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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 1021 - 1040 of 35448 results
  • Analysis of Lateral Spreading Effects on Bridge Foundations
    Analysis of Lateral Spreading Effects on Bridge Foundations
    Qiu, Zhijian ;
    Lu, Jinchi
    2024-04-01 | PDF
    This research is directed towards enhancements to the assessment and mitigation of liquefaction induced lateral spreading effects on bridge foundation systems. The conducted research scope and outcomes are presented. On this basis, insights are derived for improvement of the current assessment procedures, and mitigation of this detrimental mechanis ...
  • Use of Recycled Asphalt Pavement in Rubberized Hot Mix Asphalt Gap Graded
    Use of Recycled Asphalt Pavement in Rubberized Hot Mix Asphalt — Gap — Graded
    Mateos, Angel ;
    Harvey, John T
    2024-04-01 | PDF
    Current Caltrans Standard Specifications for rubberized hot mix asphalt–gap-graded (RHMA-G) do not allow the inclusion of reclaimed asphalt pavement (RAP). This report summarizes the research conducted by the UCPRC in support of the Caltrans-industry initiative “10% RAP in RHMA-G,” whose goal is to evaluate the use of up to 10% RAP (by aggregate re ...
  • PerformanceRelated Specifications for Pavement Milling
    Performance-Related Specifications for Pavement Milling
    Cho, Seonghwan ;
    Moncada, Oscar Andrés
    2024-04-01 | PDF
    The primary objective of this research was to evaluate pavement damage that may occur during the pavement milling process, which is critical to the overlay design and performance of asphalt pavements. To achieve this purpose, the most common milling practices in Indiana were implemented on several trial sections and various damage characterization ...
  • An Overview of AI Assurance for Transportation
    An Overview of AI Assurance for Transportation
    United States. Department of Transportation. Highly Automated Systems Safety Center of Excellence
    2024-04-01 | PDF
    AI assurance refers to the techniques, activities, and processes used to evaluate and assure expected properties of AI components or AI-enabled systems throughout the lifecycle of these components or systems. The properties may relate to performance, safety, or security. Typical examples of AI assurance techniques are verification, validation, and ...
  • Network Screening on LowVolume Roads Using Risk Factors
    Network Screening on Low-Volume Roads Using Risk Factors
    Huda, Kazi Tahsin ;
    Al-Kaisy, Ahmed
    2024-04-01 | PDF
    This paper proposes a new method for network screening on rural low-volume roads. These roads are important as they provide critical access to agricultural land and tourist attractions. Most low-volume roads belong to the lowest functional class (local rural roads) and thus are built to lower design standards. Conventional hot spot network screenin ...
  • VISSIM Simulation Calibration Procedure
    VISSIM™ Simulation Calibration Procedure
    Hunter, Michael ;
    Rodgers, Michael O.
    2024-04-01 | PDF
    Underlying most VISSIM™ calibration is the adjustment of the Wiedemann car following parameters used to simulate vehicle behavior within the model. The Wiedemann models directly influence a roadway segment’s capacity, saturation flow, density, etc. Several key features were identified as part of this study. Through the project a calibration approac ...
    Supporting Files
  • Statewide Calibration of CPT Direct Design Methods Using Static Load Test Data Research Project Capsule 243GT
    Statewide Calibration of CPT Direct Design Methods Using Static Load Test Data: Research Project Capsule [24-3GT]
    Abu-Farsakh, Murad Y. ;
    Rupnow, Tyson
    2024-04-01 | PDF
    Deep foundations are typically considered when subsurface soil conditions are weak and unable to safely support superstructure loads. In these cases, pile foundations are used to carry superstructure loads and transfer them deep into the ground. Therefore, an accurate assessment of pile resistance is crucial for the safe and economical design of pi ...
  • Removing Residual Lane Markings to Reduce Driver Confusion
    Removing Residual Lane Markings to Reduce Driver Confusion
    Hurwitz, David ;
    Jashami, Hisham
    2024-04-01 | PDF
    This research studied the relationship between removal methods used to remove pavement markings and driver confusion when encountering ghost lines. The study included field based and driver video experiments. Video data was collected at five locations in Oregon to examine the frequency with which drivers did not follow the correct markings when enc ...
  • Possible Methodology for Probabilistic Assessment of Bridge Safety Against Collisions
    Possible Methodology for Probabilistic Assessment of Bridge Safety Against Collisions
    Silva, Pedro F ;
    Dong, Pan
    2024-04-01 | PDF
    This report presents a possible stochastic methodology that can be used in identifying bridges with greater probability of failure from vehicular collisions. To meet this objective, this report first outlines the design of bridges against these collisions in the United States and compares against the Eurocode design methodology. Existing experiment ...
  • Safety and User Perceptions of Auxiliary Bike Lanes
    Safety and User Perceptions of Auxiliary Bike Lanes
    Hurwitz, David ;
    Jashami, Hisham
    2024-04-01 | PDF
    This research studied Oregon drivers’ and cyclists’ conceivability of and receptivity to bike turnouts (auxiliary bike lanes). The driver and cyclist survey consisted of 32 and 35 questions, respectively, all of which were fixed choice, except for 3 open-ended response questions. The surveys were distributed online to 612 Oregon residents, made up ...
