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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 921 - 940 of 36104 results
  • Impacts of Cooperative Automated Transportation on Wyoming Highway Infrastructure
    Impacts of Cooperative Automated Transportation on Wyoming Highway Infrastructure
    Ahmed, Mohamed ;
    Ahmed, Irfan
    2024-09-01 | PDF
    The primary objectives of this research are to synthesize the state-of-the-practice of existing national, state, and local agencies regulations and legislations related to AVs/CAVs, to identify infrastructure, traffic management policy, roadway design and standardization needs in order to facilitate deployment of autonomous driving, to investigate ...
  • Design and Operational Assessment of a Mobile Robot for Undercarriage Inspection of Railcars
    Design and Operational Assessment of a Mobile Robot for Undercarriage Inspection of Railcars
    Ahmadian, Mehdi ;
    Kasch, James M
    2024-09-01 | PDF
    This research assesses the design and track operation of a track crawler robot (TCR) for practical and easy inspection of stationary railcars’ undercarriages in an effort to detect any pending failures or assess any security risk of out-of-sight objects. The TCR includes a drive system consisting of two AC motors that operate a track (like tank tra ...
  • First and Last Mile Connectivity for Missourians
    First and Last Mile Connectivity for Missourians
    Villagran, Alvaro ;
    Lauer, Peter
    2024-09-01 | PDF
    By closing gaps in transit systems or by complementing transportation services, first-last mile transportation services are integral in enabling access to employment opportunities as well as other key destinations. This research study examined first-last mile service programs across the United States and assessed existing conditions in Missouri to ...
  • Verification of ODOT Rock Channel Design Procedures Fact Sheets
    Verification of ODOT Rock Channel Design Procedures [Fact Sheets]
    Che, Daniel ;
    Bricker, Jeremy
    2024-09-01 | PDF
    The Ohio Department of Transportation (ODOT) employs rock channel protection (RCP), also known as riprap, to manage energy dissipation and prevent scouring at culvert and storm drain outlets. The design for RCP at outlets follows guidelines outlined in Figure 1002-4 of ODOT's Location and Design Manual Volume 2, incorporating specifications from OD ...
  • Use of Iowa Eggshell Waste as BioCement Materials in Pavement and Gravel Road GeoMaterial Stabilization
    Use of Iowa Eggshell Waste as Bio-Cement Materials in Pavement and Gravel Road Geo-Material Stabilization
    Yang, Bo ;
    Yin, Zexi
    2024-09-01 | PDF
    This study investigated the utilization of eggshell powder (ESP) as a bio-based cementitious material for soil stabilization in Iowa, a state recognized as the leading egg producer in the United States. The prominence of egg production in Iowa results in substantial eggshell waste, a byproduct that, despite its high calcium carbonate content, remai ...
  • Speed Management and Emergency Response a Synthesis Study
    Speed Management and Emergency Response – a Synthesis Study
    Tainter, Francis ;
    Fitzpatrick, Cole
    2024-09-01 | PDF
    The impact of speed on roadways throughout the Commonwealth of Massachusetts continues to be a critical concern in the effort of achieving zero fatalities and reducing serious injuries. Speed management solutions are plentiful, and their impact is known; what is missing is the lack of use—municipal officials may be apprehensive in implementation. T ...
  • Evaluation of Intersection Safety and Capacity Relevant to Signal Timing on Arizonas State Highway System
    Evaluation of Intersection Safety and Capacity Relevant to Signal Timing on Arizona’s State Highway System
    De Guevara, Felipe ;
    Dean, Morgan
    2024-09-01 | PDF
    Traffic signal phase-change intervals are intended to provide a safe transition between two conflicting signal phases or a right-of-way transition between conflicting road-user movements. As a result, signal phase change (includes yellow change interval, red-clearance interval, and pedestrian intervals) has significant safety and operations implica ...
  • Measuring the Impact of Roadside Features on RoadDeparture Crashes and Prioritizing Safety Improvement Projects
    Measuring the Impact of Roadside Features on Road-Departure Crashes and Prioritizing Safety Improvement Projects
    Subedi, Abhishek Kumar ;
    Markovic, Nikola
    2024-09-01 | PDF
    This study investigated the impact of roadside features on road departure (RD) crashes and provided recommendations for safety improvements on Utah’s highways. The research utilized a computer vision model originally developed in the UDOT project, Automated Safety Assessment of Rural Roadways Using Computer Vision (Mashhadi et al., 2023), which was ...
  • Understanding AI Risks in Transportation AI Assurance for Transportation Whitepaper Series
    Understanding AI Risks in Transportation: AI Assurance for Transportation Whitepaper Series
    United States. Department of Transportation. Highly Automated Systems Safety Center of Excellence
    2024-09-01 | PDF
    Our first AI Assurance (AIA) whitepaper, An Overview of AI Assurance for Transportation, was published in April 2024. One of the identified key areas for AIA research is AI risk assessment and mitigation, which has not been explored sufficiently in the past. To promote and accelerate research efforts to address AI risks, this whitepaper—as the seco ...
  • CrossModal Impact Assessment for Sustainable Transportation Networks
    Cross-Modal Impact Assessment for Sustainable Transportation Networks
    Boakye, Jessica ;
    Okte, Egemen
    2024-09-01 | PDF
    It is often difficult to compare different travel modes when it comes to assessing sustainability. That is because there are many factors guiding investment to different modes of transportation and these factors may not always be comparable from one mode to another. This study aims to develop a holistic impact measurement (HIM) methodology incorpor ...
