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US Transportation Collection

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 161 - 180 of 35753 results
  • 07037 Develop Models for Freight Flows and Commercial Travel Patterns within Texas Urban Regions Brief
    0-7037: Develop Models for Freight Flows and Commercial Travel Patterns within Texas Urban Regions [Brief]
    Morgan, Curtis ;
    Sivaraman, Vijayaraghavan
    2025-08-31 | PDF
    This project was initiated in order to develop a model/tool that could help the Texas Department of Transportation (TxDOT) and other transportation planners estimate and assess changes in freight traffic flow impacts on the Texas Highway Freight Network (THFN) much more quickly than conducting a Statewide Analysis Model run. The goal was to produce ...
  • Synthesis Develop Design Guidelines for Applications of Light Weight Aggregate in Embankments and Mechanically Stabilized Earth MSE Walls Evaluate Cost Benefit Performance Project Summary Report
    Synthesis: Develop Design Guidelines for Applications of Light Weight Aggregate in Embankments and Mechanically Stabilized Earth (MSE) Walls – Evaluate Cost Benefit & Performance [Project Summary Report]
    Zornberg, Jorge G. ;
    Morsy, Amr M
    2025-08-31 | PDF
    The research team conducted a thorough synthesis of the state of the practice of using lightweight fills in transportation infrastructure. This synthesis was accomplished through a review of the published literature, a survey of state DOT practices, an evaluation of case studies involving the use of various lightweight fills inside and outside Texa ...
  • Connecting the First and Last Mile A Systematic Review of Student Use of EScooters for FirstLastMile Connections to Public Transit
    Connecting the First and Last Mile: A Systematic Review of Student Use of E-Scooters for First/Last-Mile Connections to Public Transit
    Wilcox, Micah
    ORCID ICON IMG
    2025-08-31 | PDF
    Students on university campuses have several available options for travel, including cars, buses, and micromobility, the latter of which encompasses bicycles and more recently, shared e-scooters (e-scooters). E-scooters are lightweight, electric vehicles which can be rented or purchased easily. They offer an ideal option to close the first/last-mil ...
  • Whos to Blame for EScooter Collisions An Analysis of the Language Used in EScooter Collision Reporting
    Who’s to Blame for E-Scooter Collisions?: An Analysis of the Language Used in E-Scooter Collision Reporting
    Johnson, Milena
    ORCID ICON IMG
    2025-08-31 | PDF
    The growing popularity of electric scooters (e-scooters) in urban environments has led to increased media coverage on their perceived danger both to the rider and to other users of the roadway. Media surrounding traffic collisions has long been criticized by safety researchers and activists for implicitly assigning blame to more vulnerable road use ...
  • Synthesis Carbon Capture and Repurposing ByProducts Project Summary Report
    Synthesis: Carbon Capture and Repurposing By-Products [Project Summary Report]
    Rausch, Christopher ;
    Ferron, Raissa
    2025-08-31 | PDF
    The research team undertook a comprehensive, multi-method assessment of CCUS for transportation infrastructure applications. The researchers began with a technical review of CCUS methods used across industries, ranging from direct approaches such as pre-combustion, post-combustion, and direct air capture to indirect methods such as mineralization, ...
  • 07148 Develop Design Details for CRCP Whitetopping and Unbonded Overlays Summary
    0-7148: Develop Design Details for CRCP Whitetopping and Unbonded Overlays [Summary]
    Won, Moon ;
    Goehl, Darlene C
    2025-08-31 | PDF
    Existing design methodologies for concrete overlays often rely on outdated empirical approaches or complex mechanistic models that lack adequate field validation. This has resulted in a significant gap in practice, particularly the design of Continuously Reinforced Concrete Pavement (CRCP) overlays, for which no standardized procedure exists in man ...
