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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 201 - 220 of 35440 results
  • Development of a Moisture Sensitivity Test for Asphalt Mixtures
    Development of a Moisture Sensitivity Test for Asphalt Mixtures
    Mohammad, Louay N. ;
    Akentuna, Moses
    2025-06-01 | PDF
    Moisture-induced damage in asphalt pavements poses a significant concern for road agencies, affecting both long-term performance and driving safety. Most road agencies have relied on the Modified Lottman (ML) test, following the AASHTO T 283 standard, to assess the moisture susceptibility of asphalt mixtures. However, researchers have questioned th ...
  • Pedestrian Safety and Traffic Operations Near Transit Stops 2025
    Pedestrian Safety and Traffic Operations Near Transit Stops [2025]
    Singleton, Patrick A. ;
    Paskett, Aleks
    2025-06-01 | PDF
    This research project’s objective was to investigate the impacts of transit stop location (near-side versus far-side) on pedestrian safety and traffic operations at intersections. Three different video-based behavioral observation data collections at signals in Utah were utilized and studied: (1) transit stop events (interactions between transit ve ...
  • Planning for Encounters with Special Management Areas Characterization Management Approaches and Syntheses
    Planning for Encounters with Special Management Areas: Characterization, Management Approaches, and Syntheses
    Smith, Elliott T ;
    Zinnen, Jack H
    2025-06-01 | PDF
    The Illinois Department of Transportation (IDOT) manages land with considerable conservation value. Some IDOT roadways contain, or are near, special management areas (SMAs): places that have legal protection, are habitat for species with legal protection, or contain valuable biodiversity. Although SMAs are important for IDOT’s environmental objecti ...
  • Audible Alert and TMA Lighting Research Summary
    Audible Alert and TMA Lighting [Research Summary]
    Adu-Gyamfi, Yaw
    ORCID ICON IMG
    2025-06-01 | PDF
    Truck Mounted Attenuators (TMAs) are designed to mitigate crash severity. Currently, TMA drivers rely on visual checks via driving mirrors to manually trigger warnings thus placing the duty on drivers. To address this limitation, the Automated TMA Warning System (AutoTMA) replaces or augments manual driver interventions with an AI-enabled, sensor-f ...
  • Shear Wave Velocity Measurements Final Report Appendices
    Shear Wave Velocity Measurements [Final Report, Appendices]
    Torgashov, Evgeniy V. ;
    Anderson, Neil
    2025-06-01 | PDF
    The Missouri Department of Transportation (MoDOT) commissioned SCI Engineering, Inc. to investigate cost-effective, non-intrusive geophysical methods for determining time-averaged shear wave velocity (Vs) profiles to a depth of 100 feet, based on anticipated updates to AASHTO seismic site classification specifications. Following a comprehensive lit ...
    Supporting Files
  • Audible Alert and TMA Lighting
    Audible Alert and TMA Lighting
    Adu-Gyamfi, Yaw ;
    Sun, Carlos
    2025-06-01 | PDF
    Truck Mounted Attenuators (TMAs) are designed to mitigate crash severity. Currently, TMA drivers rely on visual checks via driving mirrors to manually trigger warnings thus placing the duty on drivers. To address this limitation, the Automated TMA Warning System (AutoTMA) replaces or augments manual driver interventions with an AI-enabled, sensor-f ...
  • Testing Survey Methods for Detecting Bats Roosting in Bridges
    Testing Survey Methods for Detecting Bats Roosting in Bridges
    Roby, Piper ;
    Birdsall, Crystal
    2025-06-01 | PDF
    Bats are a critical component of our natural world, and many species are at risk. Protecting roosting habitat is one way we can help conserve a variety of species. Although many bats use natural roosts, a growing number are adapting to anthropogenic structures due to habitat encroachment. In this study, we tested methods for detecting bats using br ...
  • Development of a Moisture Sensitivity Test for Asphalt Mixtures Technical Summary
    Development of a Moisture Sensitivity Test for Asphalt Mixtures [Technical Summary]
    Mohammad, Louay N.
    2025-06-01 | PDF
    Moisture-induced damage in asphalt pavements poses a significant concern for road agencies, affecting both long-term performance and driving safety. Most road agencies have relied on the Modified Lottman (ML) test, following the AASHTO T 283 standard, to assess the moisture susceptibility of asphalt mixtures. However, researchers have questioned th ...
  • Effect of SARA Asphalt Binder Fractionations on Laboratory Performance of Asphalt Mixtures Project Capsule
    Effect of SARA Asphalt Binder Fractionations on Laboratory Performance of Asphalt Mixtures [Project Capsule]
    Mohammaed, Louay ;
    Akentuna, Moses
    2025-06-01 | PDF
    The objective of this study is to evaluate the influence of asphalt binders possessing the same Performance Grade (PG) but differing in chemical composition as characterized by SARA fraction percentages on the mechanical performance of asphalt mixtures across high, intermediate, and low temperatures. Two sets of laboratory experiments will be condu ...
  • Groundwater Flooding on Highways in the Nebraska Sandhills Applying Remote Sensing Precipitation and Groundwater Modeling to Determine Depth Cause and Frequency
    Groundwater Flooding on Highways in the Nebraska Sandhills: Applying Remote Sensing, Precipitation and Groundwater Modeling to Determine Depth, Cause and Frequency
    Mittelstet, Aaron
    2025-06-01 | PDF
    Climate change significantly impacts infrastructure sustainability, particularly through shifts in precipitation patterns, intensity, and duration. These precipitation dynamics may increase the occurrence of surface water and groundwater flooding. Groundwater in the Nebraska Sand Hills (NSH), including the thickest portions of the High Plains Aquif ...
