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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 36049 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 ...
  • 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). ...
  • 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 ...
  • Developing Data Sources and Standards for Supporting Arterial TSMO Implementation of the Statewide Arterial Management Program STAMP Summary
    Developing Data Sources and Standards for Supporting Arterial TSM&O Implementation of the Statewide Arterial Management Program (STAMP) [Summary]
    Heery, Fred ;
    Abdel-Aty, Mohamed
    2026-03-01 | PDF
    The project aimed to develop data sources, standards, and actionable guidance that FDOT can use to strengthen arterial TSM&O implementation statewide. This included reviewing the literature, evaluating existing software tools, identifying best practices from other departments of transportation, and creating recommendations tailored to Florida’s dis ...
  • 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 ...
  • 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 ...
  • OpenGraded Friction Courses Suitable for Suburban Environments Summary
    Open-Graded Friction Courses Suitable for Suburban Environments [Summary]
    Tran, Nam ;
    Moseley, Howie
    2026-03-01 | PDF
    The project aimed to evaluate the impact of four strategies designed to improve the durability of FC-5 mixtures: employing a 9.5-mm nominal maximum aggregate size (NMAS) gradation; using a high polymer (HP) modified binder in the mixture; assessing the effectiveness of a 12.5-mm stone matrix asphalt (SMA); and exploring an alternative friction cour ...
  • Factors That Influence the Variability of Concrete Surface Resistivity of Field Cast Samples Summary
    Factors That Influence the Variability of Concrete Surface Resistivity of Field Cast Samples [Summary]
    DeLorenzo, Richard ;
    Riding, Kyle A.
    2026-03-01 | PDF
    The main objective of this research was to identify and quantify the factors that influence resistivity measurements in concrete samples, comparing field- and laboratory-fabricated specimens (per AASHTO T 358 and AASHTO TP 119).
  • Waterline Pile Cap Footings for Bridges Using Large Diameter FRP Reinforcing Material Characterization and Design Summary
    Waterline Pile Cap Footings for Bridges Using Large Diameter FRP Reinforcing – Material Characterization and Design [Summary]
    Nanni, Antonio ;
    Nolan, Steven
    2026-03-01 | PDF
    The objective of the research was to identify what further research is needed to use larger FRP bars in waterline pile cap footings, develop material acceptance criteria and design specifications for No. 11 glass FRP bars, and create design examples to help implement these bars in practice. Additionally, the study provided recommendations for futur ...
  • 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 ...
  • Accurate Collection and Reporting of Worker Presence in Work Zones
    Accurate Collection and Reporting of Worker Presence in Work Zones
    Qing, Zhu ;
    Adu-Gyamfi, Yaw
    2026-03-01 | PDF
    Highway work zones remain high-risk environments due to the close interaction between workers, live traffic, and heavy equipment. While platforms like the Work Zone Data Exchange (WZDx) and DOT traveler information maps provide location and traffic impact data, real-time, verified information regarding actual worker presence is often unavailable. T ...
  • Accurate Collection and Reporting of Worker Presence in Work Zones Summary
    Accurate Collection and Reporting of Worker Presence in Work Zones [Summary]
    Qing, Zhu ;
    Adu-Gyamfi, Yaw
    2026-03-01 | PDF
    Highway work zones remain high-risk environments due to the close interaction between workers, live traffic, and heavy equipment. While platforms like the Work Zone Data Exchange (WZDx) and DOT traveler information maps provide location and traffic impact data, real-time, verified information regarding actual worker presence is often unavailable. T ...
  • Optimizing Missouris Statewide Transportation Improvement Program Letting and Construction Schedule Summary
    Optimizing Missouri's Statewide Transportation Improvement Program Letting and Construction Schedule [Summary]
    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 ...
  • Confinement Effect of Narrow Baseplates or Reaction Area on Anchor Breakout Part 3 Summary
    Confinement Effect of Narrow Baseplates or Reaction Area on Anchor Breakout, Part 3 [Summary]
    Suksawang, Nakin ;
    Nolan, Steven
    2026-03-01 | PDF
    The research aimed to evaluate how screw anchors actually perform in real FDOT conditions, understand why the current ACI design approach is conservative, and develop improved FDOT design guidelines that safely allow screw anchors to be used more widely, without unnecessary restrictions.
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