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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 481 - 500 of 36053 results
  • School Start Times Impact on Students Walking or Biking to School Safe Routes to School
    School Start Times Impact on Students Walking or Biking to School: Safe Routes to School
    Levin, Michael W. ;
    Nie, Jaoting
    2025-04-01 | PDF
    Some school districts schedule elementary schools with early start times for various reasons. Such start times sometimes necessitate travel before sunrise during winter months. Intuitively, this could potentially conflict with a desire for increased use of active transportation, e.g. from the Safe Routes to School program, to reduce motor vehicle t ...
  • Field Performance of FiberReinforced Concrete Overlays
    Field Performance of Fiber-Reinforced Concrete Overlays
    King, Daniel ;
    Yang, Bo
    2025-04-01 | PDF
    An increasing number of concrete overlay projects in Iowa and around the United States have used fiber-reinforced concrete (FRC) mixtures. Fibers provide residual strength to concrete mixtures, and concrete overlay design procedures currently assume that fiber reinforcement enhances fatigue life. A number of studies have suggested that fibers may o ...
  • Geospatial Toolkit for Rapid Assessment of PostWildfire Sedimentation Risks to Infrastructure
    Geospatial Toolkit for Rapid Assessment of Post-Wildfire Sedimentation Risks to Infrastructure
    David, Scott R ;
    Belmont, Patrick
    2025-04-01 | PDF
    The UDOT Post-Wildfire Geohazard Assessment Toolkit is a GIS-based toolset designed to evaluate post-wildfire sediment hazards. The toolkit integrates precompiled geospatial datasets with user-supplied burn severity data to estimate debris flow probability, sediment production, and sediment delivery to river networks. The geospatial toolkit include ...
  • Influence of Internal Curing on Concretes Permeability in Simulated Field Conditions
    Influence of Internal Curing on Concrete’s Permeability in Simulated Field Conditions
    Liu, Zhen ;
    Milla, Jose
    2025-04-01 | PDF
    The curing conditions stated in the AASHTO T358 standard require that concrete specimens remain fully saturated at all times in a moist room or cabinet prior to testing. These curing conditions obscure the true impact of internal curing. In order to assess the benefits of internal curing under more realistic condition, this study compared internall ...
  • An Investigation of the Factors Surrounding Crashes and Near Crashes of ADASEquipped Vehicles
    An Investigation of the Factors Surrounding Crashes and Near — Crashes of ADAS-Equipped Vehicles
    Reyes, Michelle L. ;
    Roe, Cheryl A
    2025-04-01 | PDF
    This project aimed to investigate the impact of advanced driver assistance systems (ADAS) in real-world crashes and near-crashes. The project considered the perspectives of motorists and law enforcement officers. A survey and interviews gathered information about the motorist's understanding of ADAS and the characteristics of the incident and the v ...
  • Job Access Agency Cost and VMT Impacts of Offering Microtransit Alongside Fixedroute Transit
    Job Access, Agency Cost, and VMT Impacts of Offering Microtransit Alongside Fixed-route Transit
    Hyland, Michael ;
    Pike, Susan
    2025-04-01 | PDF
    Public transit ridership has declined in major US cities over the past decade. Integrating traditional fixed-route transit with flexible microtransit has been proposed to enhance ridership, mobility, accessibility, and sustainability. This project surveyed California transit agencies on their microtransit services to identify challenges to integrat ...
  • Development of a Database for Successfully Performing Pavement Sections in Louisiana Brief
    Development of a Database for Successfully Performing Pavement Sections in Louisiana [Brief]
    Liu, Jun
    2025-04-01 | PDF
    Louisiana Transportation Research Center (LTRC) is frequently tasked with conducting forensic investigations of asphalt concrete (AC) pavement sections that have failed to meet performance expectations. However, thus far there have been limited efforts to identify and extract insights from pavement sections that have consistently surpassed expectat ...
  • The Effects of the COVID19 Pandemic on Transit in the San Francisco Bay Area Summary
    The Effects of the COVID-19 Pandemic on Transit in the San Francisco Bay Area [Summary]
    Lee, Richard W. ;
    Reinke, David B.
    2025-04-01 | PDF
    This report presents the findings from our study for the California State Assembly Transportation Committee on the effects of the COVID-19 pandemic on Bay Area Transit. The study consisted of a review of the literature on the effects of the pandemic on transit in the US, a detailed look at changes in ridership and economics for Bay Area transit age ...
  • Ahead of the Curve Course Updates and Conversions Summary
    Ahead of the Curve: Course Updates and Conversions [Summary]
    Bittner, Jason J.
    2025-04-01 | PDF
    The objective of this project is to update and transfer existing information into the AASHTO TTS format and make all courses 508 compliant. As part of the updates, it has been determined that it is necessary to develop an additional elective course on 508 compliance and accessibility.
  • Proactive Planning Tool to Reduce Wildfire Sedimentation Risks
    Proactive Planning Tool to Reduce Wildfire Sedimentation Risks
    David, Scott R ;
    Belmont, Patrick
    2025-04-01 | PDF
    The geospatial modeling framework includes Direct Geohazard Impact Tools, which estimate debris flow triggering rainfall intensities and sediment erosion along transportation corridors based on predicted wildfire burn severity scenarios, and Downstream Impact Tools, which assess sediment delivery from hillslope erosion and debris flows to river net ...
