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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 1721 - 1740 of 35865 results
  • Digitizing Traffic Control Infrastructure for Autonomous Vehicles AV Summary
    Digitizing Traffic Control Infrastructure for Autonomous Vehicles (AV) [Summary]
    Steele, Joanne ;
    Wu, Jason
    2023-08-01 | PDF
    High precision road maps are a crucial component to facilitating autonomous driving techniques. Autonomous vehicles (AVs) are experiencing exponential growth. According to the latest forecast from IHS Markit, over 33 million AVs will be on the road globally by 2040, posing a higher requirement to ensure AVs’ driving safety. Although current AVs rel ...
  • Increase the Allowable Content of Recycled Crushed Concrete Aggregate in Class P Concrete
    Increase the Allowable Content of Recycled Crushed Concrete Aggregate in Class P Concrete
    Drimalas, Thanos ;
    Lute, Racheal D
    2023-08-01 | PDF
    Over 140 million tons of recycled concrete aggregate (RCA) are produced in the United States per year (ACPA, 2009), and this material has been used in a host of transportation infrastructure applications, including fills, embankments, bases, subbases, and concrete pavements. Currently, TxDOT limits the maximum amount of recycled crushed concrete fi ...
  • Enhancing Pavement Marking Management Practices in Wyoming
    Enhancing Pavement Marking Management Practices in Wyoming
    Tajnin, Mst Rahanuma ;
    Farid, Ahmed
    2023-08-01 | PDF
    Pavement markings safeguard road users, and maintaining adequate retroreflectivity is crucial for ensuring road safety. As the Wyoming Department of Transportation (WYDOT) performs routine application of pavement markings, there is a pressing need for a comprehensive management program to ensure their cost-effective management. So, this report focu ...
  • WSDOT Maintenance Performance Measure Algorithms
    WSDOT Maintenance Performance Measure Algorithms
    Shrestha, Kishor
    ORCID ICON IMG
    2023-08-01 | PDF
    This research project focuses on deteriorating roadway asset conditions, emphasizing the challenges encountered by the roadway maintenance division of the Washington State Department of Transportation (WSDOT). The project goal is to develop algorithms for prediction models that will forecast the levels of service (LOS) performance conditions of six ...
  • Evaluation of Hybrid Rubber Modified Asphalt Mixtures and Pavements A Case Study in Virginia
    Evaluation of Hybrid Rubber Modified Asphalt Mixtures and Pavements: A Case Study in Virginia
    Habbouche, Jhony ;
    Nair, Harikrishnan
    2023-08-01 | PDF
    Several state departments of transportation have recognized the benefits of modified asphalt mixtures in resisting multiple modes of climate-and load-induced distresses in flexible pavements. Throughout the past 50 years, asphalt binders have been modified with various components such as styrene-butadiene-styrene (SBS) polymers, ground tire rubber, ...
  • Pullout Resistance of Reinforcement of Lightweight Cellular Concrete Fill
    Pullout Resistance of Reinforcement of Lightweight Cellular Concrete Fill
    Han, Jie ;
    Ye, Yuqiu
    2023-08-01 | PDF
    Lightweight Cellular Concrete (LCC) (also called foam or gas concrete) is a special construction material, which is typically composed of portland cement, water, and air voids created by a foaming agent. This material has been increasingly used as a backfill material for geotechnical applications. This report presents a series of laboratory tests c ...
  • Performance Evaluation of SP95 and SP125 Superpave Mixtures Summary
    Performance Evaluation of SP-9.5 and SP-12.5 Superpave Mixtures [Summary]
    Wilko, Wayne ;
    Hu, Sheng
    2023-08-01 | PDF
    The objective of this project was to compare the performance of SP-9.5/FC-9.5 to SP-12.5/FC-12.5 Superpave asphalt mixtures and then determine if SP-9.5/FC-12.5 mixtures were at least equivalent to SP-12.5/FC-12.5 mixtures in terms of cracking and rutting resistance, including durability, for use in heavy traffic volume conditions.
  • Pullout Resistance of Reinforcement of Lightweight Cellular Concrete Fill Technical Summary
    Pullout Resistance of Reinforcement of Lightweight Cellular Concrete Fill [Technical Summary]
    Han, Jie ;
    Ye, Yuqiu
    2023-08-01 | PDF
    This report presents a series of laboratory tests to evaluate the material properties of LCC and the pullout resistances of geogrid and steel strip in LCC specimens cast in the field. Based on the test results, the following conclusions can be drawn: The average wet densities of LCC ranged from 30 to 36 pcf at the age of 28 days and the average dry ...
  • Rural Intersections within Passing Lanes
    Rural Intersections within Passing Lanes
    Fitzpatrick, Kay ;
    Brewer, Marcus A.
    2023-08-01 | PDF
    Super 2 highways are used across Texas to provide passing opportunities and increase capacity on rural two-lane roads, but passing lanes are a treatment for through vehicles and do not address the needs of turning vehicles. This project investigated the operational and safety benefits of turning treatments on two-lane and Super 2 corridors, as well ...
  • Development of Potential Strategies for Unmarked and Low Traffic Volume Roadways in Illinois
    Development of Potential Strategies for Unmarked and Low Traffic Volume Roadways in Illinois
    Rajagopal, Arudi (Raj) ;
    Mercurio, John
    2023-08-01 | PDF
    The present study was initiated by the Illinois Department of Transportation (IDOT) to better understand characteristics of roadway segments categorized as unmarked in IDOT’s Transportation Asset Management Plan and to suggest recommendations to manage, vacate, abandon, retain, or transfer individual routes. The researchers developed a methodology, ...
