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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 761 - 780 of 36841 results
  • 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 ...
  • 2025 DMV Customer Satisfaction Survey
    2025 DMV Customer Satisfaction Survey
    May, Matthew ;
    McGinnis-Brown, Lantz
    2025-05-20 | PDF
    The Idaho Transportation Department’s Division of Motor Vehicles underwent major system modernization efforts over the past decade, including expansion of online service delivery and improvements to its DMV web portal. Boise State University’s Idaho Policy Institute assesses whether system changes are meeting customer needs and expectations to bett ...
  • 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 ...
  • Caltrans Traffic Operations Data Standards Implementation Recommendations
    Caltrans Traffic Operations Data Standards Implementation Recommendations
    Patire, Anthony D.
    2025-05-13 | PDF
    This report investigates the evolving landscape of data standards within the transportation ecosystem, emphasizing their critical role in enabling interoperability, safety, and innovation across Intelligent Transportation Systems (ITS). The report outlines a strategic approach for advancing transportation data interoperability, emphasizing the need ...
  • Advancing Accelerated Bridge Construction and Fabrication in Indiana
    Advancing Accelerated Bridge Construction and Fabrication in Indiana
    Duarte, Camila ;
    Thrall, Ashley P.
    2025-05-08 | PDF
    The aim of this research was to increase the use of the accelerated bridge construction (ABC) and accelerated bridge fabrication (ABF) in Indiana. Specific research objectives included: (1) understand barriers to implementing ABC and evaluate ABF capabilities in Indiana, (2) investigate the benefits and limits of various ABC/ABF strategies specific ...
  • 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 ...
  • Optimum Locations for the Benefits of Green Infrastructure GI on the NMDOT Transportation System
    Optimum Locations for the Benefits of Green Infrastructure (GI) on the NMDOT Transportation System
    Davis, Brennan ;
    McKenna, Chad
    2025-05-02 | PDF
    The purpose of this study is to develop a transparent, data-driven framework for evaluating GI suitability across a diverse set of candidate sites. By combining stakeholder input, field-based site assessments, and GIS-driven spatial analysis, the study identifies and evaluates 65 potential locations across New Mexico. Each site is ranked based on t ...
  • Developing Guidance on Leading Pedestrian Intervals and Curb Extensions to Improve Pedestrian Safety at Signalized Intersections [supporting dataset]
    Hurwitz, David ;
    Jashami, Hisham
    2025-05-02 | JSON
    Leading Pedestrian Intervals (LPIs) and Curb Extensions (CEs) are operational and geometric countermeasures that are designed to reduce pedestrian injuries and fatalities. While Oregon DOT implements both of these treatments, there is limited guidance on how to implement these options (separately or in combination with other treatments). The presen ...
    Dataset Supporting Files
  • 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 ...
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