  • Develop an Interactive Unit Price Estimation and Visualization Tool Project Summary Report
    Develop an Interactive Unit Price Estimation and Visualization Tool [Project Summary Report]
    Shahandashti, Mohsen ;
    Yasar, Mahmut
    2025-08-31 | PDF
    The primary objectives of this research project were to (1) conduct an overview analysis of factors affecting unit prices, (2) identify factors affecting unit prices in Texas, (3) create a unit price estimation database, (4) create a spatio-temporal unit price estimation model considering the factors affecting unit prices, (5) develop a GIS-based v ...
  • Develop Guidance for Sustainable Traffic Signal Operation Strategies to Support All Intersection Users Project Summary Report
    Develop Guidance for Sustainable Traffic Signal Operation Strategies to Support All Intersection Users [Project Summary Report]
    Machemehl, Randy ;
    Reynolds, Isabelle
    2025-08-31 | PDF
    The research team conducted a thorough review of the state of the art and state of the practice of complete street pedestrian and bicycle safety countermeasures. They developed a thorough review of techniques used to compute crash modification factors for safety countermeasures, including signal operations strategies. They produced a discussion of ...
  • Improving Testing Requirements in Item 300 of TxDOT Standard Specifications Project Summary
    Improving Testing Requirements in Item 300 of TxDOT Standard Specifications [Project Summary]
    Bhasin, Amit ;
    Goehl, Darlene
    2025-08-31 | PDF
    The goal of this project was to identify and update the tests and specifications in Item 300 as needed to ensure that the test methods and specifications are relevant, not redundant, and up-to-date. A review of most materials in Item 300 was in the scope of this project; however, crack sealers, asphalt-rubber binders, and recycling agents were not ...
  • Select High Risk Pedestrian Midblock Crossings and Perform Safety Evaluations for Developing Pedestrian Crossings Project Summary
    Select High Risk Pedestrian Midblock Crossings and Perform Safety Evaluations for Developing Pedestrian Crossings [Project Summary]
    Sharif, Hatim O. ;
    Dessouky, Samer
    2025-08-31 | PDF
    The researchers conducted a comprehensive literature review to evaluate the current state of practice surrounding crash rates and severity at midblock crossings. They examined technical reports and publications from transportation agencies, FHWA, NCHRP, and peer-reviewed journals. Findings were synthesized into a detailed summary of risk factors, p ...
  • Systematic and Quantitative Approaches to Assess the Probability of Extreme Weather and Resilience Risks for TxDOT Highways and Bridges Project Summary Report
    Systematic and Quantitative Approaches to Assess the Probability of Extreme Weather and Resilience Risks for TxDOT Highways and Bridges [Project Summary Report]
    Birt, Andrew ;
    Prozzi, Jorge
    2025-08-31 | PDF
    The research team undertook a multi-phase study to build a flood-based risk and resilience assessment framework: • Reviewed peer state TAMPs and literature to identify current practices, gaps, and opportunities for integrating resilience. • Selected flooding as the primary disturbance agent for analysis, given its significance in Texas and the avai ...
  • Feasibility Study of Unmanned Aerial Vehicle Imagery for Mapping Roadside Milkweeds and Nectaring Plants for the Monarch Butterfly
    Feasibility Study of Unmanned Aerial Vehicle Imagery for Mapping Roadside Milkweeds and Nectaring Plants for the Monarch Butterfly
    Pringle, Elizabeth ;
    Dilts, Tom
    2025-08-31 | PDF
    In this project, we sought to couple two imaging technologies, drones and vehicle-mounted cameras, with models using artificial intelligence to predict the location of milkweed plants in Northern Nevada. Milkweeds are weedy plants that frequently occur along roadsides, and they are the only food used by caterpillars of the monarch butterfly, whose ...
  • Synthesis Commercial AirCoupled Ground Penetrating Radar Systems to Be Used for Pavement Evaluations in Texas Project Summary Report
    Synthesis: Commercial Air-Coupled Ground Penetrating Radar Systems to Be Used for Pavement Evaluations in Texas [Project Summary Report]
    Ham, Suyun ;
    Ryu, Kyeong Rok
    2025-08-31 | PDF
    TxDOT initiated this project to identify and recommend a modern, vehicle-mounted air-coupled GPR system that better aligns with current and future pavement evaluation needs. The objective was to evaluate commercially available GPR systems in terms of technical performance, compatibility with existing workflows, long-term cost-effectiveness, and eas ...