  • Asset Characterization Using Automated Methods Research Summary
    Asset Characterization Using Automated Methods [Research Summary]
    Kim, Sungyop ;
    Baker, Donald
    2025-04-01 | PDF
    Increasing and intensifying flood events pose serious challenges to highway agencies in maintaining water crossing assets and assessing potential flood hazards. This project aimed to develop an automated flood risk assessment program for small water crossing assets, focusing on culverts with less than a 20-foot span not listed in the 2023 National ...
  • Volumetric Measurement of Salt Piles Using Photogrammetry LiDAR and Depth Cameras
    Volumetric Measurement of Salt Piles Using Photogrammetry, LiDAR, and Depth Cameras
    Mohammadi, Abbas ;
    Mohammadi, Pouria
    2025-04-01 | PDF
    This report presents the findings of a study conducted by the Utah Department of Transportation (UDOT) to evaluate advanced volumetric measurement technologies for accurately assessing road salt piles. The motivation for this study stems from the limitations of traditional methods, such as visual estimation and truckload weighing, which are prone t ...
  • Evaluation of OneWay Flagging Operations
    Evaluation of One-Way Flagging Operations
    Larson, Shawn ;
    Runyan, Samuel L
    2025-04-01 | PDF
    One-way flagging operations in Utah are a balance between meeting the needs of UDOT and contractors by allowing time and space on the roadway for work to be done, while also meeting the needs of the traveling public. Currently, UDOT predicts queue lengths and travel time for such operations by using traffic models in order to effectively plan and m ...
  • Coarse Aggregate Deterioration in Granular Surfaces and Shoulders
    Coarse Aggregate Deterioration in Granular Surfaces and Shoulders
    Lamba, Kanika H ;
    Ashlock, Jeramy C.
    2025-04-01 | PDF
    The goal of this project was to characterize the relative performance and changes in microstructural and engineering properties for various types of coarse aggregates subjected to weathering as well as real and simulated traffic loads typical of granular surfaces and shoulders of Iowa roads. Through an extensive program of geotechnical laboratory t ...
  • Evaluation of BMD Surface Mixtures with Conventional and High RAP Contents Under LaboratoryScale and FullScale Accelerated Testing
    Evaluation of BMD Surface Mixtures with Conventional and High RAP Contents Under Laboratory-Scale and Full-Scale Accelerated Testing
    Habbouche, Jhony ;
    Tong, Bilin
    2025-04-01 | PDF
    Balanced Mix Design (BMD) is an asphalt mixture design method that replaces some aspects of traditional volumetric design with performance testing for the most common distresses, such as rutting and cracking. This approach provides an opportunity to properly design and produce engineered asphalt mixtures, including those with higher reclaimed aspha ...
  • Performance Acceptance and Performance Monitoring of Pavement Using Falling Weight Deflectometer FWD and International Roughness Index IRI
    Performance Acceptance and Performance Monitoring of Pavement Using Falling Weight Deflectometer (FWD) and International Roughness Index (IRI)
    Khajehvand, Maya ;
    Mamun, Abdulah Al
    2025-04-01 | PDF
    The Indiana Department of Transportation (INDOT) utilizes the International Roughness Index (IRI) and Falling Weight Deflectometer (FWD) data to prioritize pavement maintenance across interstates, state roads, and U.S. highways. While IRI measures ride quality and FWD assesses structural integrity, their threshold values vary by road type, reflecti ...
  • Develop a Tool for Sight Distance Analysis Using GIS and LiDAR Data
    Develop a Tool for Sight Distance Analysis Using GIS and LiDAR Data
    Zhou, Huaguo ;
    Yang, Fangjian
    2025-04-01 | PDF
    Intersection Sight Distance (ISD) plays a critical role in ensuring roadway safety, particularly at unsignalized intersections where the lack of adequate visibility can result in severe accidents. Traditional ISD assessment methods often rely on manual measurements, which can be time-consuming, costly, and prone to inaccuracies. This study aims to ...
  • Laboratory Investigation of Concretes for PartialDepth Link Slabs
    Laboratory Investigation of Concretes for Partial-Depth Link Slabs
    Sharifi, Mary ;
    Ozyildirim, Celik
    2025-04-01 | PDF
    Bridge deck joints frequently leak, leading to the infiltration of harmful chlorides and other solutions that accelerate the deterioration of beam ends, bearings, and substructures. To mitigate this costly maintenance issue and extend the service life of conventional bridges, the Virginia Department of Transportation has been using full-depth link ...
  • Safety Performance of Pavement Marking Retroreflectivity in Alabama
    Safety Performance of Pavement Marking Retroreflectivity in Alabama
    Zhou, Huaguo ;
    Hossain, Md Mahmud
    2025-04-01 | PDF
    The evaluation of pavement marking materials primarily relies on their retroreflectivity (RL) — a measure of how effectively they reflect vehicle headlights back toward the driver. State DOTs typically contract private firms to measure RL, often without accurate records of when markings were installed or restriped. Additionally, establishing the st ...
  • Impact of Start Time on Students Walking and Biking to School Research Summary
    Impact of Start Time on Students Walking and Biking to School [Research Summary]
    Levin, Michael W.
    2025-04-01 | PDF
    Some school districts schedule elementary schools with early start times for various reasons. Such start times sometimes necessitate travel before sunrise during winter months. Intuitively, this could potentially conflict with a desire for increased use of active transportation, e.g. from the Safe Routes to School program, to reduce motor vehicle t ...
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