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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 361 - 380 of 35438 results
  • Division of Engineering Research OnCall ROC Task 08 Reexamining Level of Service as a Measure of Effectiveness for Roadway Improvements
    Division of Engineering Research On-Call (ROC) Task #08 - Re-examining Level of Service as a Measure of Effectiveness for Roadway Improvements
    Weiss, Jacob ;
    Buckmaster, Morgan
    2025-03-01 | PDF
    This report evaluates the effectiveness of Level of Service (LOS) as a metric for roadway improvements. The study examines alternative measures, such as Vehicle Miles Traveled (VMT) or Vehicle Hours Traveled (VHT) and other Measures of Effectiveness (MOE) to assess roadway performance beyond traditional peak-hour analyses. By analyzing practices fr ...
  • Division of Engineering ROC 202426 Task 8 Reexamining Level of Service as a Measure of Effectiveness for Roadway Improvements Fact Sheet
    Division of Engineering ROC 2024-26 – Task 8: Re-examining Level of Service as a Measure of Effectiveness for Roadway Improvements [Fact Sheet]
    Weiss, Jacob ;
    Buckmaster, Morgan
    2025-03-01 | PDF
    This report evaluates the effectiveness of Level of Service (LOS) as a metric for roadway improvements. The study examines alternative measures, such as Vehicle Miles Traveled (VMT) or Vehicle Hours Traveled (VHT) and other Measures of Effectiveness (MOE) to assess roadway performance beyond traditional peak-hour analyses. By analyzing practices fr ...
  • Development of a Worker Safety Assessment Risk Identification and Control Program for ALDOT
    Development of a Worker Safety Assessment, Risk Identification, and Control Program for ALDOT
    Zech, Wesley C. ;
    Kirby, Jason
    2025-03-01 | PDF
    This research examines the safety challenges faced by Transportation Maintenance Technicians (TMTs) at the Alabama Department of Transportation (ALDOT). By analyzing extensive injury data from 2009 to 2024, along with insights from surveys and interactions with ALDOT personnel, this effort highlights significant trends and relationships among injur ...
  • Development of Measures for Highway Criticality Assessment
    Development of Measures for Highway Criticality Assessment
    Zhang, Xu ;
    Chen, Mei
    2025-03-01 | PDF
    Existing network criticality assessments, often biased towards heavily used highways in populous areas by incorporating traffic and sociodemographic attributes, can lead to an underestimation of the vital role of rural infrastructure. Consequently, rural highways, particularly low-volume roads, often receive less consideration despite their critica ...
  • TRACtion A Research Agenda for Just and Sustainable Transportation
    TRACtion: A Research Agenda for Just and Sustainable Transportation
    Matute, Juan ;
    Engelhardt, Chase
    2025-03-01 | PDF
    This report proposes a new research agenda for transportation sustainability. This agenda emerges from TRACtion: Transformative Research and Collaboration, a new approach to community-researcher collaboration that seeks to match UCLA’s academic expertise with the wisdom and perspectives of community groups and advocacy organizations. It is a partne ...
  • Michigan Department of Transportation Fleet Electrification Strategies
    Michigan Department of Transportation Fleet Electrification Strategies
    Bodarya, Mihir ;
    Dagci, Oguz
    2025-02-28 | PDF
    The Michigan Department of Transportation (MDOT) relies on data to make informed decisions regarding its vehicle fleet, which totals approximately 4,800 units. Recognizing the environmental impact of its operations, MDOT is exploring alternative fuel and electric vehicle technologies to meet its diverse needs. This research, conducted by Hatch, an ...
  • 07112 Development of a Continuous for Live Load Prefabricated Steel Accelerated Bridge Construction ABC Unit for Texas Bridges
    0-7112: Development of a Continuous for Live Load Prefabricated Steel Accelerated Bridge Construction (ABC) Unit for Texas Bridges
    Hurlebaus, Stefan ;
    Mander, John
    2025-02-28 | PDF
    This research study developed and evaluated prefabricated steel bridges made continuous for live load utilizing accelerated bridge construction (ABC). The project created a steel ABC transverse connection detail at the bridge piers that allows the structure to behave as simply supported for dead load and continuous for live load. This detail is rel ...
