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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 36336 results
  • 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 ...
  • 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 ...
  • 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 ...
  • Implementing the Safe System Approach for Speed Management in Utah
    Implementing the Safe System Approach for Speed Management in Utah
    Schultz, Grant G. ;
    Tripp, Kezia I.
    2026-02-01 | PDF
    Speed management is central to reducing fatal and serious injury crashes. The Safe System Approach, an emerging roadway safety paradigm in the United States, recognizes human error and vulnerability and focuses on minimizing crash severity through coordinated policy, design, and operational strategies. This research examines how Safe System Approac ...
  • 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 ...
  • 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 ...
  • A Comprehensive Guideline for GDOT Bridges Fire Hazard Assessment
    A Comprehensive Guideline for GDOT Bridges Fire Hazard Assessment
    Jonaidi, Mohammad ;
    Yee, Tien
    2026-02-01 | PDF
    Bridge fires can cause rapid and severe loss of structural capacity. This loss of capacity often leads to major safety risks, network disruptions, and high economic impacts. A curated history of U.S. bridge fires in the 20th and 21st centuries is presented. This history identifies recurring ignition sources, contributing factors, and damage pattern ...
  • 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 ...
  • Measurement of Cement Content and Layer Thickness Variation of CementStabilized Base and Subgrade Using Ground Penetrating Radar
    Measurement of Cement Content and Layer Thickness Variation of Cement-Stabilized Base and Subgrade Using Ground Penetrating Radar
    Kim, S. Sonny ;
    Birgisson, Bjorn
    2026-02-01 | PDF
    This report presents a comprehensive methodology for evaluating cement content and layer thickness variability in cement-stabilized pavement layers using a nondestructive ground penetrating radar (GPR) technique. The research integrates laboratory calibration and field validation for two widely used stabilization practices: conventional soil-cement ...
  • Use of Small UAVs for Field Measurement of Hydraulic Parameters in Small Drainage Basins
    Use of Small UAVs for Field Measurement of Hydraulic Parameters in Small Drainage Basins
    Do, Jitae ;
    Wang, Binbin
    2026-02-01 | PDF
    This project evaluated the feasibility, accuracy, and practical use of small unmanned aerial vehicles (UAVs) for measuring hydraulic parameters, water-surface elevation (WSE), surface velocity, bathymetry, and discharge, in small to medium Missouri drainage basins. UAV-based measurements offer non-contact alternative to traditional field methods in ...
  • Use of Small UAVs for Field Measurement of Hydraulic Parameters in Small Drainage Basins Summary
    Use of Small UAVs for Field Measurement of Hydraulic Parameters in Small Drainage Basins [Summary]
    Do, Jitae ;
    Wang, Binbin
    2026-02-01 | PDF
    This project evaluated the feasibility, accuracy, and practical use of small unmanned aerial vehicles (UAVs) for measuring hydraulic parameters, water-surface elevation (WSE), surface velocity, bathymetry, and discharge, in small to medium Missouri drainage basins. UAV-based measurements offer non-contact alternative to traditional field methods in ...
  • Project Consultant Support for IC and PMTP Projects in 20242025
    Project Consultant Support for IC and PMTP Projects in 2024-2025
    Chang, George K. ;
    Gilliland, Amanda
    2026-02-01 | PDF
    The 2024 MoDOT IC-PMTP Annual Report highlights achievements and challenges in implementing Intelligent Compaction (IC) and Paver-Mounted Thermal Profiling (PMTP) technologies. Key updates included aligning data validation tools with updated PMTP specifications and addressing challenges such as contractor’s paving boundary data manipulation and dat ...
  • Barrier Striping for the Reduction of Accidents
    Barrier Striping for the Reduction of Accidents
    Kutela, Boniphace ;
    Geedipally, Srinivas
    2026-02-01 | PDF
    Barrier striping is a roadway safety countermeasure designed to enhance driver awareness of concrete barriers, particularly under adverse weather and low-visibility conditions. This study evaluated the short- and long-term safety effectiveness of retroreflective barrier striping across multiple sites in Texas. The research involved a comprehensive ...
  • Best Practices for Pavement Widening
    Best Practices for Pavement Widening
    Wilson, Bryan ;
    Goehl, Darlene
    2026-02-01 | PDF
    Premature pavement failures have occurred on several widening projects, including shoulder widenings, conversion of two-lane roadways to Super 2 sections, and other safety enhancements. Repairing these early failures is time-consuming, expensive, disrupts traffic, and poses safety hazards. Key contributing factors include poor-quality materials, po ...
  • Characterization of Sediment Loads and Size Distribution in Nebraska Roadway Runoff
    Characterization of Sediment Loads and Size Distribution in Nebraska Roadway Runoff
    Dvorak, Bruce I. ;
    Admiraal, David M.
    2026-02-01 | PDF
    The Nebraska Department of Transportation (NDOT) must manage sediment, and pollutant loads from roadway runoff to meet stormwater regulations. The SAFL Baffle, a hydrodynamic separator used by NDOT, depends on reliable estimates of total suspended solids (TSS) and particle size distribution (PSD). However, limited data exists for Nebraska roadways. ...
  • The Impacts of Minimum Parking Requirements A Research Synthesis
    The Impacts of Minimum Parking Requirements: A Research Synthesis
    Schwartz, Ellen ;
    Manville, Michael
    2026-02-01 | PDF
    Across the United States and around the world, cities are increasingly reconsidering, and often repealing, minimum parking requirements. They are doing so to align their parking policy with their housing, climate, and mobility goals. While minimums can help increase parking availability and prevent curb parking from becoming overcrowded, they can a ...
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