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rosaP Repository & Open Science Access Portal

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 581 - 600 of 36368 results
  • 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 Extent of WrongWay Driving Events and Identifying WrongWay Driving Hotspot Roadway Segments and Lone Wolf Exits with High WrongWay Driving Risk on Idaho HighSpeed Roadways
    Investigating the Extent of Wrong-Way Driving Events and Identifying Wrong-Way Driving Hotspot Roadway Segments and Lone Wolf Exits with High Wrong-Way Driving Risk on Idaho High-Speed Roadways
    Al-Deek, Haitham ;
    Sandt, Adrian
    2025-05-01 | PDF
    This project investigated the extent and characteristics of wrong-way driving (WWD) on Idaho limited access roadways. WWD crash (WWC) counts have been increasing in recent years, especially on I-84 and I-90. A model was developed to identify WWD hotspot segments by predicting WWCs based on non-crash WWD citations, exit design characteristics, traff ...
  • Demonstrating the Use of Small Uncrewed Aircraft Systems Drones Capabilities and Data for Iowa Transportation and Infrastructure Work Pilot Project No 1 Use of Small Uncrewed Aircraft Systems for Hairline Crack Detection on Bridge Deck
    Demonstrating the Use of Small Uncrewed Aircraft Systems (Drones) Capabilities and Data for Iowa Transportation and Infrastructure Work: Pilot Project No. 1 – Use of Small Uncrewed Aircraft Systems for Hairline Crack Detection on Bridge Deck
    Oguntoye, Kunle ;
    Sourav, Md Abdullah All
    2025-05-01 | PDF
    The increasing use of small uncrewed aircraft systems (sUAS), also known as drones, significantly benefits transportation agencies through reduced costs, enhanced safety, and improved productivity. The Iowa Department of Transportation (DOT) desires to use this technology in routine engineering practices, and this pilot study evaluated the effectiv ...
  • 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 ...
  • 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 ...
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