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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 1781 - 1800 of 36873 results
  • Standard Method of Test for Mechanical Rocker Ice Melting
    Standard Method of Test for Mechanical Rocker Ice Melting
    Nazari, Mehdi Honarvar ;
    Jamal, Mueed
    2024-02-01 | PDF
    Winter road maintenance provides significant safety and economic benefits during adverse winter weather conditions. Chemicals are commonly used prior, during and after storms to provide better road conditions through a variety of mechanisms. The solid deicer most used by State departments of transportation (DOTs) is sodium chloride (NaCl), but the ...
  • Developing Load Distribution Formula for Louisiana CastinPlace Reinforced Concrete Box Culverts
    Developing Load Distribution Formula for Louisiana Cast-in-Place Reinforced Concrete Box Culverts
    Okeil, Ayman M. ;
    Jafari, Navid H
    2024-02-01 | PDF
    This report summarizes the results from an investigation of the behavior of cast-in-place (CIP) reinforced concrete (RC) box culverts. Load rating of CIP-RC box culverts has been a challenge for Departments of Transportation (DOTs) across the nation, including in Louisiana. Excessive conservatism built into the American Association of State Highway ...
  • Best Practices for Work Zone Safety During Traffic Control Placement Removal and Modification Phase II
    Best Practices for Work Zone Safety During Traffic Control Placement, Removal, and Modification – Phase II
    Gambatese, John A. ;
    Moeung, Serey Raksa
    2024-02-01 | PDF
    The set-up, removal, and modification of temporary work zone traffic control on multi-lane, high-speed roadways can create hazardous exposures for workers and motorists. A comprehensive literature review on the topic reveals a lack of a standard process and detailed guidance for setting up and removing traffic control. This study aimed to investiga ...
  • Assessment of HighwayRailroad Grade Crossing Strategies Countermeasures and Technologies to Improve Traffic Safety and Mobility in Florida
    Assessment of Highway-Railroad Grade Crossing Strategies, Countermeasures, and Technologies to Improve Traffic Safety and Mobility in Florida
    Lin, Pei-Sung ;
    Wang, Zhenyu
    2024-02-01 | PDF
    Highway-rail grade crossings (HRGCs) are conflict areas for trains and road users, which present a significant safety concern in Florida. The HRGCs not only affect safety but also have a significant impact on traffic operations. FDOT explored several strategies to improve safety and mobility related to railroad grade crossings, including signage, p ...
  • Exploration of UHPC Applications for Montana Bridges
    Exploration of UHPC Applications for Montana Bridges
    Starke, James ;
    Matteson, Kirsten
    2024-02-01 | PDF
    The following research project explores bridge applications of ultra-high performance concrete (UHPC). Bridge deterioration, including decks and other members, is a problem across Montana and UHPC overlays and patching/repairing have been found to be viable alternatives to bridge/element replacement. The current study began with a literature review ...
  • A Comparison of Department of Transportation Progress Scheduling Specifications From Across the Nation Tech Transfer Summary
    A Comparison of Department of Transportation Progress Scheduling Specifications From Across the Nation [Tech Transfer Summary]
    Shane, Jennifer S.
    ORCID ICON IMG
    2024-02-01 | PDF
    The central objective of this research was to help the Iowa Department of Transportation (DOT) revise its progress scheduling specifications in a way that meets its core mission objectives while improving the practicality and efficiency of project management for contractors.
  • Microsimulation Department Assessment and Guidance Summary
    Microsimulation: Department Assessment and Guidance [Summary]
    Hill, Thomas ;
    Hadi, Mohammad
    2024-02-01 | PDF
    The goal of this research project was to provide guidance and direction to improve FDOT’s microsimulation modeling practice.
  • Seat Belt Use in 2023 Overall Results Traffic Safety Facts Research Note
    Seat Belt Use in 2023 – Overall Results [Traffic Safety Facts - Research Note]
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-02-01 | PDF
    The national estimate of seat belt use by adult front-seat passengers in 2023 was 91.9 percent, a record high although not statistically different (at the 0.05 level) from 91.6 percent observed in 2022. The seat belt use rate estimate represents the percentage of occupants who are belted during an average daylight moment. The 2023 data collection o ...
  • Eastern Massasauga Rattlesnake Sistrurus catenatus Detection and Space Use Near Roads in the Southern Lower Peninsula of Michigan USA
    Eastern Massasauga Rattlesnake (Sistrurus catenatus) Detection and Space Use Near Roads in the Southern Lower Peninsula of Michigan, USA
    Rajewski, Jillian A ;
    Campa III, Henry R
    2024-02-01 | PDF
    Roads are a source of mortality for federally threatened eastern massasauga rattlesnakes (EMR; Sistrurus catenatus) in Michigan. However, a clear understanding of space use and habitat selection of EMR near roads is lacking. Identifying when, where, and why EMR use spaces near roads could inform decisions that reduce the risk of road-related mortal ...
  • A Framework for Field Inspection of Inservice FRP ReinforcedStrengthened Concrete Bridge Elements
    A Framework for Field Inspection of In-service FRP Reinforced/Strengthened Concrete Bridge Elements
    Mehrabi, Armin ;
    Dolati, Seyed Saman Khedmatgozar
    2024-02-01 | PDF
    The main objective of this project is to develop the framework for inspection and condition assessment of in-service FRP reinforced/strengthened concrete (FRP-RSC) bridge elements. The framework applies to both FRP reinforced structures (FRP internal application) and FRP strengthened structures (FRP external application) and conforms with National ...
