Children Transportation Challenges for LowIncome Families Policy Brief
    The Costs of Traveling With Children: Transportation Challenges for Low-Income Families [Policy Brief]
    Butler, Tamika L. ;
    Wander, Madeline
    2026-04-01 | PDF
    This policy brief is drawn from “Transportation Challenges of Low-Income Households with Children: A Case Study in South Los Angeles,” published in the Journal of Planning Education and Research, with funding received by the University of California Institute of Transportation Studies through the Road Repair and Accountability Act of 2017(Senate Bi ...
  • Fatality Analysis Reporting System Analytical Users Manual 19752024
    Fatality Analysis Reporting System Analytical User’s Manual, 1975-2024
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2026-04-01 | PDF
    This is the updated and revised Fatality Analysis Reporting System Analytical User’s Manual for the period 1975 to 2024.
  • Crash Report Sampling System Analytical Users Manual 20162024
    Crash Report Sampling System Analytical User’s Manual, 2016-2024
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2026-04-01 | PDF
    This is the updated and revised Crash Report Sampling System Analytical User’s Manual for the period 2016 to 2024.
  • 2024 FARSCRSS Coding Manual for Pedestrian Bicyclist Crash Typing
    2024 FARS/CRSS Coding Manual for Pedestrian Bicyclist Crash Typing
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2026-04-01 | PDF
    NHTSA has collected motor vehicle traffic crash data since the early 1970s to support its mission to reduce motor vehicle traffic crashes, injuries, and deaths on our Nation’s trafficways. The two data systems included in this Coding and Validation Manual are the Fatality Analysis Reporting System (FARS) and the Crash Report Sampling System (CRSS). ...
  • Hydrologic Approaches to Playa Lakes Areas of Significant Karst Geology and Arid Regions Appendix B
    Hydrologic Approaches to Playa Lakes, Areas of Significant Karst Geology, and Arid Regions: Appendix B
    Ahmari, Habib ;
    Baharvand, Saman
    2026-04-01 | PDF
    The methodology employed to achieve the project’s objective involves a systematic review of design guidance, standards, and recommendations relevant to hydrology and hydraulic design of transportation infrastructure such as drainage and stormwater systems. This involved reviewing various sources, including state departments of transportation draina ...
  • Hydrologic Approaches to Playa Lakes Areas of Significant Karst Geology and Arid Regions Appendix A
    Hydrologic Approaches to Playa Lakes, Areas of Significant Karst Geology, and Arid Regions: Appendix A
    Ahmari, Habib ;
    Baharvand, Saman
    2026-04-01 | PDF
    The primary objective of this project was to compile and synthesize current knowledge and practices related to hydrological approaches for playa lakes, karst terrains, and arid regions. To achieve this, the project began with a comprehensive evaluation of existing research, design guidance, standards, and practices for hydrological studies in these ...
  • Hydrologic Approaches to Playa Lakes Areas of Significant Karst Geology and Arid Regions Appendix C
    Hydrologic Approaches to Playa Lakes, Areas of Significant Karst Geology, and Arid Regions: Appendix C
    Ahmari, Habib ;
    Baharvand, Saman
    2026-04-01 | PDF
    Playa lakes, arid regions, and karst terrains are significant geographic and hydrological features throughout Texas, each posing unique challenges due to their complex and varied hydrology. Currently, there are no standardized guidelines or criteria for the hydrological and hydraulic design of transportation infrastructure in these landscapes, whic ...
  • BED329771 NEXTGEN Concrete Tests of the Future Chloride Diffusion
    BED32-977-1 NEXTGEN Concrete – Tests of the Future: Chloride Diffusion
    Su, Dan ;
    Ismail, Mohamed
    2026-03-24 | PDF
    FDOT is seeking to maximize the durability of newly constructed structural elements. As part of this goal, FDOT needs to do a better job assessing concrete mixes for specific structural applications. This assessment needs to adapt to the ever-changing physical, chemical, and market issues associated with concrete’s constituent ingredients. FDOT nee ...
