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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 461 - 480 of 36053 results
  • Drainage Area Limitations of Single Watershed Peak Flow Estimates from NRCS Methods
    Drainage Area Limitations of Single Watershed, Peak Flow Estimates from NRCS Methods
    Maughan, Timothy A ;
    Hotchkiss, Rollin H.
    2025-05-01 | PDF
    Most state Department of Transportation roadway design sections predict peak flow for culvert design using, amongst other approaches, Natural Resources Conservation Service (NRCS) TR-20 technology. Even though this technology is more than 50 years old, there are no clear guidelines for how large a single watershed drainage area may be while remaini ...
  • Joint Deterioration Synthesis Project Capsule
    Joint Deterioration Synthesis [Project Capsule]
    Hungria, Ricardo
    2025-05-01 | PDF
    Concrete pavements are built with joints to accommodate for shrinkage and to induce cracking in control locations. Proper joint type selection and application are key for adequate concrete pavement performance. Nevertheless, various challenges have been identified, including joint sealant loss, loss of subgrade support, joint faulting, poor load tr ...
  • Evaluation of WrongWay Driving Countermeasures at Kansas Urban and Rural Interstate Ramps
    Evaluation of Wrong-Way Driving Countermeasures at Kansas Urban and Rural Interstate Ramps
    Cunningham IV, Jack R ;
    Anderson, Samantha
    2025-05-01 | PDF
    Wrong-way driving (WWD) incidents and crashes are a serious concern for communities throughout the United States. WWD events typically occur at high travel speeds during low light conditions on roadways with limited horizontal maneuverability. These variables reduce driver reaction times and, in conjunction with other human factor variables that ca ...
  • Improving Maintenance of OpenGraded Friction Course in Louisiana
    Improving Maintenance of Open-Graded Friction Course in Louisiana
    Mayeux, Corey R ;
    Akentuna, Moses
    2025-05-01 | PDF
    Open-Graded Friction Course (OGFC) is a specialized asphalt concrete mixture used for thin-wearing courses, offering significant safety, economic, and environmental benefits. The porous structure of OGFC enhances drainage, reduces hydroplaning, and improves road visibility, particularly during wet weather conditions. Despite its potential advantage ...
  • Transportation Operations Center Operator Retention and Workload Mitigation Strategies
    Transportation Operations Center Operator Retention and Workload Mitigation Strategies
    Goodall, Noah J.
    2025-05-01 | PDF
    This study investigated strategies to mitigate the workload for and improve the retention of operators at the Virginia Department of Transportation’s (VDOT) Transportation Operations Centers (TOCs). The research involved a literature review, interviews with other state departments of transportation, observations of VDOT TOC operations, and intervie ...
  • A Playbook For CMGC Adoption in Transportation Projects
    A Playbook For CM/GC Adoption in Transportation Projects
    Pishdad, Pardis
    2025-05-01 | PDF
    The Construction Manager/General Contractor (CM/GC) project delivery method is gaining widespread adoption in the transportation sector due to its ability to integrate construction expertise early in the project lifecycle. This report serves as a playbook for CM/GC adoption in transportation projects, specifically tailored for the Georgia Departmen ...
  • Evaluation of WrongWay Driving Countermeasures at Kansas Urban and Rural Interstate Ramps Summary
    Evaluation of Wrong-Way Driving Countermeasures at Kansas Urban and Rural Interstate Ramps [Summary]
    Cunningham IV, Jack R ;
    Anderson, Samantha
    2025-05-01 | PDF
    Wrong-way driving (WWD) incidents and crashes are a serious concern for communities throughout the United States. WWD events typically occur at high travel speeds during low light conditions on roadways with limited horizontal maneuverability. These variables reduce driver reaction times and, in conjunction with other human factor variables that ca ...
  • Using the Transportation Security Index to Measure the Impact of Mobility Initiatives
    Using the Transportation Security Index to Measure the Impact of Mobility Initiatives
    Murphy, Alexandra K.
    ORCID ICON IMG
    2025-05-01 | PDF
    Using the Transportation Security Index to measure the impact of mobility initiatives.
