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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 36569 results
  • Emergency Routing Signs Pilot on the I81 Corridor in the Staunton Area
    Emergency Routing Signs Pilot on the I-81 Corridor in the Staunton Area
    Zhao, Mo ;
    Lan, Chien-Lun
    2026-06-01 | PDF
    Traffic incidents on the Interstate 81 corridor account for approximately 77% of all delays, significantly affecting regional mobility and roadway capacity. To enhance incident management and reduce the logistical burdens associated with manual detour deployment, the Virginia Department of Transportation's (VDOT) Staunton District initiated a pilot ...
  • What to Expect When Youre Expecting Passenger Rail How Central Valley Communities Are Preparing for HighSpeed Rail
    What to Expect When You're Expecting Passenger Rail: How Central Valley Communities Are Preparing for High-Speed Rail
    Hazelton-Boyle, Josephine K. ;
    Bick, Naomi
    2026-06-01 | PDF
    Approved by California voters in 2008, the California High-Speed Rail (CAHSR) project is a planned 800-mile rail corridor across California aimed at delivering intercity passenger rail service to the state's largest metropolitan areas. This was the first voter-approved high-speed rail project in the United States and remains one of its most content ...
  • What to Expect When Youre Expecting Passenger Rail How Central Valley Communities Are Preparing for HighSpeed Rail Research Brief
    What to Expect When You're Expecting Passenger Rail: How Central Valley Communities Are Preparing for High-Speed Rail [Research Brief]
    Hazelton-Boyle, Josephine K. ;
    Bick, Naomi
    2026-06-01 | PDF
    Imagine a brand-new transportation system connecting places in ways they have never connected before. Now imagine you have to gain political approval from diverse and polarized groups and local governments to build this system. This is exactly the task the state of California set for itself in constructing the High-Speed Rail (HSR). The current pro ...
  • Evaluation of Existing Transportation Demand Management Calculators
    Evaluation of Existing Transportation Demand Management Calculators
    Scheib, Walter ;
    Kilpatrick, Ian
    2026-06-01 | PDF
    The Colorado Department of Transportation (CDOT) supports the use of Transportation Demand Management (TDM) strategies to reduce greenhouse gas emissions (GHG) and maximize transportation investments implemented at the state and local levels. This report represents initial research that will inform potential development of a CDOT TDM Calculator. Sp ...
  • Developing a Standardized Acceptance Framework for Traffic Count Devices Traffic Count and Classification Verification
    Developing a Standardized Acceptance Framework for Traffic Count Devices: Traffic Count and Classification Verification
    Lan, Chien-Lun ;
    Zhao, Mo
    2026-06-01 | PDF
    As the Virginia Department of Transportation (VDOT) transitions from traditional in-pavement sensors to non-intrusive traffic monitoring technologies, a standardized and mathematically defensible verification process is required to ensure data integrity. This research establishes a comprehensive Device Acceptance Framework designed to evaluate the ...
  • Routes to Sustainable Goods Movement How Local and Regional Governmental Agencies Can Plan for the Sustainable Freight System of the Future
    Routes to Sustainable Goods Movement: How Local and Regional Governmental Agencies Can Plan for the Sustainable Freight System of the Future
    Alexander, Serena ;
    Grady, Avante
    2026-06-01 | PDF
    Freight transportation plays a critical role in supporting economic activity and everyday consumption across metropolitan regions, but growing freight demand continues to increase congestion, infrastructure strain, greenhouse gas emissions, air pollution, and safety risks. These impacts often disproportionately affect low-income and environmentally ...
  • Routes to Sustainable Goods Movement How Local and Regional Governmental Agencies Can Plan for the Sustainable Freight System of the Future Research Brief
    Routes to Sustainable Goods Movement: How Local and Regional Governmental Agencies Can Plan for the Sustainable Freight System of the Future [Research Brief]
    Alexander, Serena ;
    Grady, Avante
    2026-06-01 | PDF
    This research examines how metropolitan regions across the U.S. are planning for sustainable freight transportation. The study analyzes freight plans from eight major metropolitan regions and interviews freight professionals to identify common strategies, implementation approaches, emerging trends, and persistent barriers. The goal is to provide lo ...
  • Report 26R52 Addressing Fly Ash Shortage With Limestone Calcined Clay Cement Research Project Brief
    Report 26-R52: Addressing Fly Ash Shortage With Limestone Calcined Clay Cement [Research Project Brief]
    Arce, Gabriel A. ;
    Behravan, Amir
    2026-06-01 | PDF
    The objective of this study was to evaluate limestone calcined clay cement (LC3)-a ternary blended cement (Type IT) typically containing 30% calcined clay and 15% limestone-and LC2, a similar cementitious system produced by replacing 30% of Portland limestone cement (Type IL) with calcined clay, as viable alternatives to conventional cementitious s ...
  • Report 26R53 Developing a Standardized Acceptance Framework for Traffic Count Devices Research Project Brief
    Report 26-R53: Developing a Standardized Acceptance Framework for Traffic Count Devices [Research Project Brief]
    Lan, Chien-Lun ;
    Zhao, Mo
    2026-06-01 | PDF
    Accurate traffic volume and vehicle classification data are essential for VDOT's planning, design, operations, and federal reporting activities. To ensure consistent evaluation of emerging traffic count devices, VDOT requires a standardized and statistically defensible acceptance procedure. This procedure provides a uniform method for assessing pro ...
  • Report 26R47 Field Evaluation and Asset Management Planning for Noise Barriers Research Project Brief
    Report 26-R47: Field Evaluation and Asset Management Planning for Noise Barriers [Research Project Brief]
    Provines, Jason T.
