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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 581 - 600 of 36053 results
  • 2024 GDOT Employee Survey
    2024 GDOT Employee Survey
    Durham, Stephan A. ;
    DeMeester, Karen
    2025-02-01 | PDF
    The research team which included faculty from University of Georgia’s College of Engineering and Carl Vinson Institute of Government worked in collaboration with the Georgia Department of Transportation (GDOT) to conduct the 2024 GDOT employee survey. This research study aimed to increase the response rate and the usefulness of the feedback from th ...
  • Value of Dedicated RightofWay Transit Service Reliability and User Impacts
    Value of Dedicated Right-of-Way: Transit Service Reliability and User Impacts
    Song, Ying ;
    Zeng, Xiaohuan
    2025-02-01 | PDF
    Transit services connect people to jobs and opportunities, fostering vibrant communities and multimodal travel along service corridors. A transit right-of-way (ROW) can help buses bypass congestion and stay on schedule. Many studies have proved that transit ROWs effectively improve service reliability and reduce user costs. However, these studies o ...
  • A Study of Suburban Arterial Safety Performance Based on Median Type
    A Study of Suburban Arterial Safety Performance Based on Median Type
    Tarko, Andrew P. ;
    Guo, Qiming
    2025-02-01 | PDF
    Suburban arterial roadways must serve two conflicting road functions: regional mobility and access to the abutting land. The potential for conflicts between traffic passing through and traffic accessing road from the neighboring areas could raise safety concerns. Selecting an adequate cross-section is among important decisions that road designers a ...
  • Investigation of Commercial Motor Vehicle CMVRelated Crashes in Ohio Work Zones Fact Sheet
    Investigation of Commercial Motor Vehicle (CMV)-Related Crashes in Ohio Work Zones [Fact Sheet]
    Finley, Melisa D. ;
    Lopez, Nicholas
    2025-02-01 | PDF
    This research project was conducted to identify causation trends and factors that contribute to commercial motor vehicle (CMV)-involved work zone crashes in Ohio. In addition, the research project examined how workspace access points contribute to the CMV crash risk in work zones. In Phase 1, the research team reviewed previous research findings, c ...
  • Use of Geothermal Energy for DeIcing Approach Pavement Slabs and Bridge Decks Phase II
    Use of Geothermal Energy for De-Icing Approach Pavement Slabs and Bridge Decks – Phase II
    Yu, Xinbao ;
    Puppala, Anand J.
    2025-02-01 | PDF
    Bridges in many parts of Texas are prone to icing on the bridge deck during winter events, which poses severe travel disruptions and potential accidents to the drivers. Therefore, bridge deicing is critical to ensure roadway safety, mobility, and productivity reasons. This study tested and implemented a geothermal bridge deicing system (GBDS) as a ...
  • Effects of Additives in Deicing Salts at Lower Temperatures
    Effects of Additives in Deicing Salts at Lower Temperatures
    Fay, Laura ;
    Jamal, Mueed
    2025-02-01 | PDF
    The goal of this project was to investigate the effects of additives commonly used in deicers for winter road maintenance operations, explore the qualitative and quantitative benefits of these additives, laboratory and performance data, impacts, and relative performance to sodium chloride (NaCl). Additionally, evaluate the impact additives have on ...
  • Managing the Traffic Impacts of Highway Infrastructure Constructions A Framework for Construction Planning
    Managing the Traffic Impacts of Highway Infrastructure Constructions: A Framework for Construction Planning
    Liu, Jun ;
    Xu, Ningzhe
    2025-02-01 | PDF
    Highway infrastructure construction projects often necessitate temporary traffic pattern changes, such as lane or road closures, which can impact mobility, safety, and the environment. This report presents a systematic framework and tool designed to assist transportation agencies in evaluating and comparing alternative construction plans. The frame ...
  • Five County Association of Governments Regional Mobility Study
    Five County Association of Governments Regional Mobility Study
    Campoll, Christy
    2025-02-01 | PDF
    The purpose of the Five County Association of Governments (AOG) Regional Mobility Study is to identify options to meet the mobility needs of transportation-disadvantaged individuals in Beaver, Garfield, Iron, Kane, and Washington Counties. The research included a literature review; inventory of transportation providers in the Five County AOG region ...
  • Application of Cementitious Materials and Fiber Reinforcement to Enhance Lime Stabilization for Nebraska Shale Soils
    Application of Cementitious Materials and Fiber Reinforcement to Enhance Lime Stabilization for Nebraska Shale Soils
    Eun, Jongwan ;
    Kim, Seunghee
    2025-02-01 | PDF
    Lime stabilization is a widely used technique to improve weak subgrades; however, its effectiveness under freeze-thaw cycles remains a critical challenge. This study investigates the incorporation of cementitious materials and fiber to enhance the mechanical properties and environmental resistance of lime-stabilized soils under such conditions. Two ...
