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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 35909 results
  • How Does Transportation Insecurity Compare and Relate to Other Indicators of Material Hardship in the US
    How Does Transportation Insecurity Compare and Relate to Other Indicators of Material Hardship in the U.S.?
    Murphy, Alexandra K. ;
    Pilkauskas, Natasha V.
    2026-03-01 | PDF
    Increasingly, researchers have used measures of material hardship (food, housing, utility, bills, medical) to better understand economic distress. Missing from this literature are hardships related to transportation. This descriptive paper uses recent nationally representative data and a newly validated measure of transportation insecurity to addre ...
  • 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 ...
  • Development of Design Recommendations for Noncontact Hooked Bar Lap Splices for Large Reinforcing Bars
    Development of Design Recommendations for Noncontact Hooked Bar Lap Splices for Large Reinforcing Bars
    Coleman, Zachary W ;
    Brown, Mason
    2026-02-01 | PDF
    On wide bridges, precast concrete pier caps are often constructed in multiple segments and connected on site because of transportation or construction limitations. When these segments are connected through closure joints, contractors use lap splices of straight reinforcing bars. However, the splice lengths of large (e.g., No. 11) straight bars must ...
  • Special Crash Investigations OnSite HeavyTruck Underride Crash Investigation Vehicle 2017 International ProStar LF687 Truck Tractor Location California Crash Date December 2022
    Special Crash Investigations: On-Site Heavy-Truck Underride Crash Investigation; Vehicle: 2017 International ProStar LF687 Truck Tractor; Location: California; Crash Date: December 2022
    Dynamic Science, Inc.
    2026-02-01 | PDF
    This Special Crash Investigations report documents the remote investigation of a fatal heavy truck underride crash of a 2017 International ProStar LF687 truck tractor pulling a 2010 Hyundai trailer in California in December 2022. The crash occurred when the tractor-trailer was making a lefthand turn and was struck by a 2002 Ford Mustang with two ad ...
  • 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 ...
  • Safety Analysis of Highway Curves Where Crashes Occur in South Carolina Research Summary
    Safety Analysis of Highway Curves Where Crashes Occur in South Carolina [Research Summary]
    Sarasua, Wayne ;
    Murray-Tuite, Pamela
    2026-02-01 | PDF
    The design of highway curves has significant impact on traffic safety. More than 25% of fatal crashes in the United States occur on horizontal curves, and the crash rate for curves is approximately three times higher than other highway sections. This research focuses on a detailed analysis of curves where vehicle crashes occur in South Carolina. Ei ...
  • 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 Digital Alert Systems Associated With Emergency Response Vehicles and Compliance With Move Over Law
    Evaluation of Digital Alert Systems Associated With Emergency Response Vehicles and Compliance With Move Over Law
    Talebpour, Alireza ;
    Liu, Pengyuan
    2026-02-01 | PDF
    The presence of stationary emergency vehicles on high-speed roadways poses heightened safety risks, and driver compliance with Move Over laws remains inconsistent nationwide. In recent years, digital alert systems, integrated into widely used navigation applications and in-vehicle platforms, have emerged as a potential countermeasure to improve dri ...
  • Safety Analysis of Highway Curves Where Crashes Occur in South Carolina
    Safety Analysis of Highway Curves Where Crashes Occur in South Carolina
    Sarasua, Wayne ;
    Murray-Tuite, Pamela
    2026-02-01 | PDF
    The design of highway curves has significant impact on traffic safety. More than 25% of fatal crashes in the United States occur on horizontal curves, and the crash rate for curves is approximately three times higher than other highway sections. Furthermore, crashes are over 4 times more likely to be fatal on horizontal curve sections compared to s ...
  • 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 ...
  • 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 ...
  • Special Crash Investigations OnSite Ambulance Crash Investigation Vehicle 2014 Ford E350 Type II Ambulance Location Arkansas Crash Date January 2023
    Special Crash Investigations: On-Site Ambulance Crash Investigation; Vehicle: 2014 Ford E-350 Type II Ambulance; Location: Arkansas; Crash Date: January 2023
    Crash Research & Analysis, Inc
    2026-02-01 | PDF
    This Special Crash Investigations report documents the rollover crash of a 2014 Ford E-350 Type II ambulance that ran off the roadway, struck a road sign, a tree, and then rolled over. The unbelted 25-year-old female driver sustained fatal injuries. The unbelted 27-year-old male EMT/front passenger sustained serious injuries. The ambulance was trav ...
  • 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 ...
  • 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 ...
  • Special Crash Investigations OnSite Rollover Crash Investigation Vehicle 2018 Jeep Compass Location California Crash Date January 2022
    Special Crash Investigations: On-Site Rollover Crash Investigation; Vehicle: 2018 Jeep Compass; Location: California; Crash Date: January 2022
    Dynamic Science, Inc.
    2026-02-01 | PDF
    This Special Crash Investigations report documents the investigation of a two-vehicle crash and rollover in California in January 2022 of a stolen 2018 Jeep Compass driven by an unbelted 32-year-old male with a passenger, an unbelted 25-year-old female. The other vehicle was a 2019 Lexus ES300H driven by a belted 61-year-old male with a front right ...
  • Special Crash Investigations Remote Frontover Incident Investigation Vehicle 2022 Honda Civic Location California Incident Date March 2023
    Special Crash Investigations: Remote Frontover Incident Investigation; Vehicle: 2022 Honda Civic; Location: California; Incident Date: March 2023
    Dynamic Science, Inc.
    2026-02-01 | PDF
    This Special Crash Investigations report documents the remote investigation of a frontover incident in California in March 2023 that involved two pedestrians, a 62-year-old male and 60-year-old female, who were struck by a 2022 Honda Civic driven by an unlicensed, belted 18-year-old male. The Honda was stopped at a traffic signal in the right turn ...
  • 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 ...
  • Cold InPlace Recycle CIR and FullDepth Reclamation FDR in Arizona
    Cold In-Place Recycle (CIR) and Full-Depth Reclamation (FDR) in Arizona
    Mamlouk, Michael S. ;
    Aker, Saed
    2026-01-01 | PDF
    The primary goal of this study was to develop guidance materials for the Arizona Department of Transportation's (ADOT’s) consideration for the adoption and implementation of CIR and FDR technologies. The first objective in accomplishing this goal was to summarize the current state of the practice on the key engineering factors that could contribute ...
  • Developing a Pedestrian Safety Performance Function for Oregon
    Developing a Pedestrian Safety Performance Function for Oregon
    Roll, Josh ;
    Anderson, Jason
    2026-01-01 | PDF
    This report details the development of a pedestrian safety performance function (SPF) for intersections in urban areas in the state of Oregon. The report documents the process to develop SPFs for pedestrian crashes including the process to develop the data for analysis. A key innovation of this work is the use of pedestrian traffic volume estimates ...
  • 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 ...
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