  • Identification of CostEffective Winter Maintenance Chemicals
    Identification of Cost-Effective Winter Maintenance Chemicals
    Hart, Robert ;
    Hershey, Benjamin
    2025-02-28 | PDF
    Research Project SD2022-02 used the Maintenance Decision Support System (MDSS) to simulate the effect of five treatment materials on South Dakota highways and determine the most cost-effective treatment material options in each of the 25 maintenance units in the state. This document reports the results of the simulations and data analyses.
  • Evaluation of Commercial ForwardLooking Infrared Driver Assistance Technology for Use in Emergency Tow Trucks and Snowplows
    Evaluation of Commercial Forward-Looking Infrared Driver Assistance Technology for Use in Emergency Tow Trucks and Snowplows
    Shargh, Mohammad Mahdi Naddaf ;
    Lee, Andrew
    2025-02-28 | PDF
    This report details the development and evaluation of an innovative component in a traffic management system that can enhance road safety during severe weather conditions. Severe weather conditions, such as dense fog, heavy rain, and snow, significantly hinder road safety by reducing visibility and increasing the risk of collisions, particularly fo ...
  • Bridges Designed for Minimum Maintenance
    Bridges Designed for Minimum Maintenance
    ElBatanouny, Mohamed K. ;
    Wagner, Elizabeth
    2025-02-11 | PDF
    Service-life based designs of highway bridges have gained significant interest from state DOTs in recent years. The primary purpose of these efforts is to provide durability-based designs for bridges and bridge elements that require minimal maintenance during the targeted service life of the structure. This is achieved by defining different target ...
  • RiskBased Methodology for Structural Evaluation of BridgeSized Culverts
    Risk-Based Methodology for Structural Evaluation of Bridge-Sized Culverts
    Yang, David Y ;
    White, Kevin
    2025-02-07 | PDF
    This report presents the results of the project sponsored by the Federal Highway Administration (FHWA), “Risk-Based Methodology for Structural Evaluation of Bridge-Sized Culverts”. The goal of this project was to develop general methodology to (a) quantify uncertainty, especially live load uncertainty, unique to bridge-sized RC box culverts and (b) ...
  • Electric Vehicles and Socioeconomic Inequity in Access to the Charging Network on Virginia Roads
    Electric Vehicles and Socioeconomic Inequity in Access to the Charging Network on Virginia Roads
    Yoo, Dong Kyoon
    2025-02-01 | PDF
    Electric vehicles (EVs) are becoming attractive to consumers due to their ability to reduce greenhouse gas (GHG) emissions, lower operating costs, and benefit from government incentives. Yet a barrier to EV adoption is the lack of direct current fast charging (DCFC) stations, which contributes to range anxiety. Studies also show that DCFC stations ...
    Supporting Files
  • Design and Demonstration of an ArterialFriendly Local Ramp Metering Control System Research Summary
    Design and Demonstration of an Arterial-Friendly Local Ramp Metering Control System [Research Summary]
    Liu, Yi
    2025-02-01 | PDF
    This project aims to develop, assess, and optimize control strategies for ramp metering and local signal synchronization in Maryland's Transportation Systems Management and Operations (TSMO) 1 system (I-70 corridor east of Baltimore, MD). The methodology and mesoscopic simulation model can be generally applicable to other networks and TSMO systems.
  • Effectiveness of Short Solid Barriers to Reduce Noise Generated by Different Types of Highway Vehicles Research Summary
    Effectiveness of Short Solid Barriers to Reduce Noise Generated by Different Types of Highway Vehicles [Research Summary]
    Owolabi, Oludare
    2025-02-01 | PDF
    The purpose of this study was to determine how well short concrete barriers work to reduce noise from passing cars. The goal was to give the State Highway Administration (SHA) information so they could determine if these barriers could be utilized to reduce traffic noise.
