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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 101 - 120 of 36022 results
  • NHTSA Field Crash Investigation 2024 Nonmotorist Coding and Editing Manual
    NHTSA Field Crash Investigation 2024 Nonmotorist Coding and Editing Manual
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2025-12-01 | PDF
    NHTSA’s field crash investigation-based data collection programs use the Crash Investigation Sampling System (CISS), Special Crash Investigations (SCI), and the Crash Injury Research & Engineering Network (CIREN) to collect detailed crash data to help scientists and engineers analyze motor vehicle crashes and injuries. CISS collects data on a repre ...
  • CenDak Signalized Intersections Traffic Data Collection 2025
    CenDak Signalized Intersections Traffic Data Collection – 2025
    Sharma, Kshitij
    2025-12-01 | PDF
    This project spanning the year 2025 set up 17 additional City intersections, raising the total locations reporting data to 19. Note that similar to the NDDOT sponsored pilot project, this phase of traffic data collection and reporting used existing infrastructure without the need to purchase or maintain any additional traffic data collection device ...
  • New NearFault Adjustment Factors for Caltrans Seismic Design Criteria SDC
    New Near-Fault Adjustment Factors for Caltrans Seismic Design Criteria (SDC)
    Mazzoni, Silvia ;
    Zengin, Ersa
    2025-12-01 | PDF
    This report covers analyses of Caltrans’ near-fault adjustment factors as recommended in the Caltrans Seismic Design Criteria. The report has two large chapters. Chapter 1 builds on prior the University of California Los Angeles studies that performed probabilistic seismic hazard analyses at numerous California sites across a range of return period ...
  • Thermally Conductive Pre-cast Concrete Pavement for Urban Heat Island Mitigation [supporting dataset]
    Radwan, Islam ;
    Dessouky, Samer
    2025-12-01 | ZIP
    Urban areas experience elevated pavement temperatures due to the urban heat island (UHI) effect, which increases cooling energy demand and associated carbon emissions. In this project, the work focused on three main components: (1) a comprehensive mechanical study of precast concrete mixes containing microencapsulated organic phase change material ...
    Dataset Supporting Files
  • Determining the Impact of CDOT Roadway Construction Projects on Air Quality
    Determining the Impact of CDOT Roadway Construction Projects on Air Quality
    Coffey, Evan ;
    Cortez, Gabriela
    2025-12-01 | PDF
    Elevated concentrations of air pollutants can have serious impacts on human health, the environment, and Colorado’s ecosystems. The Colorado Department of Transportation (CDOT) has prioritized protecting air quality in accordance with the Colorado Air Pollution Prevention and Control Act (Section 25-7-101 et seq., C.R.S., 2017). This research quant ...
  • Develop a Methodology for Pavement Drainage System Rating
    Develop a Methodology for Pavement Drainage System Rating
    Chen, Qiming ;
    Liu, Jun
    2025-12-01 | PDF
    Effective drainage is critical for preserving pavement integrity and extending service life, yet network-level methods for evaluating pavement drainage conditions remain limited. This study presents a practical methodology for assessing pavement drainage conditions using data from the Louisiana Department of Transportation and Development’s (DOTD) ...
  • Marketing and Education Budget for Implementation of New Transit Technology Guidebook
    Marketing and Education Budget for Implementation of New Transit Technology [Guidebook]
    Ketterl, Mona ;
    Dutta, Utpal
    2025-11-30 | PDF
    Michigan’s public transit agencies face increasing challenges in adopting new technologies due to limited funding, staffing constraints, and varying technical capacity. The purpose of this project was to identify practical strategies to support the planning, marketing, and implementation of new transit technologies across Michigan. The research met ...
  • Marketing and Education Budget for Implementation of New Transit Technology Report
    Marketing and Education Budget for Implementation of New Transit Technology [Report]
    Ketterl, Mona ;
    Dutta, Utpal
    2025-11-30 | PDF
    Michigan’s public transit agencies face increasing challenges in adopting new technologies due to limited funding, staffing constraints, and varying technical capacity. The purpose of this project was to identify practical strategies to support the planning, marketing, and implementation of new transit technologies across Michigan. The research met ...
  • Barrier Striping for the Reduction of Accidents Project Summary Report
    Barrier Striping for the Reduction of Accidents [Project Summary Report]
    Kutela, Boniphace ;
    Geedipally, Srinivas
    2025-11-30 | PDF
    The research team reviewed past practices for barrier delineation and evaluated barrier striping at several locations in Texas. Five existing sites with barrier striping were analyzed using crash data. In addition, striping was installed at a high-crash location for before-and-after evaluation. The study considered crash history, roadway and traffi ...
  • Comprehensive Study on the Behavior of Steel Girder Bridges
    Comprehensive Study on the Behavior of Steel Girder Bridges
    Masoudi, Mohammad Javad ;
    Song, Wei
    2025-11-30 | PDF
    This research investigates the impact of cross-frame detailing on the behavior of horizontally curved and skewed steel I-girder bridges. An analysis procedure based on three-dimensional (3D) finite element (FE) method is developed to accurately capture the complex behavior of steel girder bridges with various cross-frame detailing methods. By follo ...
  • Framework and Methodology for RiskBased Bridge and Tunnel Asset Management RiskBased Asset Ranking and Corridor Prioritization
    Framework and Methodology for Risk-Based Bridge and Tunnel Asset Management: Risk-Based Asset Ranking and Corridor Prioritization
    Yang, David Y. ;
    Khosravifar, Arash
    2025-11-10 | PDF
    This report presents the results of Phase II of the project, "Framework and Methodology for Risk-based Bridge and Tunnel Asset Management". The research was carried out at Portland State University in collaboration with engineers and officials at the Oregon Department of Transportation (ODOT) and Federal Highway Administration (FHWA). Using the fra ...