  • How Does Transportation Insecurity Compare and Relate to Other Indicators of Material Hardship in the US
    How Does Transportation Insecurity Compare and Relate to Other Indicators of Material Hardship in the U.S.?
    Murphy, Alexandra K. ;
    Pilkauskas, Natasha V.
    2026-03-01 | PDF
    Increasingly, researchers have used measures of material hardship (food, housing, utility, bills, medical) to better understand economic distress. Missing from this literature are hardships related to transportation. This descriptive paper uses recent nationally representative data and a newly validated measure of transportation insecurity to addre ...
  • Halifax County Road Orders 17521767
    Halifax County Road Orders 1752–1767
    Miller, Ann Brush
    2026-03-01 | PDF
    The road history projects undertaken by the Virginia Transportation Research Council establish the feasibility of studies of early road networks and their use in the environmental review process. These projects, by gathering and publishing the early road orders of the vast parent counties and other significant areas, also lay the foundation for add ...
  • Intersection Safety Performance Function Calibration for Project Planning and Design
    Intersection Safety Performance Function Calibration for Project Planning and Design
    Appiah, Justice
    2026-03-01 | PDF
    This study calibrated the predictive models for conventional intersections in the Highway Safety Manual (HSM) second edition draft to account for local conditions in Virginia. The calibration ensures that predictions made with the HSM safety performance functions accurately reflect the crash experience, driver population, and environmental characte ...
  • Technical Appendix Mapping HighQuality Transit
    Technical Appendix: Mapping High-Quality Transit
    Wasserman, Jacob L. ;
    Barrall, Aaron
    2026-03-01 | PDF
    “Major transit stop”: how these three words are defined determines what can be built where, throughout much of California. In order to address housing supply constraints, the state legislature has enacted a number of laws that streamline approval and remove zoning constraints in areas close to high-quality transit. But what, exactly, is a “major tr ...
  • Signal Controller in the Loop Simulation
    Signal Controller in the Loop Simulation
    Hurwitz, David ;
    Jashami, Hisham
    2026-03-01 | PDF
    A novel Hardware-in-the-loop Simulation tool was constructed to show how modifications to signal timings would improve coordinated corridor performance. A total of 15 unique microsimulation models were developed and run three times each to test three case studies of bi-direction bandwidth optimization, cycle length sensitivity, and leading pedestri ...
  • Analysis of the Potential Revenue and Equity Impacts of an ECommerce Household Delivery Fee in Oregon
    Analysis of the Potential Revenue and Equity Impacts of an E-Commerce Household Delivery Fee in Oregon
    Figliozzi, Miguel
    ORCID ICON IMG
    2026-03-01 | PDF
    The research goal of this project is to better understand the potential implications of a household e-commerce delivery fee. A survey was developed to study the factors that impact potential revenue and its equity implications.
  • Use of FiberReinforced Polymer Composites for Bridge Repairs in Montana
    Use of Fiber-Reinforced Polymer Composites for Bridge Repairs in Montana
    Ahmed, Emtiaz ;
    Matteson, Kirsten
    2026-03-01 | PDF
    Montana’s timber bridge inventory includes over 600 state and county owned bridges, many more than 80 years old and showing visible deterioration. Traditional girder repair methods, such as steel hangers and timber or steel sister girders, are heavy, labor-intensive, and often lack well-documented performance verification. Fiber-reinforced polymer ...
  • Optimizing Missouris Statewide Transportation Improvement Program Letting and Construction Schedule
    Optimizing Missouri's Statewide Transportation Improvement Program Letting and Construction Schedule
    Loos, Ryan ;
    Adams, Bill
    2026-03-01 | PDF
    This study evaluated how Missouri’s annual letting calendar could be structured to improve competition and lower award costs while remaining feasible under existing policies and delivery practices. Historical bid outcomes were used to estimate monthly “performance curves” that related workload share to observed price behavior. A genetic algorithm t ...
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