  • Development of a Traffic Management Decision Support Tool for Freeway Incident Traffic Management FITM Plan Deployment Phase 3 An Incident Duration and Impact Prediction IDIP System Research Summary
    Development of a Traffic Management Decision Support Tool for Freeway Incident Traffic Management (FITM) Plan Deployment Phase 3: An Incident Duration and Impact Prediction (IDIP) System [Research Summary]
    Chang, Gang-Len
    2025-02-01 | PDF
    The primary goal of this study is to finalize the IDIP system’s development so that CHART can reliably project the impacts of a detected incident, from detection to clearance, on its target freeway and neighboring local networks. With all essential functions developed in this phase for IDIP, CHART’s incident response team can conveniently estimate ...
  • FiberReinforced Concrete Overlays for Bridge Structures
    Fiber-Reinforced Concrete Overlays for Bridge Structures
    Ozyildirim, H. Celik ;
    Sharifi, Mary
    2025-02-01 | PDF
    The common distresses in bridge decks are the loss of surface texture due to traffic and poor construction practices that result in cracks and spalls because of the reinforcement corroding. The common repair procedure for such distresses is removing the top surface of the deteriorated concrete and placing a low-permeability concrete overlay. Someti ...
  • A Roadmap for Missouri Assessing Needs an Implementation Framework for Incorporating Environmental Product Declarations
    A Roadmap for Missouri: Assessing Needs an Implementation Framework for Incorporating Environmental Product Declarations
    Kevern, John T. ;
    Buttlar, William G.
    2025-02-01 | PDF
    This report details the Missouri Department of Transportation’s activities within the Federal Highway Administration’s Climate Challenge program. The purpose of the program was three-fold, 1) to increase knowledge of environmental product declarations (EPDs) within the Missouri asphalt and concrete industry, 2) to assess the current state of Missou ...
  • A Roadmap for Missouri Assessing Needs an Implementation Framework for Incorporating Environmental Product Declarations Summary
    A Roadmap for Missouri: Assessing Needs an Implementation Framework for Incorporating Environmental Product Declarations [Summary]
    Kevern, John T. ;
    Buttlar, William G.
    2025-02-01 | PDF
    This report details the Missouri Department of Transportation’s activities within the Federal Highway Administration’s Climate Challenge program. The purpose of the program was three-fold, 1) to increase knowledge of environmental product declarations (EPDs) within the Missouri asphalt and concrete industry, 2) to assess the current state of Missou ...
  • Suitability of Using Crushed Concrete Adjacent to Geotextiles in Underdrain Systems Second Phase Field Trial Before Implementation
    Suitability of Using Crushed Concrete Adjacent to Geotextiles in Underdrain Systems Second Phase: Field Trial Before Implementation
    Tanyu, Burak F ;
    Abbaspour, Aiyoub
    2025-02-01 | PDF
    Due to the increasing interest in the use of recycled concrete as a base course aggregate, the Virginia Department of Transportation (VDOT) identified the need for an in-depth research investigate the clogging potential of the geotextile used in highway edge drains if crushed hydraulic cement concrete (CHCC) is placed adjacent to the drainage fabri ...
  • HighSpeed Faulting Measuring Device for Jointed Concrete Pavements
    High-Speed Faulting Measuring Device for Jointed Concrete Pavements
    Li, Ruohan ;
    Hernandez, Joaquin B.
    2025-02-01 | PDF
    Current equipment to measure faulting of jointed concrete pavements at the network level is ineffective and inefficient. One the one hand, joint detection at high speeds is challenging. On the other hand, the actual measurement is not accurate and fails to capture the transverse variability of faulting. In this project, a high- definition, high-spe ...
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