  • Effects of Road Collisions on the Travel Behavior of Vulnerable Groups Expert Interview Findings
    Effects of Road Collisions on the Travel Behavior of Vulnerable Groups: Expert Interview Findings
    Bhuiya, Md. Musfiqur Rahman ;
    Barajas, Jesus M.
    2024-04-01 | PDF
    We interviewed eight subject-matter experts in California in 2023 to understand how travel behavior and priorities may change in response to direct experience with road collisions. Experts represented a variety of perspectives, including medical doctors, advocates for active transportation safety, and advocates for people with disabilities. Their d ...
  • Assessing the Total Cost of Ownership of Electric Vehicles Among California Households
    Assessing the Total Cost of Ownership of Electric Vehicles Among California Households
    Chakraborty, Debapriya ;
    Konstantinou, Theodora
    2024-04-01 | PDF
    The primary metric for measuring electric vehicle (EV) adoption growth is new car sales. However, to enable mass market penetration, EV adoption in the used car market will play a crucial role. The used vehicle market is relatively understudied or has been studied mostly for specific regions. This project analyzed US national consumer expenditure s ...
  • Lessons Learned from Abroad Potential Influence of California HighSpeed Rail on Economic Development Land Use Patterns and Future Growth of Cities
    Lessons Learned from Abroad: Potential Influence of California High-Speed Rail on Economic Development, Land Use Patterns, and Future Growth of Cities
    Loukaitou-Sideris, Anastasia ;
    Circella, Giovanni
    2024-04-01 | PDF
    This study discusses the potential economic and development impacts that high-speed rail (HSR) may bring to California. The research reviews the reported impacts of HSR implementation in various countries, particularly in Europe, and case studies of selected HSR station-cities in France, Spain, and Italy. The analysis suggests that HSR could bring ...
  • Temperature Effects in MatchCast Segmental Bridge Construction Summary
    Temperature Effects in Match-Cast Segmental Bridge Construction [Summary]
    Potter, William ;
    Riding, Kyle A
    2024-04-01 | PDF
    The three main objectives of this research were to identify bridge segment geometries (width to length ratios) susceptible to this type of distortion, develop best practices to mitigate transverse bowing of match-cast bridge segments during production, and to determine which practical curing mitigation measures are most effective in reducing bowing ...
  • Effect of Increased Precipitation Heavy Rain Events on Minnesota Pavement Foundations
    Effect of Increased Precipitation (Heavy Rain Events) on Minnesota Pavement Foundations
    Jibon, Md ;
    Sourav, Md Abdullah All
    2024-04-01 | PDF
    The Midwest region of the United States, including Minnesota, has been experiencing an increase in the number of heavy precipitation events. Historical precipitation data confirmed an increasing trend of heavy precipitation in Minnesota in the 21st century. This study focused on assessing the impact of heavy-precipitation events on moisture levels ...
  • Performance Evaluation of Different Detection Technologies for Signalized Intersections in Minnesota
    Performance Evaluation of Different Detection Technologies for Signalized Intersections in Minnesota
    Grossman, Malcolm ;
    Jiao, Yuankun
    2024-04-01 | PDF
    This research evaluates the performance of non-intrusive detection technologies (NITs) for traffic signals in Minnesota. Prior work shows that while no single NIT device performs best in all situations, under specific circumstances, some NIT devices consistently outperform others. Our goal in this research is to find which NIT devices perform bette ...
  • Construction Work Zone Safety SpatioTemporal Analysis of Construction Work Zone Crashes
    Construction Work Zone Safety: Spatio-Temporal Analysis of Construction Work Zone Crashes
    Mashhadi, Ali Hassandokht ;
    Rashidi, Abbas
    2024-04-01 | PDF
    This report presents a comprehensive analysis of work zone safety considering multiple factors, including crash severity, speed analysis, countermeasure analysis, and state-of-the-practice in DOTs. It encompasses a broad literature review, drawing from DOT reports, NCHRP publications, MUTCD guidelines, and academic research, to explore a range of t ...
  • Speed Limits in Texas
    Speed Limits in Texas
    Fitzpatrick, Kay ;
    Venglar, Steven P.
    2024-04-01 | 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. Within this TxDOT project ...
  • Traffic Control Device Analysis Testing and Evaluation Program FY2023 Activities
    Traffic Control Device Analysis, Testing, and Evaluation Program: FY2023 Activities
    Finley, Melisa D. ;
    Pratt, Michael P.
    2024-04-01 | 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 ...
  • Bats and Bridges Integrating Biology and CloudBased Modeling
    Bats and Bridges: Integrating Biology and Cloud-Based Modeling
    Perez-Jimenez, Janette ;
    Koch, Jacob
    2024-04-01 | PDF
    Accurately predicting bat use of bridges is an important need for planning of bridge repair and maintenance. However, less than 1% of bridges in Ohio have been surveyed for bats, limiting the inferences that can be drawn from existing data and modelling tools. We developed a method for passive camera surveys of bat use of bridges and reevaluated OD ...
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