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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 35412 results
  • 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 ...
  • Assessing SpeedingRelated Crashes in Louisiana to Support to Safe System Approach Brief
    Assessing Speeding-Related Crashes in Louisiana to Support to Safe System Approach [Brief]
    Moomen, Milhan ;
    Rupnow, Tyson
    2025-06-01 | PDF
    The role of vehicle operating speed in traffic crashes is a complex issue, as speeding-related crashes continue to pose significant challenges. Speed greatly impacts both the frequency of crashes and the severity of the resulting injuries. Additionally, excessive speed raises the likelihood of losing control during evasive maneuvers and amplifies c ...
  • Effectiveness of Geosynthetics in SoilAggregate StabilizationEvaluation Using Bender Element Sensor Technology
    Effectiveness of Geosynthetics in Soil/Aggregate Stabilization—Evaluation Using Bender Element Sensor Technology
    Wang, Han ;
    Qamhia, Issam I. A.
    2025-06-01 | PDF
    This report presents laboratory evaluations of the effectiveness of geosynthetics in stabilizing unbound aggregate layers and develops design guidelines for using geosynthetic-stabilized pavements in Illinois. The research focused on quantifying benefits from geosynthetic mechanical stabilization and incorporating those benefits into pavement analy ...
  • Evaluation Tool for Proposed MultiUse Trails
    Evaluation Tool for Proposed Multi-Use Trails
    Moruza, Audrey K ;
    Chen, T. Donna
    2025-06-01 | PDF
    This report describes a screening tool for comparing multi-use trails (MUTs) that could compete for funding from the Virginia Department of Transportation (VDOT) or other state sources. The tool scores, based on selected geographic information system (GIS)-processed factors for which metrics are available by trail segment, are calculated in Excel u ...
  • Evaluate Modify and Adapt the ConcreteWorks Software for Iowas Use Phase II
    Evaluate, Modify, and Adapt the ConcreteWorks Software for Iowa’s Use, Phase II
    Wang, Kejin ;
    Riding, Kyle A
    2025-06-01 | PDF
    This Phase II project contained two parts. Part A focused on the investigation of the characteristics and thermal properties of commonly used slags in Iowa cementitious materials and their effects on adiabatic temperature rise (ATR) in Iowa mass concrete structures. A new hydration model for slag-containing cementitious materials and a three-parame ...
  • 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 ...
  • Project Summary Active Transportation and Traveler Information
    Project Summary: Active Transportation and Traveler Information
    Minnesota. Department of Transportation
    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 ...
  • User Guide Interactive Online Map Value of Dedicated Right of Way
    User Guide: Interactive Online Map: Value of Dedicated Right of Way
    Minnesota. Department of Transportation. Research Services & Library
    2025-06-01 | PDF
    MnDOT research has developed a modeling tool that identifies the bus route segments that would benefit most from the installation of a dedicated right of way (ROW) for buses. Transit service reliability is one of the most requested service improvements. By implementing a transit ROW where needed most, MnDOT can improve transit reliability and bette ...
  • 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 ...
  • Sustaining Performance of ASRAffected Pavements Effective Practices and Insights
    Sustaining Performance of ASR-Affected Pavements: Effective Practices and Insights
    Bektas, Fatih
    2025-06-01 | PDF
    Alkali-silica reaction (ASR) remains a significant durability concern in concrete pavements, leading to internal cracking, surface deterioration, and loss of ride quality. Although preventive measures have reduced ASR in new construction, pavements built in Minnesota in the 1980s and 1990s continue to exhibit distress. This study evaluates maintena ...
  • 5GEnabled Safe and Robust Deep MultiAgent Reinforcement Learning Framework for CAV Coordination
    5G-Enabled Safe and Robust Deep Multi-Agent Reinforcement Learning Framework for CAV Coordination
    Miao, Fei ;
    Han, Song
    2025-06-01 | PDF
    We address the problem of coordination and control of Connected and Automated Vehicles (CAVs) in the presence of imperfect observations in mixed traffic environment. A commonly used approach is learning-based decision-making, such as reinforcement learning (RL). However, most existing safe RL methods suffer from two limitations: (i) they assume acc ...
    Supporting Files
  • 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 ...
  • 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 ...
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