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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 421 - 440 of 36054 results
  • 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 ...
  • 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, ...
  • 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 ...
  • Reducing the Dependency on Chlorides and Impacts
    Reducing the Dependency on Chlorides and Impacts
    John, Ajuna P. ;
    Shin, Hoon C.
    2025-05-20 | PDF
    This study examined the performance and environmental impacts of various deicing materials, assessed their short-and long-term effects on infrastructure, soil, and water quality, and identified opportunities for operational improvement within INDOT’s winter maintenance practices. The study used a comprehensive methodology that included an extensive ...
  • Feasibility of Utilizing Native Grasses and Forbs in Lieu of Exotic Cool Season Grasses on Roadside RightsofWay
    Feasibility of Utilizing Native Grasses and Forbs in Lieu of Exotic Cool Season Grasses on Roadside Rights-of-Way
    Bollinger, Wesley ;
    Bhattarai, Rabin
    2025-05-15 | PDF
    We assessed the status of 34 native species plantings along roadsides in Indiana and Illinois and evaluated soil conditions, distance from road, and surrounding landscape cover to determine which factors led to successful long-term establishment of plantings. Cover by seeded native species and native species overall increased with distance from roa ...
  • 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 ...
  • NEXTGEN Concrete Tests of the Future Chloride and Sulfate Durability
    NEXTGEN Concrete – Tests of the Future: Chloride and Sulfate Durability
    Su, Dan ;
    Gurjar, Ashok H.
    2025-05-02 | PDF
    To enhance the durability of newly constructed structural elements, FDOT is seeking concrete mixes that are designed and approved based on element type and service conditions. As one of the most important concerns on concrete, the durability of concrete needs to be robustly assessed with a series of screening tests. Specifically, the chloride and s ...
  • Determining Percentage of Recycled Asphalt Pavement in Asphalt Mixtures Summary
    Determining Percentage of Recycled Asphalt Pavement in Asphalt Mixtures [Summary]
    Gao, Ya ;
    Jones, Christopher
    2025-05-01 | PDF
    Drum mix plants are the primary hot-mix asphalt (HMA) production plants for most Kansas Department of Transportation (KDOT) projects. In drum mix plants, a totalizer controls the input rate of virgin aggregates and recycled asphalt pavement (RAP). In current practice, the RAP percentage is determined by the input rate shown on the totalizer. Howeve ...
  • Determining Percentage of Recycled Asphalt Pavement in Asphalt Mixtures
    Determining Percentage of Recycled Asphalt Pavement in Asphalt Mixtures
    Gao, Ya ;
    Jones, Christopher
    2025-05-01 | PDF
    Drum mix plants are the primary hot-mix asphalt (HMA) production plants for most Kansas Department of Transportation (KDOT) projects. In drum mix plants, a totalizer controls the input rate of virgin aggregates and recycled asphalt pavement (RAP). In current practice, the RAP percentage is determined by the input rate shown on the totalizer. Howeve ...
  • Evaluation of Rock Check Dam Performance using LargeScale Testing Techniques
    Evaluation of Rock Check Dam Performance using Large-Scale Testing Techniques
    Roche, Brian G ;
    Perez, Michael A
    2025-05-01 | PDF
    Conveyance channels are commonly used on highway construction projects to manage the flow of water through the project to downstream discharge points or stormwater detention practices. However, these channels can be at risk of erosion before stabilization due to high-velocity flows. A common erosion control practice in channels is a rock check dam, ...
  • Evaluation of Stripping Tests for Asphalt Mixtures to Replace AASHTO T283 Method in Missouri
    Evaluation of Stripping Tests for Asphalt Mixtures to Replace AASHTO T283 Method in Missouri
    Buttlar, William G. ;
    Rath, Punyaslok
    2025-05-01 | PDF
    Currently, many paving agencies in the U.S. including the Missouri Department of Transportation (MoDOT) use the AASHTO T283 method (Tensile Strength Ratio (TSR) test) to determine the moisture damage susceptibility of asphalt mixtures. However, the TSR test has been shown to have a poor correlation with field results based on a review of literature ...
  • Illinois Department of Transportations Seeding Standards and Best Management Practices
    Illinois Department of Transportation’s Seeding Standards and Best Management Practices
    Bollinger, Wesley ;
    Bhattarai, Rabin
    2025-05-01 | PDF
    To provide evidence-based revisions to Section 250 of the Illinois Department of Transportation roadside specifications manual, we conducted a literature review, an experimental planting, and a survey of previously planted roadsides. We created newly designed native seed mixes and field tested these mixes in comparison with existing IDOT mixes. Aft ...
  • NETC AtaGlance Phase VII 2018 2025
    NETC At-a-Glance (Phase VII 2018 – 2025)
    Seeber, Kirsten ;
    Pulver, Jeff
    2025-05-01 | PDF
    The New England Transportation Consortium (NETC) is a research cooperative among the six New England transportation agencies: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island and Vermont. Since its inception in 1990, NETC has been a Federal Highway Administration (FHWA) pooled fund supported by federal State Transportation and Researc ...
  • Improving Guidance for Speed Safety Camera
    Improving Guidance for Speed Safety Camera
    Figliozzi, Miguel ;
    Wang, Haizhong
    2025-05-01 | PDF
    This report synthesizes speed safety camera elements, issues, best practices, and evidence-based results identified from a national and international review of jurisdictions employing speed safety cameras. Using these findings, this report provides recommendations to ODOT on changes and additions to the statewide speed safety camera program, as wel ...
  • Pavement MarkingColored Pavement Friction Differential and Product Durability
    Pavement Marking/Colored Pavement Friction Differential and Product Durability
    Marasteanu, Mihai O. ;
    Zanko, Lawrence M.
    2025-05-01 | PDF
    The frictional characteristics of pavement surfaces is a major component of safety. Pavement markings play a very important role in traffic flow and safety, but they also have different friction characteristics than pavement due largely to the spherical glass media needed to improve retroreflectivity for night visibility and the marking material it ...
  • Testing Analysis and Load Rating of Precast Prestressed Concrete Deck Beams with Transverse Cracks
    Testing, Analysis, and Load Rating of Precast Prestressed Concrete Deck Beams with Transverse Cracks
    Andrawes, Bassem ;
    Gunasekaran, Dachina
    2025-05-01 | PDF
    This study focused on understanding the impact of transverse cracks on the residual capacity and load rating analysis of in-service precast prestressed concrete (PPC) deck beams. Two decommissioned (33 × 36 and 21 × 36) PPC deck beams were tested under four-point bending loads to assess the impact of transverse cracks on the structural performance ...
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