  • Improved California Truck Traffic Census Reporting and Spatial Activity Measurement
    Improved California Truck Traffic Census Reporting and Spatial Activity Measurement
    Ritchie, Stephen G. ;
    Tok, Andre
    2023-08-01 | PDF
    The Federal Highway Administration (FHWA) vehicle classification scheme is designed to serve various transportation operational and planning needs. Many transportation agencies rely on Weigh-In-Motion and automatic vehicle classification sites to collect vehicle classification count data. However, these systems are not widely deployed due to high i ...
  • Strategies to Preserve Transitaccessible Affordable Housing in Southern California
    Strategies to Preserve Transit-accessible Affordable Housing in Southern California
    Parker, Madeleine E.G ;
    Chapple, Karen
    2023-08-01 | PDF
    This report highlights risk and prioritization factors for housing developments with expiring affordability protections, focused on preserving transit-accessible affordable housing. It presents a regional framework for identifying and preserving subsidized affordable housing in the Southern California Association of Governments (SCAG) region (Los A ...
  • Effectiveness of Highway Safety Public Education at Montana Motor Vehicle Registration Stations by Streaming a Variety of Safety Content
    Effectiveness of Highway Safety Public Education at Montana Motor Vehicle Registration Stations by Streaming a Variety of Safety Content
    Villwock-Witte, Natalie ;
    Clouser, Karalyn
    2023-08-01 | PDF
    State departments of transportation, including the Montana Department of Transportation (MDT) focus on eliminating fatalities and serious injuries on our roadways. To accomplish this, MDT employed several strategies including an emphasis on improving traffic safety culture. Traffic safety culture strategies, including public awareness campaigns and ...
  • Traffic Control Device Analysis Testing and Evaluation Program FY2022 Activities
    Traffic Control Device Analysis, Testing, and Evaluation Program: FY2022 Activities
    Finley, Melisa D. ;
    Venglar, Steven P.
    2023-08-01 | PDF
    Traffic control devices are a primary means of communicating highway information to road users. The design, application, and maintenance of traffic control devices are under constant transformation as new technologies, methodologies, and policies are introduced. This project provides the Texas Department of Transportation with a mechanism to conduc ...
  • Traffic Control Device Analysis Testing and Evaluation Program FY2021 Activities
    Traffic Control Device Analysis, Testing, and Evaluation Program: FY2021 Activities
    Finley, Melisa D. ;
    Theiss, LuAnn
    2023-08-01 | PDF
    Traffic control devices are a primary means of communicating highway information to road users. The design, application, and maintenance of traffic control devices are under constant transformation as new technologies, methodologies, and policies are introduced. This project provides the Texas Department of Transportation with a mechanism to conduc ...
  • Smart Connected and Automated Vehicle Fleet Management Developing Regional Dispatch Decision Support for Congestion Mitigation
    Smart Connected and Automated Vehicle Fleet Management: Developing Regional Dispatch Decision Support for Congestion Mitigation
    Cummings, M ;
    Rouphail, Nagui M.
    2023-08-01 | PDF
    With the arrival of new technologies like connected and self-driving autonomous vehicles (AVs), the workload of regional dispatchers will increase. To this end, the CADS (Congestion Alerting Decision Support) tool was developed to support strategic transportation planning (on the order of weeks to months) and tactical transportation planning (on th ...
  • District Highway Maintenance ResearchOnCall Task 8 Improving the Process of Removing Totem Poles
    District Highway Maintenance Research-On-Call Task 8: Improving the Process of Removing Totem Poles
    Witter, Jonathan D ;
    Nazzal, Munir
    2023-08-01 | PDF
    Roadside vegetation management can be a time-consuming and potentially dangerous task, particularly on steep embankments typical of unglaciated regions in Ohio. Furthermore, tree clearing is usually undertaken during difficult weather conditions (i.e., snowy, icy) as regulations for agencies that receive federal funding limit clearing to protect ha ...
  • Impacts of Hydraulic Modeling Methods on Bridge Scour Analysis
    Impacts of Hydraulic Modeling Methods on Bridge Scour Analysis
    Cox, Amanda L. ;
    Luna, Ronaldo
    2023-08-01 | PDF
    This study has three primary purposes: 1) to investigate the impacts of hydraulic modeling methods on bridge scour analysis, 2) to develop recommendations for sediment/soil sampling methods, and 3) to conduct bridge scour risk assessments. Field data were collected at five study sites to obtain the required terrain and soil/sediment input data for ...
    Supporting Files
  • Pile Setup and Restrike Procedures
    Pile Setup and Restrike Procedures
    Rosenblad, Brent L. ;
    Boeckmann, Andrew Z.
    2023-08-01 | PDF
    The primary objective of this research is to provide MoDOT with rational procedures and guidelines to incorporate pile setup in MoDOT pile design. Pile setup refers to the time-dependent increase in the capacity of driven piles that occurs after the end of piledriving. High-strain dynamic load test data from end of driving (EOD) and beginning of re ...
  • Economic Effect of Active Transportation Features and the Association Between the Healthcare Industry and Transportation
    Economic Effect of Active Transportation Features and the Association Between the Healthcare Industry and Transportation
    Dunlop, Steven R ;
    Ukkusuri, Satish
    2023-08-01 | PDF
    The goal of this project is to help INDOT determine the economic effects of active transportation features, the impact of transportation infrastructure on the healthcare industry, and to explore a potential relationship between active transportation and healthcare. To capture the details thoroughly, the analysis was done at a macro and micro level. ...
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