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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 821 - 840 of 36841 results
  • Point Cloud Feature Extraction for ADA Ramp Compliance Assessment
    Point Cloud Feature Extraction for ADA Ramp Compliance Assessment
    Ghafourian, Amin ;
    Lee, Andrew
    2025-04-28 | PDF
    Automation can play a prominent role in improving efficiency, accuracy, and scalability in infrastructure surveying and assessing construction and compliance standards. This report presents a comprehensive framework for automation of geometric measurements and compliance assessment using point cloud data. The proposed approach integrates deep learn ...
  • Study to Understand the Influence of Emergency Vehicle Color Reflectance SigningArrow Boards and Lighting Configurations in Reducing Responder Involved Crashes
    Study to Understand the Influence of Emergency Vehicle Color, Reflectance, Signing/Arrow Boards, and Lighting Configurations in Reducing Responder Involved Crashes
    Agarwal, Nithin ;
    Srinivasan, Sivaramakrishnan (Siva)
    2025-04-23 | PDF
    This study aimed to reduce responder-involved crashes by improving the visibility and conspicuity of Road Ranger Service Patrol (RRSP) vehicles. The research combined a comprehensive literature review, a national survey of 44 agencies, and field testing of 16 distinct scenarios across three Florida highways (I-4, SR 429, and Florida Turnpike). Scen ...
  • Caltrans Risk Based Seismic Design RBSD Seismic Demand Parameters for Ordinary Bridge Columns in California
    Caltrans Risk Based Seismic Design (RBSD) – Seismic Demand Parameters for Ordinary Bridge Columns in California
    Singhal, Saurabh ;
    Zareian, Farzin
    2025-04-20 | PDF
    The Caltrans Risk-Based Seismic Design (CT-RBSD) framework is a performance-based bridge design methodology that uses reliability theory to assess the probability of seismic damage in bridge columns. Building on experimental fragility curves and statistical modeling, the approach enables engineers to design with explicit consideration of post-earth ...
  • Asphalt Paving Handbook 2025 Edition Updated With Video Links
    Asphalt Paving Handbook [2025 Edition Updated With Video Links]
    Buncher, Mark ;
    Gierhart, Danny
    2025-04-14 | PDF
    The purpose of this Asphalt Paving Handbook is to provide comprehensive technical information and best practices related to the paving of asphalt mixtures for both roadway and airfield projects. The goal is to keep the discussion focused on practical aspects that have the greatest effect on the quality and long-term performance of the finished pave ...
  • Evaluation of Remote Operation of TruckMounted Attenuator TmaEquipped Shadow Vehicles for Use in Caltrans Operations
    Evaluation of Remote Operation of Truck-Mounted Attenuator (Tma)-Equipped Shadow Vehicles for Use in Caltrans’ Operations
    Akbari, Ali ;
    Ravani, Bahram
    2025-04-08 | PDF
    This research project investigated the application of remote driving technology for Truck Mounted Attenuator (TMA) operations. TMAs are necessary to protect the working crew from errant vehicles in support of various maintenance functions. The problem is that the driver of the TMA is susceptible to injury in high-speed crashes. The motivation is to ...
  • Exploration of Color Patterns for Improving Work Zone Safety and Perception
    Exploration of Color Patterns for Improving Work Zone Safety and Perception
    Wu, Hongyue ;
    Wang, Ze
    2025-04-07 | PDF
    Work zone safety remains a persistent concern in the United States. Color patterns are an effective way to provide visual information for drivers. Existing studies explored the colors of work zone elements, while how the color patterns impact the drivers’ perception, information processing, and overall safety in work zones is missing. Therefore, th ...
  • Achieving MultiPurpose Roadside Vegetation Reducing Weed Invasion and Fire Risk while Enhancing Pollinator Habitat
    Achieving Multi-Purpose Roadside Vegetation: Reducing Weed Invasion and Fire Risk while Enhancing Pollinator Habitat
    Stewart, Erika ;
    Grinath, Josh
    2025-04-03 | PDF
    Roadside vegetation management efforts often target a single desirable outcome; however, we often have multiple management goals for restoration. Theoretically, multiple goals can be achieved by establishing native vegetation, but the efficacy of methods used to establish native plant communities are largely unclear. The overall objective of this r ...
  • 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 ...
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