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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 861 - 880 of 36841 results
  • Assessment of Laboratory Friction Testing Equipment and Validation of Pavement Friction Characteristics with Field and Accelerated Friction Testing
    Assessment of Laboratory Friction Testing Equipment and Validation of Pavement Friction Characteristics with Field and Accelerated Friction Testing
    Wu, Zhong ;
    Hungria, Ricardo
    2025-04-01 | PDF
    This report reviews the research and advancements in using the Three-Wheel Polishing Device (TWPD) for aggregate polishing and the Dynamic Friction Tester (DFT) to measure the polishing resistance of coarse aggregates in asphalt wearing course mixes. The Louisiana Department of Transportation and Development (DOTD) currently employs the British Pol ...
  • Experimental and Analytical Evaluation of Residual Capacity of CorrosionDamaged Prestressed Concrete Bridge Girders
    Experimental and Analytical Evaluation of Residual Capacity of Corrosion-Damaged Prestressed Concrete Bridge Girders
    Alfailakawi, Ali ;
    Roberts-Wollmann, C L
    2025-04-01 | PDF
    The durability of infrastructure components, such as prestressed concrete bridge beams, can be significantly affected by long-term deterioration associated with corrosion. Corrosion is a major concern for bridges in Virginia, due to the frequent use of deicing salts during the winter, as well as the number of structures in marine environments. The ...
  • Summary Report for Pooled Fund Program TPF 5343
    Summary Report for Pooled Fund Program TPF 5(343)
    Sheikh, Nauman M. ;
    Bligh, Roger P.
    2025-04-01 | PDF
    Established in 2016, the Roadside Safety Pooled Fund Program TPF 5(343) facilitated collaborative research among State Departments of Transportation (DOTs) to address challenges related to roadside safety features. The program prioritized research to support State DOTs in the implementation of the American Association of State Highway and Transport ...
  • Evaluation of Electronic Enforcement of Motor Carrier Compliance and Safety
    Evaluation of Electronic Enforcement of Motor Carrier Compliance and Safety
    Hernandez, Salvador ;
    Anderson, Jason C.
    2025-04-01 | PDF
    This study evaluates the implementation of electronic enforcement. A review of electronic enforcement technology was conducted, and best practices of electronic enforcement were documented. Using inspection and violation data, a statewide and site-specific analysis were conducted to determine violations that occurred most often. Upon identification ...
  • A Fatigue Assessment Framework for Steel Bridges Using Fiber Optic Sensors and Machine Learning
    A Fatigue Assessment Framework for Steel Bridges Using Fiber Optic Sensors and Machine Learning
    Soliman, Mohamed ;
    Mahmoud, Ahmed
    2025-04-01 | PDF
    This report discusses the results of a research project aiming at developing data-driven approaches for damage detection in steel bridges. The developed approaches utilize machine learning (ML) models coupled with strain data obtained from fiber optic sensors or traditional foil-type strain gauges to detect the damage. The report discusses the expe ...
  • Automated Assessment of Defects in Bridge Structures
    Automated Assessment of Defects in Bridge Structures
    Shafei, Behrouz ;
    Odeh, Ibrahim
    2025-04-01 | PDF
    Effective and timely bridge inspections are crucial for extending bridge lifespans and preventing catastrophic failures. Traditional inspection methods often involve manual visual assessments and can be time-consuming, labor-intensive, and prone to human error. Recent technological advancements in unmanned aerial vehicles (UAVs), artificial intelli ...
  • Safe System Research and Implementation Final Report
    Safe System Research and Implementation: Final Report
    Banerjee, Ipsita ;
    Luo, Qianhua
    2025-03-31 | PDF
    Fatal and serious injury (FSI) crashes in California have increased by 51.9% in the past decade. To curb this growth, Director’s Policy 36 was issued for Caltrans to adopt the Safe System Approach, an approach that has proven to reduce FSI crashes by large margins in countries and cities that have adopted it. Following this, two Safe System-aligned ...
  • Orange Contrasted Temporary Pavement Delineation in Construction Zones
    Orange Contrasted Temporary Pavement Delineation in Construction Zones
    Linke, Barbara ;
    White, Wilderich A.
    2025-03-31 | PDF
    The California Department of Transportation (Caltrans) needs to maintain safety on its roads, including during construction in work zones. Orange temporary striping promises to increase driver awareness of construction work zones. This project collected and analyzed quantitative and subjective data about driver behavior and traffic incidents over t ...
  • Battery Technologies for Current and Future HeavyDuty and Transit Electric Vehicles
    Battery Technologies for Current and Future Heavy-Duty and Transit Electric Vehicles
    Burke, Andrew F. ;
    Zhao, Jingyuan
    2025-03-14 | PDF
    This report examines the electrification of buses, vocational trucks, and construction machinery, as well as the impact of advancements in battery technology on this transition. The electrification of these vehicles and machinery, alongside rapid progress in battery development, is accelerating. This study provides a comprehensive review of current ...
  • Chemical Incident Reports Events Reported to the CSB Under the Accidental Release Reporting Rule Volume 2
    Chemical Incident Reports: Events Reported to the CSB Under the Accidental Release Reporting Rule [Volume 2]
    U.S. Chemical Safety and Hazard Investigation Board
    2025-03-12 | PDF
    Volume 2 covers 25 serious chemical incidents in 14 states: Arkansas, Alabama, California, Colorado, Connecticut, Illinois, Louisiana, Mississippi, Nebraska, Nevada, New Mexico, Ohio, Oklahoma and Texas. These serious incidents resulted in 7 fatalities, 23 serious injuries, and approximately $1 billion in property damage. The reports give the publi ...
  • Project Summary Automated Truck Mounted Attenuator ATMA
    Project Summary: Automated Truck Mounted Attenuator (ATMA)
    Minnesota. Department of Transportation
    2025-03-11 | PDF
    Connected and automated vehicle (CAV) technology has the potential to significantly increase work zone safety. Each day, MnDOT maintenance employees and contractors are at risk of being involved in crashes when performing road work. To mitigate this risk, MnDOT uses truck mounted attenuators – or crash cushions – to help protect roadside workers).
  • Division of Engineering Research OnCall ROC Task 08 Reexamining Level of Service as a Measure of Effectiveness for Roadway Improvements
    Division of Engineering Research On-Call (ROC) Task #08 - Re-examining Level of Service as a Measure of Effectiveness for Roadway Improvements
    Weiss, Jacob ;
    Buckmaster, Morgan
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    This report evaluates the effectiveness of Level of Service (LOS) as a metric for roadway improvements. The study examines alternative measures, such as Vehicle Miles Traveled (VMT) or Vehicle Hours Traveled (VHT) and other Measures of Effectiveness (MOE) to assess roadway performance beyond traditional peak-hour analyses. By analyzing practices fr ...
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    Fitzpatrick, Kay ;
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    2025-03-01 | PDF
    Posted speed limits (PSLs) are a highly complex issue involving engineering, human factors, and political and societal concerns. On a national level, recent research along with calls to change how speed limit are set, especially for city streets, have generated extensive discussion on future speed limit setting procedures. Recent Texas Department o ...
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