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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 701 - 720 of 36841 results
  • Strategies for Addressing Deteriorated Concrete Roads Research Summary
    Strategies for Addressing Deteriorated Concrete Roads [Research Summary]
    Bektas, Fatih ;
    Ous, Greg
    2025-06-01 | PDF
    This Research Summary is part of the final deliverable for Report 2025-29, "Sustaining Performance of ASR-Affected Pavements: Effective Practices and Insights."
  • Update to ARDOT Superpave Gyratory Compaction SGC Specification to Increase Pavement Durability
    Update to ARDOT Superpave Gyratory Compaction (SGC) Specification to Increase Pavement Durability
    Braham, Andrew ;
    Hall, Kevin
    2025-06-01 | PDF
    The primary goal ofTRC2201 was to enhance the durability of asphalt pavements in Arkansas. This was accomplished through two steps: exploring extreme scenarios with lab mixtures and comparing eight field sites. Further analysis was conducted using Pavement ME and a life-cycle cost analysis. In the extreme scenario, air voids decreased as Pb and N l ...
  • Testing Recycled Plastics in Asphalt and Concrete Pavement Mixes Research Summary
    Testing Recycled Plastics in Asphalt and Concrete Pavement Mixes [Research Summary]
    Ceylan, Halil ;
    Johnson, Jim
    2025-06-01 | PDF
    This Research Summary is part of the final deliverable for Report 2025-28, "Use of Plastics in Road Materials (Paving).
  • 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 ...
  • 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 ...
  • Rural Transit Fact Book 2025
    Rural Transit Fact Book 2025
    Mattson, Jeremy ;
    Peterson, Del
    2025-06-01 | PDF
    Public transportation plays a fundamental role in the livability of communities of all sizes. The Rural Transit Fact Book provides information on transit service availability and cost to help the transit industry in the United States provide efficient and effective service to meet rural community mobility needs. Financial and operating statistics c ...
  • 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 ...
  • Field Evaluation of Reinforced Concrete Repairs Using Hydrodemolition Galvanic Cathodic Protection or Impressed Current Cathodic Protection
    Field Evaluation of Reinforced Concrete Repairs Using Hydrodemolition, Galvanic Cathodic Protection, or Impressed Current Cathodic Protection
    Sharp, Stephen R ;
    Ozyildirim, Celik
    2025-06-01 | PDF
    For the Virginia Department of Transportation (VDOT), substructure repairs are costly, and the durability is a concern. Current conventional concrete removal methods commonly use chipping hammers and shotcrete or self-consolidating concrete (SCC), plus discrete galvanic point (DGP) anodes, for such repairs. The types of concrete VDOT uses in these ...
  • 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 ...
  • 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 Standard Practice for the Design of OpenGraded Friction Course OGFC Mixtures with Epoxy Asphalt Technical Summary
    Development of a Standard Practice for the Design of Open-Graded Friction Course (OGFC) Mixtures with Epoxy Asphalt [Technical Summary]
    Mohammad, Louay N.
    2025-06-01 | PDF
    Open-graded friction course (OGFC) is a thin asphalt mixture surface layer. It is gap-graded with a high percentage of coarse aggregates that are nearly uniform in size, resulting in a high percentage of interconnected air voids and asphalt binder, which provides improved skid resistance, visibility, and decreased pavement-tire noise. However, cons ...
  • Estimating Disadvantaged Populations Based on Public Data
    Estimating Disadvantaged Populations Based on Public Data
    Xu, Yiqing ;
    Dougald, Lance E
    2025-06-01 | PDF
    This report develops robust estimation models to address data challenges for identifying disadvantaged populations, defined by low-income, racial minority, and limited English proficiency (LEP) status, which aligns with the Virginia Department of Transportation’s (VDOT) SMART SCALE definition. The current reliance on American Community Survey data ...
  • 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 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 ...
  • 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 ...
  • Seismically Resilient Bridge Bents with Stretch Length Anchors as Energy Dissipators
    Seismically Resilient Bridge Bents with Stretch Length Anchors as Energy Dissipators
    Neupane, Suman ;
    Pantelides, Chris P.
    2025-06-01 | PDF
    Accelerated bridge construction (ABC) using precast concrete bents has substantial potential to improve construction time and seismic performance in earthquake-prone regions. This study investigates the seismic performance of hybrid self-centering bridge bents that employ unbonded post-tensioning (PT) bars for self-centering and replaceable stretch ...
  • 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 ...
  • 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 ...
  • Understanding WildlifeVehicle Collisions in Illinois
    Understanding Wildlife-Vehicle Collisions in Illinois
    Stodola, Kirk W ;
    Finney, Noah I
    2025-06-01 | PDF
    Wildlife-vehicle collisions are a common and costly occurrence on U.S. roadways. An estimated 1 million vertebrates are killed on American roads each day. Most wildlife-vehicle collisions of importance occur with deer. The goal of the proposed research is to better understand wildlife-vehicle collisions in Illinois and to identify mitigation strate ...
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