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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 561 - 580 of 36053 results
  • HalfRound Bearing Stiffeners for Skewed Steel IGirders Brief
    Half-Round Bearing Stiffeners for Skewed Steel I-Girders [Brief]
    Mehrabi, Armin
    ORCID ICON IMG
    2025-03-01 | PDF
    Skewed steel I-girder bridges present unique structural challenges due to their angled geometry, which affects load distribution and increases potential for fatigue and stress concentrations. Traditional connection methods, such as bent plate connections, can introduce flexibility, leading to reduced stability. FDOT is exploring Half-Round Bearing ...
  • Improved Incident Response through Coordinated Interoperable Communications
    Improved Incident Response through Coordinated, Interoperable Communications
    Moomen, Milhan ;
    Rahman, Ashifur
    2025-03-01 | PDF
    This study aimed to conduct a needs assessment and performance evaluation of Traffic Incident Management (TIM) in Louisiana and identify areas for TIM improvement. The study also aimed to assess interoperability as a solution to communication gaps. The research team achieved this by performing evaluations and assessments of Louisiana’s TIM and comm ...
  • Technical Assistance for Quantifying Emissions from Asphalt Mixtures
    Technical Assistance for Quantifying Emissions from Asphalt Mixtures
    Sadeghi, M ;
    Bairgi, B K
    2025-03-01 | PDF
    This study evaluated the effects of using Warm Mix Asphalt (WMA) technologies to reduce asphalt production temperatures on energy consumption and pavement performance in Alabama. Two field experiments were conducted. The first compared two chemical WMA mixtures to a conventional Hot Mix Asphalt (HMA), while the second used one of the WMA technologi ...
  • Evaluate Performance of Sealers and Coatings Applied to TxDOT Bridge Substructures
    Evaluate Performance of Sealers and Coatings Applied to TxDOT Bridge Substructures
    Mukhopadhyay, Anol K. ;
    Mistri, Abhijit
    2025-03-01 | PDF
    Protecting concrete bridge substructures against deterioration over time is an important aspect of bridge preservation, and it is routinely conducted by state departments of transportation. The application of coatings and sealers to protect bridge substructure concrete from corrosion is a common practice. However, a laboratory-based performance eva ...
  • A Synthesis of Economic Impact Assessment of Transit Services Brief
    A Synthesis of Economic Impact Assessment of Transit Services [Brief]
    Peng, Zhong-Ren
    2025-03-01 | PDF
    This report provides an in-depth synthesis of the economic impact assessment of transit services in the United States from 2003 to 2023, focusing on Benefit-Cost Analysis (BCA) and Economic Impact Analysis (EIA) methodologies. It examines their application in public transit systems and highlights geographical variations and trends. The report analy ...
  • Increasing Regional Truck Freight Planning in Virginia
    Increasing Regional Truck Freight Planning in Virginia
    Miller, John S ;
    Parambil, Nishara Vavitta
    2025-03-01 | PDF
    Although the forecast rate of growth for truck vehicle miles traveled is roughly double the forecast rate of growth for passenger vehicle miles traveled, specific planning techniques to address truck freight planning needs are not widely known. Accordingly, to elevate the importance of truck freight within the regional planning process, this study ...
    Supporting Files
  • Setting Speed Limits Spanish Version
    Setting Speed Limits: Spanish Version
    Texas A&M Transportation Institute
    2025-03-01 | PDF
    Posted speed limits (PSLs) are a highly complex issue involving engineering, human factors, and political and societal concerns. On a national level, recent research along with calls to change how speed limit are set, especially for city streets, have generated extensive discussion on future speed limit setting procedures. Recent Texas Department o ...
  • Determining the Effect on Asphalt Mixture Performance by Increasing New Asphalt Binder Content Due to Inactive RAP Binder in the Mixture Brief
    Determining the Effect on Asphalt Mixture Performance by Increasing New Asphalt Binder Content Due to Inactive RAP Binder in the Mixture [Brief]
    Yin, Fan
    2025-03-01 | PDF
    The project aimed to determine the impact of adding additional virgin binders in consideration of recycled binder availability (RBA) on the performance of asphalt mixtures containing reclaimed asphalt pavements (RAP). To that end, a literature review was first conducted to select a suitable RBA value (i.e., 80%) for RBA mixtures in Florida, followe ...
  • Advanced 59GHz Interference Resiliency for Connected Vehicle Equipment
    Advanced 5.9GHz Interference Resiliency for Connected Vehicle Equipment
    Kihei, Billy ;
    Grow, James
    2025-03-01 | PDF
    In this work the research team reports on the effectiveness of various techniques to mitigate Wi-Fi 5 interference on Vehicle-to-Everything communications and provide a means to reliably detect Wi-Fi 5 interference. Following previous work conducted in RP 22-18, the research team performed three research investigations in this new work. The first i ...
  • Modeling and Predicting the Deterioration of Pedestrian Assets Summary
    Modeling and Predicting the Deterioration of Pedestrian Assets [Summary]
    CTC & Associates LLC
    2025-03-01 | PDF
    Pedestrian assets, particularly sidewalks, are highly susceptible to aging, adverse weather conditions, and suboptimal construction practices, often leading to rapid deterioration. This deterioration is often ignored due to the widespread misconception that pedestrian assets are low risk, resulting in many deteriorated sidewalks being left untreate ...
  • The Transportation Security Index
    The Transportation Security Index
    Murphy, Alexandra K.
    ORCID ICON IMG
    2025-03-01 | PDF
    Transportation Security Index.
  • Remaining Service Life Prediction of Indiana Pavements Using Mechanistic Methods
    Remaining Service Life Prediction of Indiana Pavements Using Mechanistic Methods
    Cho, Seonghwan ;
    Park, Bongsuk
    2025-03-01 | PDF
    Accurate remaining service life (RSL) prediction facilitates effective pavement maintenance strategies, extends service quality, and reduces costs. This study developed RSL prediction models for major distresses in INDOT pavement—including full-depth asphalt flexible, rigid, and composite pavement—using Falling Weight Deflectometer (FWD) and Intern ...
  • 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.
  • 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 ...
  • 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 ...
  • 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 ...
  • Maintenance Preservation Solution Matrix MPSM
    Maintenance Preservation Solution Matrix (MPSM)
    Premkumar, Laxmikanth ;
    Talha, S. Abu
    2025-02-21 | PDF
    The goal of this study was to identify optimal preventative treatment types and timing of treatments throughout the service life cycles of pavements. The research was carried out in two phases. Phase 1 involved a comprehensive literature review to examine factors that influence the service life of pavements, including treatment application timing, ...
  • 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) ...
  • Interlaboratory Study for the Indirect Tensile at High Temperature Test and Ideal Rutting Test
    Interlaboratory Study for the Indirect Tensile at High Temperature Test and Ideal Rutting Test
    Boz, Ilker ;
    Diefenderfer, Stacey D.
    2025-02-01 | PDF
    The Indirect Tensile at High Temperature (IDT-HT) test and Ideal Rutting (IR) test were recommended for screening rut-susceptible asphalt mixtures in the Balanced Mix Design (BMD) process, based on a research study by the Virginia Transportation Research Council (VTRC). The Virginia Department of Transportation (VDOT) is in the initial stages of im ...
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