  • Develop a RealTime Decision Support Tool for Urban Roadway Safety Improvements Project Summary Report
    Develop a Real-Time Decision Support Tool for Urban Roadway Safety Improvements [Project Summary Report]
    Das, Subasish ;
    Wu, Lingtao
    2025-08-31 | PDF
    The researchers undertook three major tasks to achieve the project’s objectives. In the first task, they focused on data conflation, integrating multiple data sources such as real-time traffic speed and volume data from the National Performance Management Research Data Set (NPMRDS), crash data from the Crash Records Information System (CRIS), weath ...
  • Evaluation of the Effect of Integral Waterproofing Agents Admixtures on Surface Resistivity Measurements Project Capsule
    Evaluation of the Effect of Integral Waterproofing Agents (Admixtures) on Surface Resistivity Measurements [Project Capsule]
    Hungria, Ricardo ;
    Rupnow, Tyson
    2025-08-27 | PDF
    The objectives of this study are to: 1. Determine the effect of incorporating waterproofing admixtures on the surface resistivity of concrete; and 2. Determine if the different admixture dosages can be optimized.
  • Youth Cruz Free: Fare Free Bus and Ridership Behavior among Santa Cruz County Teens [supporting dataset]
    Pike, Susan ;
    Affolter, Bailey
    2025-08-25 | ZIP
    Since the beginning of the twenty-first century, young people have become a considerable share of public transit users. However, younger representatives of this age group still face many barriers to access transit infrastructure and benefit from its service. This study examines a Youth Cruz Free program launched by the Santa Cruz METRO in March 202 ...
    Dataset
  • Illinois Highway Materials Sustainability Efforts 2024
    Illinois Highway Materials Sustainability Efforts 2024
    Senger, Kelly
    2025-08-25 | PDF
    The Illinois Department of Transportation (IDOT) continues to use a variety of reclaimed and recycled materials in highway construction. Recycled materials are used in highway construction to supplement aggregates, concrete, hot-mix asphalt (HMA), steel, and sealants, as well as for soil modification and pavement markings. This report summarizes th ...
  • Streamlining Permitting and Mitigation Processes to Improve SCDOT Project Delivery
    Streamlining Permitting and Mitigation Processes to Improve SCDOT Project Delivery
    Huynh, Nathan N. ;
    Wang, Jing
    2025-08-08 | PDF
    The South Carolina Department of Transportation (SCDOT) identified three areas that have significant effect on its ability to deliver projects on time and on budget: (1) inconsistent permit application submittals among consultants that led to delay in approval by the U.S. Army Corp of Engineers, (2) inability to consistently identify “red flags” ea ...
  • Roundabout Construction Using Precast Concrete in Virginia
    Roundabout Construction Using Precast Concrete in Virginia
    Hossain, M. Shabbir ;
    Ozyildirim, H Celik
    2025-08-01 | PDF
    Roundabouts are a special type of intersection that ensures continuous vehicle movement while maintaining slow and safe speeds. Many state departments of transportation are converting existing intersections into roundabouts, but roundabout construction can create significant traffic closures and disruptions. Thus, accelerated construction can be ve ...
  • Use of Nuclear Gauge for Construction Quality Control of Unbound Base Course Containing Reclaimed Asphalt Pavement
    Use of Nuclear Gauge for Construction Quality Control of Unbound Base Course Containing Reclaimed Asphalt Pavement
    Hossain, M. Shabbir ;
    Hoppe, Edward J
    2025-08-01 | PDF
    A recent study determined that the Virginia Department of Transportation (VDOT) can use up to 30% reclaimed asphalt pavement (RAP) in a pavement base aggregate layer without adverse effects on pavement performance. However, an effective quality-control protocol to monitor construction is needed to implement the use of RAP in the base course. The st ...
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