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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 161 - 180 of 36336 results
  • Kansas Department of Transportation 2025 Passing Lane Guidance Technical Summary
    Kansas Department of Transportation 2025 Passing Lane Guidance [Technical Summary]
    Fitzsimmons, Eric J. ;
    Harwood, Douglas
    2025-12-01 | PDF
    This report provides comprehensive guidance for planning, locating, designing, and evaluating passing lanes on Kansas rural two-lane highways. It describes the role of passing in improving mobility by reducing platooning, lowering percent time spent following, and increasing travel speeds. Multiple passing lane configurations are outlined, with gui ...
  • Standardizing Rigid Inclusions for Transportation ProjectsPhase I Technical Summary
    Standardizing Rigid Inclusions for Transportation Projects—Phase I [Technical Summary]
    Han, Jie ;
    Lamsal, Sameep
    2025-12-01 | PDF
    Evaluation of the design methods involved a comparison of results calculated from the popular design methods BS 8006-1, EBGEO, CUR226, and the Federal Highway Administration (FHWA) for three key design parameters (load efficacy, differential settlement and reinforcement strain). The measured data were available in the literature, including 24 full- ...
  • Standardizing Rigid Inclusions for Transportation Projects Phase I
    Standardizing Rigid Inclusions for Transportation Projects — Phase I
    Han, Jie ;
    Lamsal, Sameep
    2025-12-01 | PDF
    Rigid inclusions (RIs) have increasingly been used in ground improvement technology in the United States because they effectively reduce settlement, increase bearing capacity, and enhance stability. Several design methods have been developed to analyze RI-supported embankments based on various assumptions for transportation applications. This study ...
  • Traffic Control Device Analysis Testing and Evaluation Program FY 2025 Activities
    Traffic Control Device Analysis, Testing, and Evaluation Program: FY 2025 Activities
    Finley, Melisa D. ;
    Lopez, Nicholas
    2025-12-01 | PDF
    Traffic control devices are a primary means of communicating highway information to road users and play a key role in highway automation. The design, application, and maintenance of traffic control devices are under constant transformation as new technologies, methodologies, and policies are introduced. In addition, vehicle technologies and the roa ...
  • Kansas Department of Transportation 2025 Passing Lane Guidance
    Kansas Department of Transportation 2025 Passing Lane Guidance
    Fitzsimmons, Eric J. ;
    Harwood, Douglas
    2025-12-01 | PDF
    This report provides comprehensive guidance for planning, locating, designing, and evaluating passing lanes on Kansas rural two-lane highways. It describes the role of passing in improving mobility by reducing platooning, lowering percent time spent following, and increasing travel speeds. Multiple passing lane configurations are outlined, with gui ...
  • A Path Forward for Transit Rider Experience and Safety Lessons from the LA Metro Ambassador Pilot Program
    A Path Forward for Transit Rider Experience and Safety: Lessons from the LA Metro Ambassador Pilot Program
    Wasserman, Jacob L. ;
    Brozen, Madeline
    2025-12-01 | PDF
    A growing number of U.S. transit agencies are adding transit ambassadors to their systems to improve the customer service and safety experience for passengers. These personnel can play a variety of different roles, including providing wayfinding, system navigation, fare payment support, and other passenger support roles that enhance the customer ex ...
  • Machine Vision Approach to Retroreflectivity Measurements
    Machine Vision Approach to Retroreflectivity Measurements
    Raj, Sumit ;
    Senske, Nickolas
    2025-12-01 | PDF
    This report presents a complete evaluation of the machine-vision-based dynamic retroreflectometer system (DRS) with a 30-m geometry scaled to 12-m, manufactured by Reflective Measurement Systems Ltd, 100% owners of RetroTekUSA. The assessment includes pavement marking evaluation, including line striping retroreflectivity, line striping width, color ...
  • A Computational Tool for the Reliable Prediction of Pavement Performance based on Temperature Data
    A Computational Tool for the Reliable Prediction of Pavement Performance based on Temperature Data
    dos Santos, Ketson ;
    Marasteanu, Mihai O.
    2025-12-01 | PDF
    This study presents a computational tool for predicting pavement performance using long-term temperature data from thermocouple trees embedded in three flexible and two rigid pavement sections at the MnROAD facility. The research leverages spectral and probabilistic analyses to assess thermal behavior and its impact on pavement condition. Temperatu ...
  • Bismarck Mandan Regional ITS Architecture Update Version 50
    Bismarck- Mandan Regional ITS Architecture Update [Version 5.0]
    Hasan, Sharijad
    2025-12-01 | PDF
    The Bismarck-Mandan Regional Intelligent Transportation Systems (ITS) Architecture was developed under the guidance of the Bismarck-Mandan Metropolitan Planning Organization (Bis-Man MPO). Initially created in 2005, this architecture has undergone four updates in 2008, 2013, 2021, and 2025. Its primary purpose is to guide the implementation of ITS ...
  • Investigation of Dolomite Aggregate LongTerm Cementation and Its Potential Advantage for Building Roads
    Investigation of Dolomite Aggregate Long-Term Cementation and Its Potential Advantage for Building Roads
    Kong, Taeyun ;
    Kothari, Chirayu
    2025-12-01 | PDF
    This study investigated the mechanical strength and freeze-thaw durability of carbonate-based aggregate quarry by-products (QBs) stabilized with cement alone and in combination with calcined clay (metakaolin, MK) for potential use in pavement foundation layers. The primary objective was to evaluate the chemical and physical characteristics of dolom ...