  • NMDOT Pedestrian Outreach Program
    NMDOT Pedestrian Outreach Program
    Ferenchak, Nicholas N. ;
    Lucaci, Ana M
    2025-06-01 | PDF
    This research report reviews best practices in pedestrian outreach and engagement from various state, regional, and city agencies that will guide pedestrian outreach for the New Mexico Department of Transportation (NMDOT) Pedestrian Safety Action Plan (PSAP). This report summarizes insights from interviews with government personnel overseeing pedes ...
  • Assessing a New Tool for Early Detection of Endangered Turtles on Proposed Transportation Projects
    Assessing a New Tool for Early Detection of Endangered Turtles on Proposed Transportation Projects
    Davis, Mark ;
    Costantini, Maria
    2025-06-01 | PDF
    As turtle populations decline worldwide, there is an increased need for rapid and reliable monitoring of species to meet the need of increased regulatory burdens. The use of environmental DNA (eDNA) as a monitoring tool for rare species is becoming increasingly common, but there is a still a need to optimize methods in the laboratory and the field ...
  • Analysis of School Bus StopArm Violation Reporting and Enforcement in Minnesota Lessons Learned and Opportunities for Process Improvements
    Analysis of School Bus Stop-Arm Violation Reporting and Enforcement in Minnesota: Lessons Learned and Opportunities for Process Improvements
    Morris, Nichole L. ;
    Kessler, William
    2025-06-01 | PDF
    School bus stop-arm violations represent a direct and serious safety risk to children boarding and exiting school buses. Mitigating these dangerous events with preventative measures, education, and proactive enforcement requires a deep understanding of these events. The goal of this study is to better understand the school bus stop-arm violation re ...
  • Understanding Risks and Opportunities for Ramp Metering Control in a MixedAutonomy Future
    Understanding Risks and Opportunities for Ramp Metering Control in a Mixed-Autonomy Future
    Stern, Raphael ;
    Zare, Arian
    2025-06-01 | PDF
    Vehicle automation may change traffic flow dynamics. This will also impact the control of traffic flow via infrastructure-based systems such as ramp metering control. In this work the authors investigated the impact that different levels of automation and connectivity will have on ramp metering control, and proposed modifications to existing ramp m ...
  • Beyond Copenhagen Walking and Cycling Success Stories from Cities Worldwide
    Beyond Copenhagen: Walking and Cycling Success Stories from Cities Worldwide
    Millard-Ball, Adam ;
    Reginald, Monisha
    2025-06-01 | PDF
    The potential for walking and cycling and related modes such as wheelchairs which we call “active transportation” throughout this playbook—to take center stage is demonstrated in cities worldwide. Amsterdam and Copenhagen are known to tourists and urban planners worldwide for their bicycle infrastructure. Throngs of pedestrians are a hallmark of po ...
  • Improving Testing Requirements in Item 300 of TxDOT Standard Specification
    Improving Testing Requirements in Item 300 of TxDOT Standard Specification
    Wei, Ziyao ;
    Komaragiri, Satyavati
    2025-06-01 | PDF
    Current test procedures in TxDOT specification Item 300, “Asphalts, Oils, and Emulsions” were reviewed for relevance, applicability, accuracy, and practicality, and recommendations were made for improving the tests and specifications. New test procedures were developed, as identified, to fulfill needed changes. Data for new proposed test procedures ...
  • Development of Operations Management System for Iowa Secondary Road Departments
    Development of Operations Management System for Iowa Secondary Road Departments
    Moore, Brian P ;
    Gray, Bob
    2025-06-01 | PDF
    A management goal in every Secondary Road Department is to optimize the work performance of its employees. To be most effective, everyone in the department needs access to all the information about the soft assets used to do their jobs and effective communications with other staff. While this has long been accomplished via paper records, radios, ph ...
  • Research into Job Classifications for Kentucky Department of Vehicle Regulation Employees
    Research into Job Classifications for Kentucky Department of Vehicle Regulation Employees
    Brown, Mallory ;
    Martin, Andrew
    2025-06-01 | PDF
    The Kentucky Department of Vehicle Regulation (DVR) faces persistent challenges with employee recruitment, retention, and workforce alignment due to outdated job classifications and compensation structures. This study investigates if DVR’s reliance on the general Administrative Specialist job series is warranted given the duties performed by its st ...
  • Development of a Health and Wellness Assessment for KYTC Personnel
    Development of a Health and Wellness Assessment for KYTC Personnel
    Dadi, Gabriel B. ;
    Taherpour, Farshid
    2025-06-01 | PDF
    Highway construction workers operate in high-stress, hazardous settings where they have to perform physically taxing labor in environments where exposure to variable weather conditions, heavy equipment, high volumes of vehicle traffic, and other conditions that induce stress and anxiety are the norm. Up to 70% of workers in this industry have repor ...
  • Concept of Operations Active Transportation and Travel Information System
    Concept of Operations: Active Transportation and Travel Information System
    AECOM
    2025-06-01 | PDF
    The Minnesota Department of Transportation (MnDOT)’s 511 Traveler Information System. It describes a concept to improve the provision of traveler information to active transportation users. The concept advocates for the inclusion of traveler information for all transportation modes, emphasizing the needs of active transportation users, including cy ...
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