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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 21 - 40 of 36049 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 ...
  • Analysis of the Potential Revenue and Equity Impacts of an ECommerce Household Delivery Fee in Oregon
    Analysis of the Potential Revenue and Equity Impacts of an E-Commerce Household Delivery Fee in Oregon
    Figliozzi, Miguel
    ORCID ICON IMG
    2026-03-01 | PDF
    The research goal of this project is to better understand the potential implications of a household e-commerce delivery fee. A survey was developed to study the factors that impact potential revenue and its equity implications.
  • Signal Controller in the Loop Simulation
    Signal Controller in the Loop Simulation
    Hurwitz, David ;
    Jashami, Hisham
    2026-03-01 | PDF
    A novel Hardware-in-the-loop Simulation tool was constructed to show how modifications to signal timings would improve coordinated corridor performance. A total of 15 unique microsimulation models were developed and run three times each to test three case studies of bi-direction bandwidth optimization, cycle length sensitivity, and leading pedestri ...
  • Enhancement of AASHTOWare Bridge Management for Floridas Bridge Inspection and Asset Management Summary
    Enhancement of AASHTOWare Bridge Management for Florida’s Bridge Inspection and Asset Management [Summary]
    Padilla, Felix ;
    Sobanjo, John O.
    2026-03-01 | PDF
    The primary objective of the research was to help FDOT successfully implement and optimize the AASHTOWare BrM software by recalibrating its essential analytical models—such as deterioration, risk, cost, and data translation tools—so the software can more accurately forecast bridge performance, support decision-making, and satisfy federal requiremen ...
  • NEXTGEN Concrete Tests of the Future Chloride and Sulfate Durability Summary
    NEXTGEN Concrete – Tests of the Future: Chloride and Sulfate Durability [Summary]
    Su, Dan ;
    Simmons, Ronald
    2026-03-01 | PDF
    The objective of this project was to determine appropriate screening thresholds for tests that assess concrete durability in extremely aggressive chloride and sulfate environments. Specifically, the research aimed to recommend threshold values for bulk and surface resistivity tests (based on AASHTO TP 119 and T 358) for chloride durability, and for ...
  • Freeway and Arterial Performance Analysis With HighResolution Vehicle Trajectory Data
    Freeway and Arterial Performance Analysis With High-Resolution Vehicle Trajectory Data
    Tian, Zong ;
    Wang, Aobo
    2026-02-28 | PDF
    This research investigates applying high-resolution vehicle trajectory data, derived from vehicle telematics, to facilitate freeway and arterial performance analysis in Nevada. Leveraging vehicle trajectory datasets crowd sourced through original equipment manufacturer (OEM) telematics, the research team conducted a comprehensive synthesis of commo ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
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