  • Measuring the Livability Framework Transportation Research Synthesis
    Measuring the Livability Framework [Transportation Research Synthesis]
    Maze, Haila ;
    Flannery, Cody
    2024-02-01 | PDF
    The Minnesota Department of Transportation (MnDOT) Office of Livability established the Livability Framework to guide transportation policies, programs, and/or projects toward improved, people-focused outcomes. The Livability Framework proposes seven (7) Livability Pillars to be considered as part of the planning and implementation of these activit ...
  • Examining Data Needs and Implementation Process of AVBased Microtransit Service A Case Study in Lake Nona Summary
    Examining Data Needs and Implementation Process of AV-Based Microtransit Service: A Case Study in Lake Nona [Summary]
    Schoelzel, Paul ;
    Peng, Zhong-Ren
    2024-02-01 | PDF
    The objectives of this project were to 1) examine the AV-based microtransit service in the Lake Nona neighborhood of Orlando, Florida called Move Nona and 2) develop a framework for examining various aspects of the system, including policy and government support, infrastructure and technology, service and management, financial sustainability, and r ...
  • Transportation Infrastructure Asset Monitoring Through the Industrial InternetofThings
    Transportation Infrastructure Asset Monitoring Through the Industrial Internet-of-Things
    Jordan, Patrick ;
    Moreno, John
    2024-02-01 | PDF
    The Internet-of-Things (IoT) is a rapidly growing area of wireless communication technology that allows devices to communicate with computers and humans via the Internet. This technology goes far beyond simply connecting devices to the internet, it creates opportunities to combine data from these devices with automated systems for the purpose of an ...
  • Hydrated Lime and Liquid AntiStrip Additives MoistureInduced Damage Resistance Study
    Hydrated Lime and Liquid Anti-Strip Additives: Moisture-Induced Damage Resistance Study
    Anderson, Howard ;
    Allen, Clark
    2024-02-01 | PDF
    Stripping is a critical surface and or subsurface pavement distress affecting asphalt pavements and is caused by moisture infiltration and stressed by freeze-thaw cycles and traffic loading, leading to the loss of bond or adhesion between the aggregate and the asphalt binder. UDOT has used 1 percent hydrated lime by slurry pugmill mixing in all our ...
  • Guidebook for Application of PolymerModified Asphalt Overlays From DecisionMaking to Implementation
    Guidebook for Application of Polymer-Modified Asphalt Overlays: From Decision-Making to Implementation
    Sassani, Alireza ;
    Lawal, Abdulazeez
    2024-02-01 | PDF
    After the successful experiences of multiple transportation agencies in adopting the usage of polymer-modified asphalt (PMA) cement overlays, now is the time to advocate for the implementation of this pavement preservation technique. Despite the affirmative endorsements from numerous departments of transportation (DOT), a structured process for sys ...
  • Using GIS to Highlight Highway Segments Sensitive to Deicing Material
    Using GIS to Highlight Highway Segments Sensitive to Deicing Material
    Gallagher, Mark ;
    Lovel, Rick
    2024-02-01 | PDF
    To identify roadway-adjacent areas that are likely to have a greater sensitive to deicing chemicals, specifically chlorides, this project conducted a literature search to describe the effects of deicing chemicals, the factors which mitigate or increase their impacts, and constructed a geospatial model that uses a variety of descriptive data to esti ...
  • Evaluation of Spring Load Restriction Removal Protocols
    Evaluation of Spring Load Restriction Removal Protocols
    Miller, Heather ;
    Orr, David P.
    2024-02-01 | PDF
    Deciding when to remove spring load restrictions (SLRs) on roadways is complicated given the variable time window during and after thawing when excess moisture remains in the base and subgrade layers, causing the overall roadway structure to remain weak. The main objective of this project was to develop an economical and easy-to-use protocol for ti ...
  • Traffic Safety Evaluation of Lane Constrictor Intersections in Minnesota
    Traffic Safety Evaluation of Lane Constrictor Intersections in Minnesota
    Moreland, Max ;
    Leuer, Derek
    2024-02-01 | PDF
    Between 2018 and 2019, MnDOT installed a lane constrictor design at 66 side-street, stop-controlled intersections in Minnesota. The lane constrictor design narrows the lane width for mainline approaches via a striped median with centerline rumble strips. By narrowing the mainline lane, the goal of this design is to encourage mainline traffic to slo ...
  • Evaluation of Spring Load Restriction Removal Protocols Brief
    Evaluation of Spring Load Restriction Removal Protocols [Brief]
    Miller, Heather
    2024-02-01 | PDF
    An economical and easy-to-use protocol for timing removal of spring load restrictions was developed based on knowledge about a roadway’s structure, base layers, and subgrade soils and the approximate depth to the groundwater table.
  • Analyzing Human Mobility for Active Transportation Planning in Louisiana
    Analyzing Human Mobility for Active Transportation Planning in Louisiana
    Bian, Ruijie “Rebecca” ;
    Tolford, Tara
    2024-02-01 | PDF
    Existing walking and biking data are often insufficient to support active transportation planning activities. This study utilized an emerging large-scale human mobility dataset to identify places with a higher number of short-distance trips to non-residential locations. These locations are more likely to be served by active modes of transportation, ...
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