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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 1 - 20 of 35811 results
  • AlkaliSilica Reaction ASR Mitigation in HighAlkali Content Cements
    Alkali-Silica Reaction (ASR) Mitigation in High-Alkali Content Cements
    Behravan, Amir ;
    Arce, Gabriel A
    2026-02-01 | PDF
    This study presents a comprehensive evaluation of alkali-silica reaction (ASR) in concrete mixtures, focusing on the performance-based specifications and the critical role of supplementary cementitious materials (SCMs) in mitigation. A modified version of American Association of State Highway and Transportation Officials (AASHTO) T380 was developed ...
  • Linking Oregon Driver Records and Crash Data to Evaluate Interventions and Mitigate Driver Risk
    Linking Oregon Driver Records and Crash Data to Evaluate Interventions and Mitigate Driver Risk
    Hurwitz, David ;
    Jashami, Hisham
    2026-02-01 | PDF
    ODOT seeks to reduce the number of risky drivers on the road through driver improvement programs, but the efficacy of these programs are rarely assessed. This report details the methodology for creating a linked database combining driver, verdict, accident, and crash data from ODOT to evaluate program performance and trends in risky driver behavior ...
  • Validation of HSM Crash Prediction Methods for Specific Intersection Types in Oregon
    Validation of HSM Crash Prediction Methods for Specific Intersection Types in Oregon
    Geedipally, Srinivas R. ;
    Dixon, Karen K.
    2026-02-01 | PDF
    The Highway Safety Manual (“HSM”) is the national guidance of quantitative safety analysis used in highway transportation planning, alternatives development, highway design, operations, and maintenance. However, some safety prediction models in the HSM were developed using data from other states, not Oregon. Therefore, it is necessary to validate t ...
  • North Lombard Street Multimodal Safety Project BeforeAfter Evaluation
    North Lombard Street Multimodal Safety Project Before-After Evaluation
    Kothuri, Sirisha ;
    Anderson, Jason C.
    2026-02-01 | PDF
    This report analyzes and summarizes the changes in conflicts, user volumes, speed, travel time, and vehicle throughput before and after a multimodal safety project on N Lombard St. Results show that changes in each metric were observed in the before and after conditions. The number of persons using crosswalks decreased between 2017 and 2019 and inc ...
  • Spatial and Temporal Load Distribution in Steel Bridge Superstructures Vol I Agency Survey and Preliminary Numerical Modeling of Skewed Steel IGirder Bridges for Field Instrumentation
    Spatial and Temporal Load Distribution in Steel Bridge Superstructures (Vol. I): Agency Survey and Preliminary Numerical Modeling of Skewed Steel I-Girder Bridges for Field Instrumentation
    Zhou, Siang ;
    Dorado, Ricardo
    2026-02-01 | PDF
    Highly skewed steel I-girder bridges are used commonly across the US, especially in congested areas, despite complications in their analysis, design, and construction. Systematic investigation of skewed steel I-girder superstructure response, load distribution, and deformation through field monitoring and numerical simulation is needed, including a ...
  • Quantifying Sustainable Pavements in VirginiaFHWA Climate Challenge Study
    Quantifying Sustainable Pavements in Virginia—FHWA Climate Challenge Study
    Amarh, Eugene A. ;
    Katicha, Samer W.
    2026-02-01 | PDF
    This study supports Virginia’s efforts to participate in the Federal Highway Administration’s Climate Challenge Program. The research team developed and applied OpenLCA models to evaluate the effects of key pavement treatments, including asphalt overlays, balanced mix designs, cold in-place recycling, full-depth reclamation, and Portland cement con ...
  • No Such Thing as Free Parking Construction Costs in 17 US Cities
    No Such Thing as Free Parking: Construction Costs in 17 U.S. Cities
    Schwartz, Ellen
    2026-02-01 | PDF
    Across the United States, city zoning rules require a minimum number of parking spaces for every type of building, obligating anyone building new housing or commercial space to also expand the city’s parking supply. Researchers have frequently argued that these mandates are arbitrary, unscientific and one-size-fits-all, and that they work against m ...
  • Evaluation of Rolled Erosion Control Products and Seed Mixes for Vegetation Establishment on Slopes
    Evaluation of Rolled Erosion Control Products and Seed Mixes for Vegetation Establishment on Slopes
    Donaldson, Bridget M. ;
    Rossetti, Maria S.
    2026-01-01 | PDF
    Because transportation construction projects often result in steep slopes with disturbed, bare soils that are sensitive to runoff and erosion processes, vegetation establishment is a continual challenge for transportation departments. The Virginia Department of Transportation (VDOT) regularly uses rolled erosion control products (RECPs) to mitigate ...
  • Effectiveness of Automated Speed Enforcement in School Zones and Guidance for Continuous Usage in Georgia
    Effectiveness of Automated Speed Enforcement in School Zones and Guidance for Continuous Usage in Georgia
    Dissanayake, Sunanda ;
    Bhavsar, Parth
    2026-01-01 | PDF
    One of the growing concerns for transportation agencies is speed management in school zones, as it is vital to children's safety. Automated Speed Enforcement (ASE) is one of the measures to address speed management concerns. As of January 2024, approximately 286 schools across Georgia were equipped with ASE cameras, aiming to improve traffic safety ...
  • Investigate the Impact of Rumble Strip on Motorcyclists
    Investigate the Impact of Rumble Strip on Motorcyclists
    Tsai, Yichang (James) ;
    Cabe, Reid
    2026-01-01 | PDF
    This research project evaluates how rumble strip design and placement affect motorcycle safety and comfort, with the goal of developing recommendations for the Georgia Department of Transportation (GDOT) to improve roadway design practices. Rumble strips are a proven countermeasure for roadway departure crashes; however, their vibration and geometr ...
