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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 36179 results
  • Improving Traffic Signal System Planning Design and Management with BigDataEnhanced ATSPM System
    Improving Traffic Signal System Planning, Design, and Management with Big-Data-Enhanced ATSPM System
    Li, Pengfei (Taylor) ;
    Mattingly, Stephen P.
    2026-04-01 | PDF
    In this project, an ATSPM-in-the-loop simulation framework is developed to introduce the data-driven ATSPM framework into traffic signal planning and design. Literature review on ATSPM and Best practice survey are conducted first. Then the research team explores and documents how to set up two real-world open-source ATSPM systems: Utah-DOT ATSPM sy ...
    Supporting Files
  • 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 ...
  • 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 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 ...
  • US Department of Transportation Strategic Plan FY 20262030
    U.S. Department of Transportation Strategic Plan: FY 2026-2030
    United States. Department of Transportation
    2026-04-01 | PDF
    This Strategic Plan (or Plan) establishes the U.S. Department of Transportation (Department or DOT) strategic goals and objectives for Fiscal Years (FY) 2026 through 2030. In accordance with the Government Performance and Results Act (GPRA) Modernization Act of 2010, Cabinet-level departments must develop a new Strategic Plan at the beginning of ea ...
  • 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 ...
  • 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 ...
  • Optimizing the Use of Local Aggregate in StoneMastic Asphalt
    Optimizing the Use of Local Aggregate in Stone-Mastic Asphalt
    Al-Qadi, Imad L. ;
    Mainieri, Javier J. García
    2026-04-01 | PDF
    This study investigated the potential pavement performance, resiliency, cost-effectiveness, and environmental efficiency of incorporating locally sourced Illinois aggregates into stone-mastic asphalt (SMA) through an integrated laboratory and full-scale assessment. SMAs were designed using local aggregates with different lithology and durability le ...
  • Implementation of Balanced Mix Design Methods in Oregon to Meet LongTerm Performance Goals
    Implementation of Balanced Mix Design Methods in Oregon to Meet Long-Term Performance Goals
    Coleri, Erdem ;
    Sukhija, Mayank
    2026-04-01 | PDF
    This study presents the development and implementation of a Balanced Mix Design (BMD) framework customized for Oregon’s materials, traffic, and climate conditions, aiming to improve asphalt pavement durability, environmental performance, and cost-effectiveness. While traditional volumetric mix designs have been widely adopted, they may sometimes le ...
  • Identifying Road Segments That Bisect Predicted Movement Corridors for Small Priority Species in Virginia
    Identifying Road Segments That Bisect Predicted Movement Corridors for Small Priority Species in Virginia
    Akre, Thomas ;
    Connette, Grant
    2026-04-01 | PDF
    The Virginia General Assembly passed legislation in 2020 requiring the preparation of the Virginia Wildlife Corridor Action Plan. It directed the Virginia Department of Wildlife Resources in collaboration with the Virginia Department of Transportation, the Virginia Department of Conservation and Recreation, and the Virginia Department of Forestry t ...
  • Report R26R37 Identifying Road Segments That Bisect Predicted Movement Corridors for Small Priority Species in Virginia Research Project Brief
    Report R26-R37: Identifying Road Segments That Bisect Predicted Movement Corridors for Small Priority Species in Virginia: Research Project Brief
    Akre, Thomas ;
    Connette, Grant
    2026-04-01 | PDF
    The purpose of this study was to advance the objectives of the legislated WCAP by developing species-specific road risk models and identifying road segments that pose a high risk to small priority species. The study also highlighted potential approaches to improving road-crossing connectivity based on species-specific movement corridors and road ri ...
  • Evaluation of Impacts Due to a Bridge Closure A Case Study of the Mississippi River Bridges in Arkansas
    Evaluation of Impacts Due to a Bridge Closure: A Case Study of the Mississippi River Bridges in Arkansas
    Hernandez, Sarah ;
    Mitra, Suman
    2026-04-01 | PDF
    The TRC 2303 report presents a comprehensive analysis of the impacts of bridge closures across the Mississippi River in Arkansas, focusing on four key crossings: I-40, I-55, HWY 49, and HWY 82. Prompted by the emergency closure of the I-40 Hernando de Soto Bridge in 2021, the study evaluates both full and partial closures to quantify economic, safe ...
  • Artificial Intelligence for Pavement Condition Assessment From 2D3D Surface Images Technical Summary Report
    Artificial Intelligence for Pavement Condition Assessment From 2D/3D Surface Images [Technical Summary Report]
    Wang, Feng ;
    Gong, Haitao
    2026-03-31 | PDF
    The project started with reviewing the literature of available datasets, established AI models and practices in the U.S. and other countries. The research team investigated the acquisition of high-resolution images with American Association of Highway and Transportation Officials (AASHTO) standard MP47 and created a tool for viewing the vendor’s da ...
  • 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 ...
  • 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 ...
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