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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 41 - 60 of 36049 results
  • 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 ...
  • 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 ...
  • 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 ...
  • Roadway Runoff Impacts to Trout Streams Studies for MS4 Permit
    Roadway Runoff Impacts to Trout Streams Studies for MS4 Permit
    Fu, George Yuzhu ;
    Rowles, L. Stetson
    2026-02-01 | PDF
    This study evaluated roadway runoff impacts on trout stream temperature and dissolved oxygen to support GDOT MS4 Permit compliance with Georgia Rule 391-3-6-.03(6) for trout streams. Using YSI® ProDSS, HOBO® MX-801 Dataloggers, and low-cost ESP32-based sensors, the GSU research team collected summer season data over two (2) consecutive years at 2-3 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Development of Equipment Rental Schedule for Illinois
    Development of Equipment Rental Schedule for Illinois
    Bian, Zheyong ;
    Dong, Zhijie
    2026-01-01 | PDF
    During highway construction, the Illinois Department of Transportation (IDOT) resident engineer commonly adds “extra work” to the contract as needed for satisfactory completion of the project. One of the formats for contractor reimbursement requires establishing an hourly compensation rate for contractor-owned equipment used to perform the extra wo ...
  • AIA Recommendations for Ultrasound Inspection of New Make Turbine Engine LifeLimited Rotating Parts
    AIA Recommendations for Ultrasound Inspection of New- Make Turbine Engine, Life-Limited Rotating Parts
    Aerospace Industries Association of America  ...
    2026-01-01 | PDF
    The aero gas turbine industry has collaborated with the Federal Aviation Administration (FAA) to study and provide guidance regarding the inspection process for the subsurface volume of critical nickel-based engine hardware, through the Aerospace Industries Association (AIA) team AIA A-18-003. Data from across a broad spectrum in the industry is ne ...
  • An Analysis of VDOTs Sight Distance Requirements Relative to ContextSensitive Designs
    An Analysis of VDOT’s Sight Distance Requirements Relative to Context-Sensitive Designs
    Lamsal, Sharad ;
    McKinney, Jonathan
    2026-01-01 | PDF
    Intersection sight distance (ISD) requirements are intended to enhance safety by ensuring visibility at intersections. However, in dense urban areas, these requirements can preclude elements of the urban streetscape, such as street trees, on-street parking, and transit infrastructure, and can restrict compact mixed-use developments, such as traditi ...
  • Evaluation of Critical Shear Strength of Soils in Nebraska Based on Revised CPT
    Evaluation of Critical Shear Strength of Soils in Nebraska Based on Revised CPT
    Song, Chung R. ;
    Al-Nimri, Bashar
    2026-01-01 | PDF
    This study evaluated the “Fully Softened Shear Strength (FSSS)” of soils in Nebraska based on a revised Cone Penetration Test(CPT) method. FSSS is a unique strength condition that soils show substantially reduced strength during rainy seasons, eventually causing failure of slopes and other structures. The revised CPT was adapted to inject water at ...
  • Development and Evaluation of Crashworthy Approach Guardrail Transition with Increased Span Length Between Concrete Bridge Rail and First Transition Post Phase I
    Development and Evaluation of Crashworthy Approach Guardrail Transition with Increased Span Length Between Concrete Bridge Rail and First Transition Post – Phase I
    Yosef, Tewodros Y. ;
    Alomari, Qusai A.
    2026-01-01 | PDF
    This study developed and evaluated a 34-in.-tall Nebraska Department of Transportation (NDOT) thrie-beam approach guardrail transition (AGT) with an increased span between the concrete buttress end and the first transition post. The objective was to accommodate a wide range of common obstructions near bridge ends, including abutments, wing walls, d ...
  • The Use of Recycled Plastic in Asphalt Pavements Feasibility Study
    The Use of Recycled Plastic in Asphalt Pavements: Feasibility Study
    Bueno, Isabella M. ;
    Teixeira, Jamilla E. S. L.
    2026-01-01 | PDF
    The plastics industry has been actively exploring new end-market opportunities for the more than 35 million tons of waste plastics generated annually. The use of recycled WP in asphalt presents an opportunity to improve pavement performance while reducing the growing amount of WP being landfilled or released into the environment. However, the use o ...
  • 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 ...
  • 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 ...
  • MoDOT Work Zone Speed Study
    MoDOT Work Zone Speed Study
    Brown, Henry ;
    Edara, Praveen
    2026-01-01 | PDF
    Management of work zone speeds and ensuring driver compliance with work zone speed limits play an important role in reducing the number and severity of work zone crashes. The objective of this research study is to assess speeds driven by motorists in Missouri freeway work zones, including average speeds, 85th percentile speeds, maximum speeds, and ...
  • MoDOT Work Zone Speed Study Summary
    MoDOT Work Zone Speed Study [Summary]
    Brown, Henry ;
    Edara, Praveen
    2026-01-01 | PDF
    Management of work zone speeds and ensuring driver compliance with work zone speed limits play an important role in reducing the number and severity of work zone crashes. The objective of this research study is to assess speeds driven by motorists in Missouri freeway work zones, including average speeds, 85th percentile speeds, maximum speeds, and ...
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