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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 41 - 60 of 36336 results
  • PerformanceBased StructuralFire Engineering Analysis Approaches for Highway Bridges
    Performance-Based Structural-Fire Engineering Analysis Approaches for Highway Bridges
    Quiel, Spencer ;
    Ma, Saidong
    2026-03-27 | PDF
    This report is the second part of a two-phase study to assemble performance-based design guidance for the evaluation and mitigation of severe fire hazards for highway bridges. The following are addressed: (1) summarize design-basis tools that can be used for “engineering analysis” per NFPA 502 Chapter 6 to calculate the thermo-mechanical impact of ...
  • 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 ...
  • Integrated Optimization of Routing Scheduling Charging and Platooning for a Mixed Fleet of Electric and Conventional Trucks
    Integrated Optimization of Routing, Scheduling, Charging, and Platooning for a Mixed Fleet of Electric and Conventional Trucks
    Hosseinpanahi, Danesh ;
    Yang, Jialu
    2026-03-20 | PDF
    The integration of truck platooning and electrification presents a promising avenue for improving operational efficiency and environmental sustainability in freight transportation. Realizing the energy and cost saving as well as emission reduction benefits requires a holistic design of truck routing, scheduling, and platooning strategies that accou ...
  • 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 ...
  • Use of Vegetation Enhanced by Green Soil Stabilization To Protect Kansas Roadsides From Erosion
    Use of Vegetation Enhanced by Green Soil Stabilization To Protect Kansas Roadsides From Erosion
    Perić, Dunja ;
    Olia, Arash Saeidi Rashk
    2026-03-01 | PDF
    The primary objective of this study was to investigate the feasibility of using lignin, an environmentally friendly biopolymer, for sustainable protection of Kansas roadsides against wind and rainfall erosion during the critical stage of construction that occurs prior to the emergence of a vegetative cover. Results from laboratory-scale experiments ...
  • Creating Effective Graphic Changeable Dynamic Message Sign DMS Messaging Technical Summary
    Creating Effective Graphic Changeable Dynamic Message Sign (DMS) Messaging [Technical Summary]
    Kondyli, Alexandra ;
    Schrock, Steven D.
    2026-03-01 | PDF
    Successful transportation messages are only effective if travelers can read and comprehend the message. However, text-based messages can be challenging for non-native English speakers or slow-reading populations, such as the elderly. The addition of graphics messages as a potential aid to improve message comprehension is uncertain, as is their effe ...
  • 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 ...
  • 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 ...
  • 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).
  • 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.
  • 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 ...
  • 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 ...
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