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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 36020 results
  • 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 ...
  • 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 ...
  • 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.
  • 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 ...
  • 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).
  • Special Crash Investigations OnSite Ambulance Crash Investigation Vehicle 2018 Chevrolet Silverado 3500 Type I Ambulance Location Kentucky Crash Date April 2024
    Special Crash Investigations: On-Site Ambulance Crash Investigation; Vehicle: 2018 Chevrolet Silverado 3500 Type I Ambulance; Location: Kentucky; Crash Date: April 2024
    Crash Research & Analysis, Inc
    2026-03-01 | PDF
    This on-site investigation documents the front plane underride crash of a 2018 Chevrolet Silverado 3500 Type I ambulance and a 2021 Kenworth T3 series refrigerated box truck. The front of the ambulance struck and underrode the left side of the Kenworth. The crash resulted in fatal injuries to the ambulance’s belted 26-yearold male EMT driver and 75 ...
  • 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.
  • Enhancement of AASHTOWare Bridge Management for Floridas Bridge Inspection and Asset Management Summary
    Enhancement of AASHTOWare Bridge Management for Florida’s Bridge Inspection and Asset Management [Summary]
    Padilla, Felix ;
    Sobanjo, John O.
    2026-03-01 | PDF
    The primary objective of the research was to help FDOT successfully implement and optimize the AASHTOWare BrM software by recalibrating its essential analytical models—such as deterioration, risk, cost, and data translation tools—so the software can more accurately forecast bridge performance, support decision-making, and satisfy federal requiremen ...
  • NEXTGEN Concrete Tests of the Future Chloride and Sulfate Durability Summary
    NEXTGEN Concrete – Tests of the Future: Chloride and Sulfate Durability [Summary]
    Su, Dan ;
    Simmons, Ronald
    2026-03-01 | PDF
    The objective of this project was to determine appropriate screening thresholds for tests that assess concrete durability in extremely aggressive chloride and sulfate environments. Specifically, the research aimed to recommend threshold values for bulk and surface resistivity tests (based on AASHTO TP 119 and T 358) for chloride durability, and for ...
  • Barrier Striping for the Reduction of Accidents
    Barrier Striping for the Reduction of Accidents
    Kutela, Boniphace ;
    Geedipally, Srinivas
    2026-02-01 | PDF
    Barrier striping is a roadway safety countermeasure designed to enhance driver awareness of concrete barriers, particularly under adverse weather and low-visibility conditions. This study evaluated the short- and long-term safety effectiveness of retroreflective barrier striping across multiple sites in Texas. The research involved a comprehensive ...
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