  • Benchmarking Delta TC Tc for Wisconsin Materials
    Benchmarking Delta TC (∆Tc) for Wisconsin Materials
    Bennert, Thomas A. ;
    Rowe, Geoffrey
    2025-05-01 | PDF
    The purpose of the study was to evaluate the ΔTc parameter for potential inclusion in the WisDOT asphalt binder specifications for cracking potential. The research encompassed a literature review and extensive laboratory program consisting of both asphalt binder and mixture testing. Using the information and data collected, it was determined that Δ ...
  • SDDOT 2025 Statewide Customer Satisfaction Assessment
    SDDOT 2025 Statewide Customer Satisfaction Assessment
    Murray, Ryan
    2025-05-01 | PDF
    This report summarizes perceptions of the South Dakota Department of Transportation’s performance in delivering services to residents and key customer groups across South Dakota. It is the 10th in a series of surveys that track and monitor attitudes and needs among SDDOT customers, including the general public, farmers, emergency vehicle operators, ...
  • Low Shrinkage Concrete Mixtures for Arkansas
    Low Shrinkage Concrete Mixtures for Arkansas
    Ouoba, Shuyah ;
    Murray, Cameron D.
    2025-05-01 | PDF
    Drying shrinkage-induced cracking is a major concern for concrete bridge decks, compromising both durability and service life. This study, conducted for the Arkansas Department of Transportation (ARDOT), aimed to develop and evaluate low-shrinkage concrete mixtures using locally available aggregates. A literature review identified effective shrinka ...
  • Investigating the Longterm Frictional Properties and Establishing Aggregate Polishness Guidelines for Asphalt Surface Mixtures in Tennessee
    Investigating the Long-term Frictional Properties and Establishing Aggregate Polishness Guidelines for Asphalt Surface Mixtures in Tennessee
    Huang, Baoshan ;
    Zhong, Jingtao
    2025-04-30 | PDF
    The frictional properties of aggregates play a significant role in determining pavement skid resistance. To preserve natural aggregates, reclaimed asphalt pavement (RAP) has been widely used for decades. However, its application in pavement surface courses is restricted due to uncertainties about its frictional properties and other mechanical perfo ...
  • 07199 Identification of Needs and Strategies for First Responder Interactions with Automated Vehicles Summary
    0-7199: Identification of Needs and Strategies for First Responder Interactions with Automated Vehicles [Summary]
    Trefz, Bradley ;
    Ivie, Ray
    2025-04-30 | PDF
    The rapid deployment of automated vehicles (AVs) presents both opportunities and challenges, especially for first responders tasked with ensuring public safety during emergencies. This project addressed critical needs and strategies for interactions between first responders and AVs. The project sought to identify the needs and strategies for Texas ...
  • Impacts of Changing Agriculture Supply Chains on California Roads and Bridges
    Impacts of Changing Agriculture Supply Chains on California Roads and Bridges
    Chandra, Shailesh ;
    Herrera, Benny
    2025-04-28 | PDF
    Agriculture is a significant contributor to national, state, and regional economies. In 2020, California generated approximately $49.1 billion in agricultural cash receipts, comprising 13.7 percent of the nation (CA number 1). During the same year, agricultural production and processing industries accounted for 2.8 percent of the state's gross dome ...
  • 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 ...
  • Development and Testing of an Unmanned Aerial System UAS Cellular Wi Fi Repeater Phase 2
    Development and Testing of an Unmanned Aerial System (UAS) Cellular & Wi Fi Repeater: Phase 2
    Sim, Evan ;
    Duong, Anh
    2025-04-28 | PDF
    This report is part of AHMCT's research project "Development and Testing of an Unmanned Aerial System (UAS) Cellular & Wi Fi Repeater: Phase 2." The goal of this research is to expand upon the successful UAS aerial repeater that was created in Task 3280. The researchers evaluated several commercial off-the-shelf (COTS) vehicle routers and antennas ...
  • 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 ...
  • 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 ...
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