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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 341 - 360 of 35811 results
  • Nebraska Balanced Mix Design Phase II
    Nebraska Balanced Mix Design – Phase II
    Yazdipanah, Farzad ;
    Khedmati, Mahdieh
    2025-05-31 | PDF
    This study aimed to propose a performance-based framework to evaluate highly recycled asphalt mixtures containing polymer-modified binders for potential use in a balanced mix design (BMD) specification in the state of Nebraska. For that, loose and compacted mixtures were directly collected from plant and field projects within a benchmarking study, ...
  • Effectiveness Monitoring of CTDOT Conservation Areas Pollinator Habitat Survey
    Effectiveness Monitoring of CTDOT Conservation Areas: Pollinator Habitat Survey
    Legrand, Ana
    2025-05-31 | PDF
    A pollinator habitat survey project was conducted in 2023 and 2024 to determine the effectiveness of CTDOT reduced mowing and late season mowing practices in designated conservation areas. The project evaluated the presence of milkweed resources for monarch butterflies and of nectar resources for pollinators in general. The Candidate Conservation A ...
  • Study the Impacts of Caltrans Thermoplastic Stripe Markings and Pavement Markers to Microplastic Pollution and Develop Potential Solutions
    Study the Impacts of Caltrans Thermoplastic Stripe, Markings and Pavement Markers to Microplastic Pollution and Develop Potential Solutions
    Asvapathanagul, Pitiporn ;
    Gedalanga, Philip
    2025-05-31 | PDF
    Microplastic (MP) pollution has emerged as a critical environmental concern due to its pervasive presence and harmful impacts on human and environmental health. MPs, defined as plastic particles ranging from 1 nm to 5 mm, are problematic because of their ability to disperse widely across ecological habitats. Recent studies have illuminated roadways ...
  • California Partners for Advanced Transportation Technology PATH Research Program Management
    California Partners for Advanced Transportation Technology (PATH) Research Program Management
    Fishelson, James ;
    Moura, Scott
    2025-05-29 | PDF
    California Partners for Advanced Transportation Technology (PATH) was founded in 1986, as a partnership between the California Department of Transportation (Caltrans) and the University of California. PATH is a statewide research program in Intelligent Transportation Systems (ITS) focusing on improving safety, system performance, accessibility, and ...
  • Evaluation of Mobile Robot Teams for Security of Caltrans Equipment Yards and Maintenance Stations
    Evaluation of Mobile Robot Teams for Security of Caltrans Equipment Yards and Maintenance Stations
    Sisi, Saeid Delshad ;
    Linke, Barbara
    2025-05-20 | PDF
    The California Department of Transportation (Caltrans) owns many medium-to-large equipment yards and maintenance stations. Vehicles are often stored in these fenced and secure yards. However, Caltrans still experiences vehicle component theft from these yards. In recent years, there has been a significant increase in theft at Caltrans facilities. T ...
  • Waterline Pile Cap Footings for Bridges Using Large Diameter FRP Reinforcing Material Characterization and Design
    Waterline Pile Cap Footings for Bridges Using Large Diameter FRP Reinforcing – Material Characterization and Design
    Nanni, Antonio ;
    De Caso, Francisco
    2025-05-13 | PDF
    The durability of coastal bridge structures is significantly impacted by the corrosion of steel reinforcement, particularly in waterline pile cap footings exposed to aggressive marine environments. This study investigates the feasibility of using large-diameter glass fiber-reinforced polymer (GFRP) bars as a corrosion-resistant alternative to tradi ...
  • Racial Segregation in Pasadena The Role of Freeway Development and Institutional Mechanisms
    Racial Segregation in Pasadena: The Role of Freeway Development and Institutional Mechanisms
    Ong, Paul M ;
    Pech, Chhandara
    2025-05-07 | PDF
    This study documents the historical and current patterns of racial/ethnic residential segregation in Pasadena, examining the role of freeways and other mechanisms in shaping these outcomes. Using quantitative data, this project compares racial segregation in Pasadena with that in the rest of Los Angeles County and analyzes demographic changes in th ...
  • RiskBased MultiThreat DecisionSupport Methodology for LongTerm Bridge Asset Management Volume 2 Networklevel Decision Support
    Risk-Based Multi-Threat Decision-Support Methodology for Long-Term Bridge Asset Management — Volume 2: Network-level Decision Support
    Ghavidel, Alireza ;
    Mashrur, Naqib
    2025-05-03 | PDF
    In the Volume 2 report, the bridge-level AI-based maintenance decision policy previously developed in the Volume 1 report is further integrated into a network-level decision support framework, by considering network-level budget and resource constraints. A Pareto Frontier based ranking approach is proposed to rank the maintenance projects suggested ...
  • Improving MDOTs Movable Bridge Reliability and Operations
    Improving MDOT’s Movable Bridge Reliability and Operations
    Kohler, Jonathan ;
    Longfield, Matt
    2025-05-02 | PDF
    The Michigan Department of Transportation owns and operates twelve movable bridges, comprised of eleven bascule bridges and one vertical-lift bridge. These bridges often have electrical and mechanical component failures or malfunctions which can cause unplanned maintenance, traffic disruptions, and navigational disruptions. This research evaluates ...
  • 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 ...
  • Evaluation of PostMounted Delineators and Curve Warning Message Markings Phase 1 Designing a Sampling Plan
    Evaluation of Post-Mounted Delineators and Curve Warning Message Markings Phase 1: Designing a Sampling Plan
    Appiah, Justice ;
    Cho, Hyun W.
    2025-05-01 | PDF
    In 2022, the Virginia Transportation Research Council published Guidance for and Effectiveness of Low-Cost Delineation Treatments, a report that evaluated the effectiveness of several low-cost delineation countermeasures (Flintsch et al., 2022a). That report recommended that the Virginia Department of Transportation (VDOT) consider a pilot study of ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Improving Maintenance of OpenGraded Friction Course in Louisiana Summary
    Improving Maintenance of Open-Graded Friction Course in Louisiana [Summary]
    Mayeux, Corey R
    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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • A Scheduling Assistant Toolkit for GDOTs Effective Planning of Transportation Projects
    A Scheduling Assistant Toolkit for GDOT’s Effective Planning of Transportation Projects
    Pishdad, Pardis ;
    de la Garza, Jesus M
    2025-05-01 | PDF
    The Scheduling Assistant Toolkit was developed to enhance the Georgia Department of Transportation’s (GDOT) project scheduling efficiency by providing data-driven recommendations on optimal activity overlapping strategies. Traditional scheduling methods often rely on finish-to-start dependencies, leading to unnecessarily long project durations and ...
  • Construction Cost Inflation Model
    Construction Cost Inflation Model
    Colsch, Nick
    2025-05-01 | PDF
    Federal legislation requires state departments of transportation to consider and apply inflation to the costs of transportation projects. However, there is no guidance on how inflation should be calculated. Previous research on this topic primarily focused on developing construction cost indexes. Previous methods of prediction included neural netwo ...
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