  • Emergency Management Strategies for Electric Vehicles
    Emergency Management Strategies for Electric Vehicles
    Goodall, Noah J.
    2026-01-01 | PDF
    Electric vehicle fires present unique challenges for roadway incident management due to lithium-ion battery thermal runaway characteristics that can result in extended suppression durations, toxic emissions, and reignition risks. This study assessed the prevalence and operational impacts of electric vehicle fires through analysis of vehicle fire in ...
  • Computational Fluid Dynamics Investigation of High Mast Illumination Poles Influence of Light Fixtures
    Computational Fluid Dynamics Investigation of High Mast Illumination Poles: Influence of Light Fixtures
    Junge, Briceson ;
    Bennett, Caroline
    2026-01-01 | PDF
    High Mast Illumination Poles (HMIPs) are lighting towers that are taller than 55 ft (16.8 m) and are typically located along highways and rest stops. In March 2019, a wind event, referred to as a “bomb cyclone,” caused several HMIPs in Kansas to excite and experience large-amplitude deflections on the order of several feet called “lock-in” behavior ...
  • Partnering With Transportation Network Companies to Serve LowDensity Communities
    Partnering With Transportation Network Companies to Serve Low-Density Communities
    Darling, Wesley ;
    Cassidy, Michael J.
    2026-01-01 | PDF
    This study addresses the persistent challenge of delivering cost-effective, high-quality on-demand transit in low-density communities. Traditional microtransit services often struggle in such areas due to high fixed costs and limited opportunities to consolidate trips, while community partnerships with transportation network companies (TNCs) like U ...
  • Developing Sight Distance Guidelines for UTurn Maneuvers
    Developing Sight Distance Guidelines for U-Turn Maneuvers
    Tsai, Yichang (James) ;
    Agnihotri, Atharv
    2026-01-01 | PDF
    This project, conducted by the Georgia Tech research team in collaboration with the Georgia Department of Transportation (GDOT), aims to develop safe and practical U-turn sight distance (UTSD) guidelines for Reduced Conflict U-turn (RCUT) intersections. The research analyzed video footage from GDOT to quantify U-turn maneuver times under varying me ...
  • Virginias 2024 Implementation of Balanced Mix Design
    Virginia’s 2024 Implementation of Balanced Mix Design
    Diefenderfer, Stacey D. ;
    Smith, Bryan C.
    2026-01-01 | PDF
    The Virginia Department of Transportation (VDOT) implemented balanced mix design (BMD) performance testing for asphalt mixture design and production in the 2024 paving season. The BMD approach seeks to achieve asphalt mixtures that have properties to resist both cracking and rutting distresses and to increase durability. This implementation of BMD ...
  • Artificial Intelligence and Its Role and Use Within State DOTs
    Artificial Intelligence and Its Role and Use Within State DOTs
    Egge, Mark ;
    Tate, Syndney
    2026-01-01 | PDF
    Artificial Intelligence (AI) is increasingly shaping the way state Departments of Transportation (DOTs) approach both research and daily operations. This powerful technology creates new opportunities for improving efficiency, supporting decision-making, and streamlining agency workflows, but it also presents new challenges, including concerns about ...
  • Develop a RealTime Decision Support Tool for Urban Roadway Safety Improvements
    Develop a Real-Time Decision Support Tool for Urban Roadway Safety Improvements
    Das, Subasish ;
    Liu, Jinli
    2026-01-01 | PDF
    Speed-related crashes remain a critical concern for Texas, identified as one of the seven key emphasis areas in the Texas Strategic Highway Safety Plan (SHSP) for 2018–2022. Traditional crash risk models often overlook essential real-time factors such as operating speed, traffic variability, and weather, limiting their effectiveness. To address thi ...
  • Quantifying Maritime Chokepoint Disruptions Using AIS Data A PostEvent Impact Measurement Framework for Networked Transportation Systems
    Quantifying Maritime Chokepoint Disruptions Using AIS Data: A Post-Event Impact Measurement Framework for Networked Transportation Systems
    Im, Yunseop
    2026-01-01 | PDF
    This document records an analytical review of a post-event measurement approach applied to major maritime chokepoint disruptions using AIS vessel presence data. The purpose of the work is limited in scope. It is intended to support after-action assessment and comparison of disruption effects once abnormal operating conditions have already materiali ...
  • Development of Adjustment Factors and Load Ratings via Statistical Analyses of the National Bridge Inventory Database
    Development of Adjustment Factors and Load Ratings via Statistical Analyses of the National Bridge Inventory Database
    McVey, Isaac ;
    Husic, Admin
    2026-01-01 | PDF
    This study developed a new approach to establish baseline load ratings for bridges in Kansas without plans using data from the National Bridge Inventory (NBI). The approach is comprised of linear regression models to estimate load ratings for bridges with a condition rating of 8 or higher and adjustment factors to lower the estimated load rating to ...
  • Development of Adjustment Factors and Load Ratings via Statistical Analyses of the National Bridge Inventory Database Technical Summary
    Development of Adjustment Factors and Load Ratings via Statistical Analyses of the National Bridge Inventory Database [Technical Summary]
    McVey, Isaac ;
    Husic, Admin
    2026-01-01 | PDF
    The primary objective of this study was to develop and evaluate a statistical model using the National Bridge Inventory (NBI) database to establish baseline load ratings for bridges in Kansas. A linear regression model was used to identify key variables, such as age and bridge condition, that correlate with recorded inventory and operating load rat ...
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