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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 681 - 700 of 35448 results
  • Effectiveness of Automated Pavement Restriping Systems Phase I Cost Comparison Between Manual and Automated Systems Summary
    Effectiveness of Automated Pavement Restriping Systems, Phase I: Cost Comparison Between Manual and Automated Systems [Summary]
    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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Evaluating Sedimentation Impacts to Freshwater Mussels Research Summary
    Evaluating Sedimentation Impacts to Freshwater Mussels [Research Summary]
    Baolin, Deng
    2024-09-01 | PDF
    This project was to 1) evaluate the impacts of suspended solids on juvenile mussels, 2) assess the effects of sediment deposition on adult and subadult mussels, 3) develop a particle tracking model, and 4) evaluate the existing and potential mitigation approaches for mussel protection. The comprehensive research included a literature review, a Depa ...
  • 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.
  • Grand Forks East Grand Forks Regional ITS Architecture Update Version 50
    Grand Forks - East Grand Forks Regional ITS Architecture Update: Version 5.0
    Hasan, MD Sharijad
    2024-09-01 | PDF
    The Grand Forks-East Grand Forks Regional Intelligent Transportation Systems (ITS) Architecture was developed under the leadership of the Grand Forks-East Grand Forks Metropolitan Planning Organization (GF-EGF MPO). This architecture has been updated three times since its original development—in 2008, 2014, and 2019. The goal of the GF-EGF regional ...
  • Lessening Density Requirement and Adjusting Density Pay Factors for Asphalt Pavements in Poor Sublayer Conditions
    Lessening Density Requirement and Adjusting Density Pay Factors for Asphalt Pavements in Poor Sublayer Conditions
    Kang, Kyubyung ;
    Lee, Jinwoong
    2024-09-01 | PDF
    Current quality control and quality assurance practices for asphalt pavements rely heavily on density (%Gmm) measurements, which are directly linked to pay adjustments. However, these practices can inadvertently encourage over-compaction, leading to issues such as aggregate segregation, crushing, and reduced pavement quality, especially under poor ...
  • Use of Drilling Parameters for Enhancing Geotechnical Site Investigations with Applications to Rock Assessment
    Use of Drilling Parameters for Enhancing Geotechnical Site Investigations with Applications to Rock Assessment
    Benoit, Jean ;
    Souza, Bruma
    2024-09-01 | PDF
    This report summarizes the research conducted using Measurement While Drilling (MWD) technology that was recently implemented as part of routine geotechnical investigations conducted by the New Hampshire Department of Transportation (NHDOT). MWD is a system that consists of several sensors directly mounted or connected to a drill rig to monitor all ...
  • 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 ...
  • 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 ...
  • 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).
  • Comprehensive Pavement Patching Tools and WebBased Software for Pavement Condition Assessment and Visualization
    Comprehensive Pavement Patching Tools and Web-Based Software for Pavement Condition Assessment and Visualization
    Jha, Sneha ;
    Zhang, Yaguang
    2024-09-01 | PDF
    It is a common practice among state agencies to manually inspect road segments and decide maintenance requirements based on the pavement condition index (PCI). However, standalone PCI only evaluates the pavement surface condition. When coupled with the variability in human perception of pavement distress, this limits the accuracy of current pavemen ...
  • 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 ...
  • Robust DecisionMaking Framework for Sustainable Operations and Planning of MBTA Rapid Transit Vehicles
    Robust Decision-Making Framework for Sustainable Operations and Planning of MBTA Rapid Transit Vehicles
    Han, Zhuo ;
    Christofa, Eleni
    2024-09-01 | PDF
    Urban Rail Transit (URT) systems play a critical role in modern cities but consume significant amounts of energy. Understanding and predicting energy consumption patterns in these systems is vital for sustainable urban planning, especially during disruptive events. This study presents a Long Short-Term Memory (LSTM) recurrent neural network, the mo ...
  • Evaluating the Robustness of MDSS Forecast and Compliance with Recommendations
    Evaluating the Robustness of MDSS Forecast and Compliance with Recommendations
    Brinster, Gregory L ;
    Desai, Jairaj
    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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Exploring Apex Predator Effects on WildlifeVehicle Collisions A Case Study on Wolf Reintroductions in Yellowstone
    Exploring Apex Predator Effects on Wildlife-Vehicle Collisions: A Case Study on Wolf Reintroductions in Yellowstone
    Bell, Matthew ;
    Huijser, Marcel P.
    2024-09-01 | PDF
    This study investigates the impact of wolf reintroduction on wildlife-vehicle collisions (WVCs) along a segment of US-191 bordering Yellowstone National Park. Wolves were reintroduced in 1995–1996, and subsequent wolf pack establishment may have influenced the behavior and population dynamics of prey species, potentially altering WVC patterns. Usin ...
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