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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 81 - 100 of 36841 results
  • Report R2646 Exploring the Use of VMT as an Evaluation Metric Within Virginias Transportation Planning Process Research Project Brief
    Report R26-46: Exploring the Use of VMT as an Evaluation Metric Within Virginia’s Transportation Planning Process [Research Project Brief]
    Ohlms, Peter B. ;
    Kim, Aden
    2026-06-01 | PDF
    The purpose of this study was to explore how VMT might be used as a transportation evaluation metric in Virginia, based on reviewing how VMT has been applied elsewhere and translating such uses to the Virginia context. The research explored how widespread VMT is in the United States; at what points in Virginia’s planning process could VMT analysis ...
  • Placement Options for InStreet Pedestrian Crossing Signs
    Placement Options for In-Street Pedestrian Crossing Signs
    Kothuri, Sirisha ;
    Monsere, Chris
    2026-06-01 | PDF
    This study evaluated the effects of R1-6a pedestrian crossing signs, installed in various configurations, on driver yielding behavior at uncontrolled marked crosswalks across six Oregon locations. The research analyzed both staged and naturalistic crossings under different experimental conditions, including baseline, tubular markers, single and mul ...
  • Oregon Traffic Safety Research Roadmap
    Oregon Traffic Safety Research Roadmap
    Griffin, Greg P. ;
    Roll, Josh F.
    2026-06-01 | PDF
    To address the rising increase in fatal and serious traffic injuries, the ODOT Traffic Safety Research Roadmap establishes a structured, five-year research agenda listing research concepts for funding through ODOT Research Unit’s annual funding cycle as well as other funding opportunities. The study identifies 51 priority traffic safety research ne ...
  • Recycled Binder Availability of Virginia RAP Materials and Its Effects on Asphalt Mixture Composition and Performance
    Recycled Binder Availability of Virginia RAP Materials and Its Effects on Asphalt Mixture Composition and Performance
    Kuchiishi, Kazuo ;
    Boz, Ilker
    2026-06-01 | PDF
    In Virginia, most asphalt mixtures contain reclaimed asphalt pavement (RAP), which may pose some challenges regarding asphalt pavement durability if these mixtures are not properly designed. One of the concerns is the uncertainty in the amount of RAP binder that is available, active, and effectively contributing to the total asphalt content of the ...
  • Entire Interior Culvert Lining With Engineered Cementitious Composites
    Entire Interior Culvert Lining With Engineered Cementitious Composites
    Arce, Gabriel A. ;
    Sharifi, Mary
    2026-06-01 | PDF
    Corrugated metal pipes make up a significant portion of Virginia’s culvert inventory and are prone to deterioration from corrosion and abrasion, particularly at the invert. In early stages, invert rehabilitation techniques such as invert paving are sufficient. However, at advanced stages of distress, full interior repair becomes necessary. In such ...
  • Report 26R44 Entire Interior Culvert Lining With Engineered Cementitious Composites Research Project Brief
    Report 26-R44: Entire Interior Culvert Lining With Engineered Cementitious Composites [Research Project Brief]
    Arce, Gabriel A. ;
    Sharifi, Mary
    2026-06-01 | PDF
    Research Objectives: The purpose of this laboratory and parametric study was to provide VDOT with practical sprayable ECCs and improved design guidance for the trenchless rehabilitation of CMPs, particularly for applications requiring repair of the entire culvert interior using SAPL.
  • Field Evaluation of Lightweight Noise Barriers and Development of Noise Barrier Inspection and Asset Management Program
    Field Evaluation of Lightweight Noise Barriers and Development of Noise Barrier Inspection and Asset Management Program
    Provines, Jason T.
    2026-06-01 | PDF
    Noise barriers along high-volume roads reduce traffic noise using either normal-weight materials, such as concrete or brick, or lightweight materials, such as metal, composites, fiberglass, or acrylic. Although the Virginia Department of Transportation's (VDOT) current concrete noise barriers have proven durable, some lightweight metal noise barrie ...
  • 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' ...
  • 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 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 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 ...
  • LongTerm Implications of Redecking Bridges With Prestressed Concrete Girders
    Long-Term Implications of Redecking Bridges With Prestressed Concrete Girders
    Adhikari, Beeva ;
    Lequesne, Rémy D.
    2026-06-01 | PDF
    Precast/prestressed concrete girders with cast-in-place decks are commonly used for bridge construction throughout the United States. However, girder lifespans exceed the lifespans of concrete decks, resulting in the need for deck replacement. This study surveyed United States Department of Transportation (DOT) engineers to determine common deck re ...
  • WebBased Tool to Advance Geotechnical Data Interchange and ReliabilityBased Site Characterization
    Web-Based Tool to Advance Geotechnical Data Interchange and Reliability-Based Site Characterization
    Gautreau, Gavin P. ;
    Peng, Xin
    2026-06-01 | PDF
    The Louisiana Department of Transportation and Development (DOTD) continues to improve its geotechnical data management policies and expand its use of digital data for geotechnical design. New advanced data-rich techniques and methodologies have been developed for geotechnical site characterization, including those recommended by the Advanced Geote ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 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 ...
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