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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 381 - 400 of 36054 results
  • 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Regulation (DVR) faces persistent challenges with employee recruitment, retention, and workforce alignment due to outdated job classifications and compensation structures.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 ...
  • 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 ...
  • 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 ...
  • Assessment of LongTerm Performance of Louisiana Asphalt Pavements Summary
    Assessment of Long-Term Performance of Louisiana Asphalt Pavements [Summary]
    Mohammad, Louay N.
    2025-06-01 | PDF
    This study investigated the effectiveness of various enhanced asphalt mixture designs and construction techniques used in Louisiana since 1994, evaluating to what degree they improved long-term performance. 24 field projects were evaluated, focusing on how these enhancements impacted rutting, cracking, ride quality, and overall pavement performance ...
  • Developing and Characterizing SelfHealing Concrete for Bridge Decks
    Developing and Characterizing Self-Healing Concrete for Bridge Decks
    Banerji, Srishti ;
    Nazari, Mehrnoosh
    2025-06-01 | PDF
    This study investigates the self-healing potential of concrete with quicklime (CaO) aggregates, inspired by Roman concrete, to extend the service life of transportation infrastructure. Three concrete mixtures – control (0% quicklime), 2% quicklime (C-Q 2%), and 4% quicklime (C-Q 4%) – were tested for fresh properties, mechanical performance, durabi ...
  • 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 ...
  • Development of a Cyclic SemiCircular Bend Test to Evaluate Asphalt Mixture Crack Propagation Properties at Intermediate Temperature Summary
    Development of a Cyclic Semi-Circular Bend Test to Evaluate Asphalt Mixture Crack Propagation Properties at Intermediate Temperature [Summary]
    Mohammad, Louay N.
    2025-06-01 | PDF
    The Semi-Circular Bend (SCB) test has traditionally been conducted in a monotonic loading and displacement-controlled mode at intermediate temperatures to assess the fatigue crack resistance of asphalt mixtures. However, fatigue damage is essentially the deterioration of material integrity as a result of repeated loading. The monotonic loading of t ...
  • Development of a Process to Lower Global Warming Potential of Construction Materials
    Development of a Process to Lower Global Warming Potential of Construction Materials
    Cooper, Michelle A. ;
    Mukherjee, Amlan
    2025-06-01 | PDF
    The objective of this research was to support sustainable procurement of concrete pavements by linking materials-level global warming potential (GWP) to the project level. Infrastructure owners require reliable environmental product declarations (EPDs) and methodologies for integrating GWP into the procurement process to ensure equitable decision-m ...
  • 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 ...
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