  • ReUse Of Minnesota Waste Material In Sustainably Design Soils Part 2
    Re-Use Of Minnesota Waste Material In Sustainably Design Soils: Part 2
    Saftner, David ;
    Cai, Meijun
    2024-09-01 | PDF
    Minerals, forestry, agriculture, and industrial activities in Minnesota generate substantial by-products and waste. Strategies to reuse or recycle these can reduce landfill waste, enhance public health, conserve resources, and cut costs and emissions. Building on the frameworks by Johnson et al. (2017), Saftner et al. (2019), and Saftner et al. (20 ...
  • First and Last Mile Connectivity for Missourians Research Summary
    First and Last Mile Connectivity for Missourians [Research Summary]
    Villagran, Alvaro
    2024-09-01 | PDF
    This report discusses first-last mile transportation with a focus on access to employment. The Project Team examined first-last mile transportation services in other states in a variety of contexts, as well as the existing transportation landscape in Missouri.
  • Evaluating Sedimentation Impacts to Freshwater Mussels
    Evaluating Sedimentation Impacts to Freshwater Mussels
    Zhu, Wenyu ;
    Deng, Baolin
    2024-09-01 | PDF
    Transportation system construction activities can cause increased suspended and redeposited solids in adjacent water systems, which may adversely impact freshwater mussels. The objectives of this study are to evaluate the impacts of suspended solids on juvenile mussels including to establish the impact thresholds, to assess the effects of sediment ...
  • Roadway Cross Section Reconfiguration Responses to 14 Commonly Asked Questions Tech Brief
    Roadway Cross Section Reconfiguration: Responses to 14 Commonly Asked Questions [Tech Brief]
    Iowa State University. Institute for Transportation
    2024-09-01 | PDF
    This summary addresses some of the access management measures that might be considered when a four- to three-lane or other cross section conversion project is being implemented. Several access issues identified and discussed in the Road Diet Informational Guide (Knapp et al. 2014) are listed, and other measures included in the Iowa DOT Access Manag ...
  • Evaluating the Robustness of MDSS Forecast and Compliance with Recommendations Summary
    Evaluating the Robustness of MDSS Forecast and Compliance with Recommendations [Summary]
    Bullock, Darcy M.
    ORCID ICON IMG
    2024-09-01 | PDF
    The Indiana Department of Transportation (INDOT) adopted the Maintenance Decision Support System (MDSS) for user-defined plowing segments in the winter of 2008–2009. Since then, many new data sources, including connected vehicle data, enhanced weather data, and fleet telematics have been integrated into INDOT winter operations activities. The objec ...
  • Determining the Effectiveness of Commercial Vehicle Safety Alerts Fact Sheet
    Determining the Effectiveness of Commercial Vehicle Safety Alerts [Fact Sheet]
    Kidando, Emmanuel ;
    Kitali, Angela E
    2024-09-01 | PDF
    The Ohio Department of Transportation has partnered with Drivewyze to improve safety and mobility on Ohio’s highways, focusing on commercial vehicle safety alerts (CVSAs). Through this partnership, Drivewyze provides commercial motor vehicle (CMV) drivers with real-time alerts via in-cab electronic logging devices (ELDs). The alerts are intended to ...
  • Use of Iowa Eggshell Waste as BioCement Materials in Pavement and Gravel Road GeoMaterial Stabilization Tech Transfer Summary
    Use of Iowa Eggshell Waste as Bio-Cement Materials in Pavement and Gravel Road Geo-Material Stabilization [Tech Transfer Summary]
    Ceylan, Halil ;
    Kim, Sunghwan
    2024-09-01 | PDF
    This study aimed to evaluate the performance of Iowa eggshell waste in improving the engineering properties of Iowa geo-materials and to establish recommendations for the use of Iowa eggshell powder (ESP).
  • Control Guidelines for Aggregate Drainage Layers and Evaluation of In Situ Permeability Testing Methods for Aggregates
    Control Guidelines for Aggregate Drainage Layers and Evaluation of In Situ Permeability Testing Methods for Aggregates
    Garzon-Sabogal, Luis ;
    Getchell, Amy
    2024-09-01 | PDF
    This project examined the use of the light weight deflectometer (LWD) and the air permeameter test (APT) for control of the state of compaction and hydraulic conductivity of aggregate drainage layers. The investigation included an extensive program of LWDs, APTs, and nuclear density tests on two testing strips constructed at an experimental site—on ...
  • Determining the Effectiveness of Commercial Vehicle Safety Alerts
    Determining the Effectiveness of Commercial Vehicle Safety Alerts
    Kidando, Emmanuel ;
    Kitali, Angela E
    2024-09-01 | PDF
    The Ohio Department of Transportation has partnered with Drivewyze to improve safety and mobility on Ohio’s highways, focusing on commercial vehicle safety alerts (CVSAs). Through this partnership, Drivewyze provides commercial motor vehicle (CMV) drivers with real-time alerts via in-cab electronic logging devices (ELDs). The alerts are intended to ...
  • Effectiveness of Automated Pavement Restriping Systems Phase I Cost Comparison Between Manual and Automated Systems
    Effectiveness of Automated Pavement Restriping Systems, Phase I: Cost Comparison Between Manual and Automated Systems
    Schrock, Steven D. ;
    Liu, Lanxi
    2024-09-01 | PDF
    The Kansas Department of Transportation (KDOT) is interested in finding a more efficient and accurate restriping system than the current system in use in order to save costs and/or accomplish the same work using fewer field personnel. Therefore, this report details the potential financial advantages for KDOT to deploy an automated pavement restripi ...
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