    2026-06-01 | PDF
    The purpose of this research was to improve the life-cycle management of VDOT's noise barrier inventory. This project was conducted through (1) field evaluations of the condition and durability of VDOT's noise barriers, (2) developing a framework for VDOT noise barrier inspection and asset management programs, and (3) conducting trial inspections u ...
  • Report 26R51 Analyzing and Predicting Truck Travel Time Reliability Research Project Brief
    Report 26-R51: Analyzing and Predicting Truck Travel Time Reliability [Research Project Brief]
    Zhao, Mo ;
    Appiah, Justice
    2026-06-01 | PDF
    The study analyzed 2019-2025 National Performance Management Research Data Set truck travel time data for 1,743 interstate segments alongside traffic, roadway, crash, incident, and weather information. Three modeling approaches were tested: a hierarchical Bayesian model, random forest models for each period analyzed (AM peak, midday, PM peak, overn ...
  • Report 26R49 Effect of Bridge Deck Placement Sequences on Cracking Performance Research Project Brief
    Report 26-R49: Effect of Bridge Deck Placement Sequences on Cracking Performance [Research Project Brief]
    Arce, Gabriel A. ;
    Ozyildirim, Celik
    2026-06-01 | PDF
    The objective of this study was to gain an understanding of the effect of bridge deck placement methods on bridge deck cracking performance.
  • How Bike Ridership Data Can Improve Bike Safety in Los Angeles
    How Bike Ridership Data Can Improve Bike Safety in Los Angeles
    Salazar, Anthony Kenzo
    2026-06-01 | PDF
    Biking is a crucial mobility option for cities as it is dramatically more space-efficient than cars. Los Angeles, however, has failed over the last ten years to increase the viability of biking, as the number of cyclist deaths and serious injuries has not changed, while ridership has stagnated, and may be decreasing. One reason for this may be that ...
  • Equestrian Transportation Safety in the Northeastern San Fernando Valley
    Equestrian Transportation Safety in the Northeastern San Fernando Valley
    Johnson, Milena
    ORCID ICON IMG
    2026-06-01 | PDF
    The Northeastern San Fernando Valley is a historic, passionate, and diverse equestrian community in suburban Los Angeles. It hosts approximately three-quarters of the equestrian population of the City of Los Angeles. Though the region has an extensive network of equestrian trails, many of these trails are unofficial, not clearly mapped, or lacking ...
  • Addressing Fly Ash Shortage with Limestone Calcined Clay Cement
    Addressing Fly Ash Shortage with Limestone Calcined Clay Cement
    Arce, Gabriel A. ;
    Jiang, Zhangfan
    2026-06-01 | PDF
    Virginia and many other states are experiencing increasing challenges related to the availability of traditional supplementary cementitious materials (SCMs), particularly fly ash. These shortages-with both seasonal and regional variability-threaten the consistency, cost, and performance of concrete used in the Virginia Department of Transportation' ...
  • Analyzing and Predicting Truck Travel Time Reliability
    Analyzing and Predicting Truck Travel Time Reliability
    Zhao, Mo ;
    Appiah, Justice
    2026-06-01 | PDF
    Truck travel time reliability (TTTR) is one of the most important performance measures for assessing freight movement on the interstates. The Virginia Department of Transportation (VDOT) and the Virginia Office of Intermodal Planning and Investment have been reporting TTTR and setting performance targets as required by the Federal Highway Administr ...
  • Environmental Scan of Community Transit Needs in Massachusetts
    Environmental Scan of Community Transit Needs in Massachusetts
    Coyle, Caitlin ;
    Somerville, Ceara
    2026-06-01 | PDF
    This report presents findings from the Environmental Scan of Community Transit Needs in Massachusetts, conducted for the Massachusetts Department of Transportation (MassDOT) Research Program. The study provides a statewide assessment of community transportation needs and mobility challenges across Massachusetts. The project included a structured en ...
  • Report 26R48 Emergency Routing Signs Pilot on the I81 Corridor in the Staunton Area Research Project Brief
    Report 26-R48: Emergency Routing Signs Pilot on the I-81 Corridor in the Staunton Area [Research Project Brief]
    Zhao, Mo ;
    Lan, Chien-Lun
    2026-06-01 | PDF
    Research Objectives: Assess how permanently-installed emergency routing signs affect detour activation time, staffing and resources needs, and incident management efficiency. •Evaluate how the signs influence driver route choice during incidents and work zone detours. •Document user experiences and identify opportunities to further improve detour o ...
  • Development of UASEnabled Bridge Deck Inspection System From Investigation to Implementation
    Development of UAS-Enabled Bridge Deck Inspection System From Investigation to Implementation
    Almasi, Pouya ;
    Zhang, Qianyun
    2026-05-31 | PDF
    We introduce a pilot study that is geared towards inaugurating a UAS-centric bridge inspection program, operating on a component-level approach, with the overarching goal of enhancing the caliber of bridge inspection methodologies within the confines of New Mexico. The envisioned program encompasses the formulation of UAS-based inspection strategie ...
  • Develop a Balanced Asphalt Mixture Design Procedure
    Develop a Balanced Asphalt Mixture Design Procedure
    Hossain, Md Saddam ;
    Tarefder, Rafi
    2026-05-25 | PDF
    Balanced Mix Design (BMD) is a performance-based approach that supplements the traditional Superpave volumetric mix design process with laboratory performance testing to achieve an appropriate balance between rutting resistance and cracking resistance. This study was conducted to develop a practical BMD framework and preliminary performance criteri ...
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