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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 1421 - 1440 of 35865 results
  • Standardizing Environmental DNA Methodologies for Coho Salmon
    Standardizing Environmental DNA Methodologies for Coho Salmon
    Kinziger, Andrew ;
    Bjorkstedt, Eric
    2023-12-01 | PDF
    The California Department of Transportation (Caltrans) is mandated to conduct Federal Endangered Species Act (FESA) Section 7 and California Endangered Species Act (CESA) consultations for projects potentially impacting federally and state-listed species. Coho salmon (Oncorhynchus kisutch), listed under both FESA and CESA, require precise data on p ...
  • Traffic Safety Facts 2021 A Compilation of Motor Vehicle Traffic Crash Data
    Traffic Safety Facts 2021: A Compilation of Motor Vehicle Traffic Crash Data
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-12-01 | PDF
    In this annual report, Traffic Safety Facts 2021: A Compilation of Motor Vehicle Traffic Crash Data, the National Highway Traffic Safety Administration presents descriptive statistics about traffic crashes of all severities, from those that result in property damage to those that result in the loss of human life. Fatal traffic crash data from the F ...
  • Driver Comprehension of Flashing Yellow Arrows
    Driver Comprehension of Flashing Yellow Arrows
    Davis, Gary A. ;
    Stern, Raphael
    2023-12-01 | PDF
    In 2009, the FHWA’s Manual on Uniform Traffic Control Devices (MUTCD) introduced the flashing yellow arrow (FYA) traffic signal as an alternative to circular green (CG) to indicate permitted left turns. The FYA is arguably a more intuitive indication that left turns are permitted but not protected and, in addition, the FYA signal heads can support ...
  • Evaluating and Communicating the Benefits of Transportation Research Summary
    Evaluating and Communicating the Benefits of Transportation Research [Summary]
    Saeedi, Rahil ;
    Walker, Katie
    2023-12-01 | PDF
    Assessing the return on investment in transportation research is crucial to ensuring program goals are met, knowledge and technology are shared broadly, and future investigations are prioritized. A recent effort leveraged existing MnDOT and LRRB tools and processes to evaluate and communicate the value of innovation and research. A new benefit moni ...
  • An Investigation into Expansion Joint Movement for Integral Abutment Concrete Bridges
    An Investigation into Expansion Joint Movement for Integral Abutment Concrete Bridges
    Greenwood, Aaron T. ;
    Atadero, Rebecca
    2023-12-01 | PDF
    Expansion joints on bridge structures allow for essential thermal movements of structural components but often at the cost of regular maintenance and periodic replacement to counter damage the joint may experience throughout its lifecycle. This project was conducted to study the potential for eliminating or removing expansion joints for one of the ...
  • UASAssisted Inspection of Bridges for Corrosion Effects
    UAS-Assisted Inspection of Bridges for Corrosion Effects
    Tien, Iris ;
    Herndon, Hana
    2023-12-01 | PDF
    New technologies, such as unmanned aerial vehicles (UAVs) and machine learning, have been used to conduct imagery-based bridge inspections and evaluate damage on bridges. However, corrosion detection is still an open problem, and corrosion detection algorithms have only proven adequate in certain environments and conditions. The main goal of this p ...
  • Daytime Lighting in Short Tunnels
    Daytime Lighting in Short Tunnels
    Yang, Jidong J ;
    Yee, Tien
    2023-12-01 | PDF
    Daytime lighting is warranted when natural sunlight fails to provide sufficient visibility for tunnel users. According to the American Association of State Highway Transportation Officials (AASHTO) Roadway Lighting Design Guide, no supplemental lighting is required if the tunnel is less than 80 ft in length, whereas supplemental lighting is needed ...
  • Effectiveness of ITS on Utah Roadways
    Effectiveness of ITS on Utah Roadways
    Schultz, Grant G. ;
    Davis, Matthew C
    2023-12-01 | PDF
    This report presents the findings of a comprehensive research study conducted for the Utah Department of Transportation (UDOT) to evaluate the effectiveness of commonly deployed Intelligent Transportation System (ITS) treatments in Utah, with a focus on Variable Message Signs (VMS), traffic cameras, and Road Weather Information System(s) (RWIS) sit ...
  • Guidelines for the Implementation of a Statewide ATSPM System
    Guidelines for the Implementation of a Statewide ATSPM System
    Sunkari, Srinivasa R ;
    Chaudhary, Nadeem
    2023-12-01 | PDF
    Agencies that operate traffic signals now have an emerging tool to help them succeed in their day-to-day operations. The availability of high-resolution traffic signal data along with analysis tools has enabled these agencies to troubleshoot problems very quickly before they escalate into bigger issues and to maintain and update signal timings in a ...
  • Field Implementation of Concrete Strength Sensor to Determine Optimal Traffic Opening Time
    Field Implementation of Concrete Strength Sensor to Determine Optimal Traffic Opening Time
    Kong, Zhihao ;
    Lu, Na (Luna)
    2023-12-01 | PDF
    In the fast-paced and time-sensitive fields of construction and concrete production, real-time monitoring of concrete strength is crucial. Traditional testing methods, such as hydraulic compression (ASTM C 39) and maturity methods (ASTM C 1074), are often laborious and challenging to implement on-site. Building on prior research (SPR-4210 and SPR-4 ...
