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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 81 - 100 of 35412 results
  • An Intelligent HumanCentric Communication System for Adverse Weather and Road Conditions
    An Intelligent Human-Centric Communication System for Adverse Weather and Road Conditions
    Demir, Ibrahim ;
    Sermet, Yusuf
    2025-09-01 | PDF
    Adverse weather conditions present significant risks to motorists, making safe navigation challenging. Artificial intelligence (AI) advancements have facilitated the development of intelligent systems to address these concerns. This project introduces Conversational AI for Road Weather Information Systems (CARWIS), an AI-powered solution that provi ...
  • Balanced Mix Design Field Trial Projects in Alabama
    Balanced Mix Design Field Trial Projects in Alabama
    Sadeghi, Mohammad ;
    Hartzog, Zane
    2025-09-01 | PDF
    The Alabama Department of Transportation (ALDOT) is advancing Balanced Mix Design (BMD) to improve the durability, reliability, and cost-effectiveness of asphalt pavements. To support implementation, a field validation project was conducted on State Route 55 in Covington County, Alabama, using six asphalt mixtures designed to meet target thresholds ...
  • Development of a Simplified Methodology to Assess the Internal Redundancy of BoltedBuiltUp Tied Arch Members
    Development of a Simplified Methodology to Assess the Internal Redundancy of Bolted-Built-Up Tied Arch Members
    Farooq, Shah Zaib ;
    Korkmaz, Cem
    2025-09-01 | PDF
    Tied arch bridges represent a vital component of the nation's infrastructure, valued for their structural efficiency and aesthetic qualities. These bridges rely on arch ribs to transfer vertical loads into horizontal thrusts, which are counteracted by the tie beams (TBs) acting in axial tension. In addition to this axial tension, TBs are also subje ...
  • Effect of Asphalt Binder Source on Asphalt Mixture Performance
    Effect of Asphalt Binder Source on Asphalt Mixture Performance
    Mogawer, Walaa S. ;
    Rowe, Geoffrey
    2025-09-01 | PDF
    This study aims to identify point and shape rheological parameters that can effectively differentiate between high and low-quality asphalt binders, particularly in their resistance to intermediate-temperature cracking, regardless of binder source or formulation changes. Point parameters assess binder hardness, while shape parameters describe the bi ...
  • 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 ...
  • 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 ...
  • 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 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 ...
  • 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 ...
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