  • Pavement Rehabilitation and Design Strategy for Heavy Loads in the Energy Development Areas
    Pavement Rehabilitation and Design Strategy for Heavy Loads in the Energy Development Areas
    Zhou, Fujie ;
    Scullion, Tom
    2025-02-01 | PDF
    In recent years, rapid energy development in Texas has caused significant damage to many farm-to-market (FM) roads, which traditionally have a thin asphalt surface layer plus a stabilized base directly over the subgrade. These FM roads performed well under normal traffic loads but failed dramatically under the energy-sector truck loads. There is an ...
  • 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
  • Testing the Hurricane Evacuation Modeling Package HEMP
    Testing the Hurricane Evacuation Modeling Package (HEMP)
    Bian, Ruijie “Rebecca”
    2025-02-01 | PDF
    This project studied if and how behavioral models and traffic simulation frameworks created beforehand could be used to predict hurricane evacuation patterns in a new storm setting, with the anticipation of being able to conduct a real-time simulation in the future. Using publicly available data, this study first created synthetic populations by ye ...
  • Testing the Hurricane Evacuation Modeling Package HEMP Summary
    Testing the Hurricane Evacuation Modeling Package (HEMP) [Summary]
    Bian, Ruijie “Rebecca” ;
    Mitran, Elisabeta
    2025-02-01 | PDF
    This project studied if and how behavioral models and traffic simulation frameworks created beforehand could be used to predict hurricane evacuation patterns in a new storm setting, with the anticipation of being able to conduct a real-time simulation in the future. Using publicly available data, this study first created synthetic populations by ye ...
  • Safety Performance of NonSignalized Traffic Control Strategies Brief
    Safety Performance of Non-Signalized Traffic Control Strategies [Brief]
    Tarko, Andrew P. ;
    Romero, Mario A.
    2025-02-01 | PDF
    The Indiana safety management program targets the reduction of crashes at high-speed, two-way stop-controlled (TWSC) intersections, which are responsible for 8.2% of serious crashes statewide that cause approximately 1,000 serious injuries and over 90 fatalities annually. Key risk factors include human error, high traffic volumes, and high speeds. ...
  • Safety Performance of NonSignalized Traffic Control Strategies
    Safety Performance of Non-Signalized Traffic Control Strategies
    Tarko, Andrew P. ;
    Romero, Mario A.
    2025-02-01 | PDF
    The Indiana safety management program targets the reduction of crashes at high-speed, two-way stop-controlled (TWSC) intersections, which are responsible for 8.2% of serious crashes statewide that cause approximately 1,000 serious injuries and over 90 fatalities annually. Key risk factors include human error, high traffic volumes, and high speeds. ...
  • TR808 A Sustainable AirEntraining and Internal Curing Agent
    TR-808: A Sustainable Air-Entraining and Internal Curing Agent
    Yellavajjala, Ravi Kiran ;
    Jalal, Asif
    2025-02-01 | PDF
    Air entrainment of concrete is crucial to dissipate the tensile stresses introduced by the volume expansion of frozen water in the capillary pores of the concrete. The air void system achieved using popular surfactants is sensitive to the properties of cementitious materials, water content, admixtures, aggregate, etc. Furthermore, vibration, compac ...
  • Assessing the Deterioration of Pedestrian Assets
    Assessing the Deterioration of Pedestrian Assets
    Nlenanya, Inya ;
    Smadi, Omar G.
    2025-02-01 | 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 ...
  • Current Practices in Rock Scaling
    Current Practices in Rock Scaling
    Greer, Daryl J. ;
    Ashurst Jr, Kean H.
    2025-02-01 | PDF
    Rockfalls, which result from the chemical and physical weathering of aging exposed rock cuts, occur frequently along many Kentucky roadways and can endanger travelers. Mitigating rockfalls often requires substantial excavation, procuring additional right of way, and/or hiring specialty contractors. An alternative to these expensive processes is roc ...
  • Organization and Analysis of Measurement While Drilling MWD Data
    Organization and Analysis of Measurement While Drilling (MWD) Data
    Link, Curtis A ;
    Barrick, David J.
    2025-02-01 | PDF
    The scope of the MDT funded research project highlighted collection and organization of data onto a portal, data review and quality control and analysis of relationships between MWD drilling parameters and rock properties. Our initial approach was investigation of traditional linear correlations between individual MWD drilling parameters and rock p ...
  • Development of Procedures and Technologies for Chip Seal Construction Quality Control in Oregon
    Development of Procedures and Technologies for Chip Seal Construction Quality Control in Oregon
    Baran, Servan ;
    Sukhija, Mayank
    2025-02-01 | PDF
    Given budget constraints and increasing traffic in Oregon, chip seals have emerged as a cost-effective and practical approach for maintaining and preserving the existing highway network. This study focused on establishing efficient Quality Assurance (QA) procedures for chip seals, aligning with SPR777's design method to increase the performance and ...
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