  • Production of CastinPlace UHPC for Bridge Applications
    Production of Cast-in-Place UHPC for Bridge Applications
    Hu, Jiong ;
    Morcous, George
    2023-12-01 | PDF
    This project presents a comprehensive overview of the essential aspects associated with the cast-in-place application of UHPC, including formwork requirements, surface preparation, mixing procedures, placing methods, curing techniques, grinding specifications, and mockup construction. Each section provides in-depth insights into specific guidelines ...
  • Performance Monitoring of Olmsted CR 117 and 104 and Aggregate Base Material Update
    Performance Monitoring of Olmsted CR 117 and 104 and Aggregate Base Material Update
    Hoegh, Kyle
    2023-12-01 | PDF
    A performance monitoring and forensic study was conducted on several test sections with varying base and pavement characteristics. This report includes the performance data from the current phase, which was extended until pavement reconstruction, with the previously reported data, collected since original construction of the test sections. Each of ...
  • Performance and Improvement of Texas Poor Boy Continuous Bridge Deck Details Project Summary Report
    Performance and Improvement of Texas Poor Boy Continuous Bridge Deck Details [Project Summary Report]
    Birely, Anna C. ;
    Hurlebaus, Stefan
    2023-12-01 | PDF
    The project team first investigated the performance of PBJs on 468 existing bridges in northwest and east Texas with data gathered from design drawings and inspection reports. Researchers used non-destructive evaluation techniques on PBJs on eight bridges to evaluate construction practices and potential damage.
  • Inspection of Flexible Filler Tendons
    Inspection of Flexible Filler Tendons
    Brown, Jeff R. ;
    Su, Dan
    2023-12-01 | PDF
    This research focused on developing an inspection protocol for post-tensioning (PT) ducts employing flexible filler materials for corrosion protection in bridge applications. Historically, cementitious grouts (CG) have been used to provide corrosion protection and bonding in PT systems. In contrast, flexible filler systems use wax or grease to main ...
  • Leading Indicators of Transportation Equity Equity in Planning
    Leading Indicators of Transportation Equity: Equity in Planning
    Lewis, Elyse O ;
    Gordon, Bethany M
    2023-12-01 | PDF
    This report was commissioned as part of the Washington Department of Transportation’s (WSDOT) Equity in Planning (EiP) project. It presents knowledge drawn from the transportation equity academic literature, practice-oriented literature, community engagement, geospatial (GIS) analysis, and a survey of planning professionals. The project aims to com ...
  • Development of Improved Redundancy Measure for the Colorado State Highway System
    Development of Improved Redundancy Measure for the Colorado State Highway System
    Jia, Gaofeng ;
    Bui, Kenny
    2023-12-01 | PDF
    The Colorado Department of Transportation (CDOT) has been working to improve the resiliency of its transportation system and facilities. A vital attribute of a resilient transportation system is whether the system has redundancies built into it. For example, if a roadway is closed to traffic, but there are alternative routes for the drivers to take ...
  • Integrating Human Behavior Toward the Development of Safer Cooperative Automated Transportation Implementation of SHRP2 Naturalistic Driving Study
    Integrating Human Behavior Toward the Development of Safer Cooperative Automated Transportation: Implementation of SHRP2 Naturalistic Driving Study
    Ahmed, Mohamed ;
    Das, Anik
    2023-12-01 | PDF
    Cooperative Automated Transportation (CAT), encompassing Connected Vehicles (CV), Autonomous Vehicles (AV), and Connected and Automated Vehicles (CAV), represents a transformative shift in the transportation landscape. CAT offers benefits such as improved safety, reduced congestion, enhanced traffic operations, increased productivity, and environme ...
  • Review of Illinois Multiple Stress Creep and Recovery Data for Future Implementation
    Review of Illinois Multiple Stress Creep and Recovery Data for Future Implementation
    Hajj, Ramez ;
    Asadi, Babak
    2023-12-01 | PDF
    The multiple stress creep recovery (MSCR) test, per AASHTO M 332, or as a supplement to M 320, has been widely implemented across the United States and in other parts of the world for assessing the rutting resistance of asphalt binder. Meanwhile, the Illinois Department of Transportation (IDOT) has conducted wide-ranging MSCR testing since 2006 but ...
  • Regional Emergency Evacuation Analysis in Traffic With Connected and Autonomous Vehicles
    Regional Emergency Evacuation Analysis in Traffic With Connected and Autonomous Vehicles
    Lu, Pan ;
    Huang, Ying
    2023-12-01 | PDF
    In an ever-evolving world characterized by environmental challenges and technological advancements, the confluence of natural disasters, particularly increasing wildfire threats, and the role of connected and autonomous vehicles (CAVs) stands as a critical focal point for research and innovation. This study embarks on a comprehensive exploration of ...
  • Regional Emergency Evacuation Analysis in Traffic With Connected and Autonomous Vehicles Research Brief
    Regional Emergency Evacuation Analysis in Traffic With Connected and Autonomous Vehicles [Research Brief]
    Lu, Pan ;
    Huang, Ying
    2023-12-01 | PDF
    Researchers focused on three research issues: 1) predicting and making recommendations for future evacuations under wildfire conditions using connected vehicle data, 2) driving behaviors in wildfire evacuations, and 3) autonomous vehicle perceptions in winter conditions. This research addresses the urgent need for enhanced emergency evacuation stra ...
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