  • Review and Evaluation of Concrete Pavement Design Method in Alabama
    Review and Evaluation of Concrete Pavement Design Method in Alabama
    Wu, Shenghua ;
    Kang, Min-wook
    2025-11-07 | PDF
    Concrete pavements constitute only about 2% of Alabama’s highway system, yet they provide durable and low-maintenance performance capable of handling heavy traffic and environmental challenges. The Alabama Department of Transportation (ALDOT) currently utilizes the AASHTO 1993 design guide, which, while reliable, often produces conservative and ove ...
  • Enhancing ADOT Communications to Reduce Highway Litter in Arizona
    Enhancing ADOT Communications to Reduce Highway Litter in Arizona
    Washburn, Lauren C. ;
    O’Callaghan, Nicholas
    2025-11-04 | PDF
    This report summarizes a statewide study commissioned by the Arizona Department of Transportation (ADOT) to inform and enhance anti-litter communications and operational litter remediation practices as they pertain to the Arizona state highway system. The project team conducted communications research, developed a highway visible litter characteriz ...
  • Evaluating the Virginia Department of Transportations Potential Use of Electric Pickup Trucks Using Field Test Data supplemental file
    Evaluating the Virginia Department of Transportation’s Potential Use of Electric Pickup Trucks Using Field Test Data [supplemental file]
    Virginia Transportation Research Council (VTRC)
    2025-11-01 | XLSX
    This Excel Spreadsheet contains the Electric Vehicle Decision Support Tool: The life cycle cost analysis tool allows for a life cycle cost analysis comparison of multiple vehicles, including electric vehicles (EV), hybrid electric vehicles (HEV), and internal combustion engine vehicles (ICEV). The tool requires inputs about how the vehicle will be ...
    Supporting Files
  • Development of a Design Methodology for Geosynthetic Reinforced Pavement Using Finite Element Numerical Modeling
    Development of a Design Methodology for Geosynthetic Reinforced Pavement Using Finite Element Numerical Modeling
    Abu-Farsakh, Murad Y. ;
    Zadehmohamad, Mehdi
    2025-11-01 | PDF
    This study was completed using finite element (FE) analysis to assess the benefits of using geosynthetic reinforcement in flexible pavements. A comprehensive parametric study was performed to determine the effect of different variables like asphalt layer thickness, base thickness, geosynthetic type and stiffness, and subgrade stiffness for low, med ...
  • Alternatives to Motor Fuel Taxes for State DOT Funding
    Alternatives to Motor Fuel Taxes for State DOT Funding
    Dunn, Travis P ;
    Alvarado, Roberto
    2025-11-01 | PDF
    For decades, motor fuel taxes have served as the primary source of revenue for surface transportation infrastructure at both the federal and state levels in the United States. However, the reliability of this funding mechanism is challenged by declining fuel consumption, driven by advancements in vehicle engine efficiency and the growing consumer s ...
  • Structural Monitoring of Steel Member Bridge with Fatigue Life Prognosis Due to Dynamic Vehicular Loads
    Structural Monitoring of Steel Member Bridge with Fatigue Life Prognosis Due to Dynamic Vehicular Loads
    Wang, Yang ;
    Sherman, Ryan J.
    2025-11-01 | PDF
    A critical durability factor for steel bridges is the long-term fatigue performance, which depends on the structure’s fatigue details, stress range, and cycle counts. Modern bridges account for these factors and have an infinite service life; however, bridges designed using previous fatigue provisions may experience cracking. Given the importance o ...
  • Extending Full Depth Reclamation Service Lives
    Extending Full Depth Reclamation Service Lives
    Amarh, Eugene A. ;
    Tong, Bilin
    2025-11-01 | PDF
    The Virginia Department of Transportation (VDOT) has successfully used in-place recycling strategies on approximately 40 pavement rehabilitation projects in the state during the past decade. One such technique, full-depth reclamation (FDR), is usually selected as an alternative to conventional reconstruction to rehabilitate failing pavements where ...
  • Research Study to Inform StrutandTie Design and Guidance
    Research Study to Inform Strut-and-Tie Design and Guidance
    Tuchscherer, Robin G. ;
    Dymond, Benjamin Z.
    2025-11-01 | PDF
    The goal of the project summarized in this report was to research and develop criteria for updating and improving the ADOT Bridge Design Guidelines with respect to the strut-and-tie methodology defined in the AASHTO LRFD Bridge Design Specifications. To accomplish this goal, the existing literature was reviewed and bridge engineers in Arizona and a ...
  • Life History and Landscape Factors Influencing the Choice of Avoidance Minimization and Mitigation Measures Aimed at Reducing Impacts to the Rusty Patched Bumblebee Bombus affinis in Transportation Corridors
    Life History and Landscape Factors Influencing the Choice of Avoidance, Minimization, and Mitigation Measures Aimed at Reducing Impacts to the Rusty Patched Bumblebee (Bombus affinis) in Transportation Corridors
    Robinson, Jason L. ;
    Piltz, Moshe M.
    2025-11-01 | PDF
    The federally endangered rusty patched bumblebee (Bombus affinis) provides a difficult set of challenges for management and conservation. Bumblebee species have complex life histories, interacting with different obligatory habitat requirements across the ontogeny of the colony. Transportation corridors present unique opportunities for interventions ...
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