  • Special Crash Investigations OnSite Rollover System Crash Investigation Vehicle 2019 Subaru Outback Limited Location North Carolina Crash Date November 2022
    Special Crash Investigations: On-Site Rollover System Crash Investigation; Vehicle: 2019 Subaru Outback Limited; Location: North Carolina; Crash Date: November 2022
    Crash Research & Analysis, Inc
    2025-12-01 | PDF
    This Special Crash Investigations report documents the on-site investigation of the rollover crash of a 2019 Subaru Outback Limited in North Carolina in November 2022 driven by a belted 34-year-old female with a belted 70-year-old female front passenger. The Subaru crossed into the oncoming lane, traveling more than half a mile before veering off t ...
  • Special Crash Investigations OnSite Rollover Crash Investigation Vehicle 2019 Chevrolet Equinox Location California Crash Date October 2022
    Special Crash Investigations: On-Site Rollover Crash Investigation; Vehicle: 2019 Chevrolet Equinox; Location: California; Crash Date: October 2022
    Dynamic Science, Inc.
    2025-12-01 | PDF
    This Special Crash Investigations report documents the fatal rollover crash of a 2019 Chevrolet Equinox that moved into the lane of a 2016 Honda CR-V. The Chevrolet went out of control, rolled down a dirt embankment and rolled over. The Chevrolet driver was pronounced deceased on-scene, and the belted 52-year-old front passenger was hospitalized fo ...
  • Reliability of Nondestructive Evaluation of Concrete Bridge Decks
    Reliability of Nondestructive Evaluation of Concrete Bridge Decks
    Balakumaran, Soundar S G ;
    Behravan, Amir
    2025-12-01 | PDF
    Although visual inspections remain the primary method for bridge deck evaluation, they fail to detect hidden deterioration. Rapid-scanning nondestructive evaluation (NDE) techniques are gaining popularity, but their reliability compared with traditional methods is unclear. This study aimed to determine the reliability of multiple NDE methods for de ...
  • Reducing Costs in Full Depth Reclamation
    Reducing Costs in Full Depth Reclamation
    Kim, Jinho ;
    Sebesta, Stephen
    2025-12-01 | PDF
    Full depth reclamation (FDR) using emulsified asphalt or foamed asphalt continues to grow in usage throughout Texas. These mixtures typically use a cement additive in the mix design. The cement additive reportedly contributes to early strength gain, which can be particularly important for projects that require daily opening to heavy traffic. Howeve ...
  • CenDak Signalized Intersections Traffic Data Collection 2025
    CenDak Signalized Intersections Traffic Data Collection – 2025
    Sharma, Kshitij
    2025-12-01 | PDF
    This project spanning the year 2025 set up 17 additional City intersections, raising the total locations reporting data to 19. Note that similar to the NDDOT sponsored pilot project, this phase of traffic data collection and reporting used existing infrastructure without the need to purchase or maintain any additional traffic data collection device ...
  • New NearFault Adjustment Factors for Caltrans Seismic Design Criteria SDC
    New Near-Fault Adjustment Factors for Caltrans Seismic Design Criteria (SDC)
    Mazzoni, Silvia ;
    Zengin, Ersa
    2025-12-01 | PDF
    This report covers analyses of Caltrans’ near-fault adjustment factors as recommended in the Caltrans Seismic Design Criteria. The report has two large chapters. Chapter 1 builds on prior the University of California Los Angeles studies that performed probabilistic seismic hazard analyses at numerous California sites across a range of return period ...
  • Thermally Conductive Pre-cast Concrete Pavement for Urban Heat Island Mitigation [supporting dataset]
    Radwan, Islam ;
    Dessouky, Samer
    2025-12-01 | ZIP
    Urban areas experience elevated pavement temperatures due to the urban heat island (UHI) effect, which increases cooling energy demand and associated carbon emissions. In this project, the work focused on three main components: (1) a comprehensive mechanical study of precast concrete mixes containing microencapsulated organic phase change material ...
    Dataset Supporting Files
  • Determining the Impact of CDOT Roadway Construction Projects on Air Quality
    Determining the Impact of CDOT Roadway Construction Projects on Air Quality
    Coffey, Evan ;
    Cortez, Gabriela
    2025-12-01 | PDF
    Elevated concentrations of air pollutants can have serious impacts on human health, the environment, and Colorado’s ecosystems. The Colorado Department of Transportation (CDOT) has prioritized protecting air quality in accordance with the Colorado Air Pollution Prevention and Control Act (Section 25-7-101 et seq., C.R.S., 2017). This research quant ...
  • Develop a Methodology for Pavement Drainage System Rating
    Develop a Methodology for Pavement Drainage System Rating
    Chen, Qiming ;
    Liu, Jun
    2025-12-01 | PDF
    Effective drainage is critical for preserving pavement integrity and extending service life, yet network-level methods for evaluating pavement drainage conditions remain limited. This study presents a practical methodology for assessing pavement drainage conditions using data from the Louisiana Department of Transportation and Development’s (DOTD) ...
  • Effect of Fines on Liquefaction Triggering Analyses
    Effect of Fines on Liquefaction Triggering Analyses
    Renugah, Varun N. S. ;
    Sahin, Arda
    2025-12-01 | PDF
    This report presents a new framework for applying fines content corrections in soil liquefaction evaluations. Fines content affects both penetration resistance and cyclic resistance, but current methods use a single correction to represent both effects. This study separates these influences by using variable-rate CPT data to assess the effect of fi ...
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