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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 2921 - 2940 of 35959 results
  • Calibration of Structural Layer Coefficients for North Carolina Asphalt Pavements
    Calibration of Structural Layer Coefficients for North Carolina Asphalt Pavements
    Underwood, B. Shane ;
    Castorena, Cassie
    2022-01-26 | PDF
    The North Carolina Department of Transportation (NCDOT) uses the 1993 AASHTO Guide for Design of Pavement Structures to determine the minimum pavement stiffness that will ensure pavement longevity. For design, the contribution from any given layer is calculated by the product of that layer’s thickness and a structural layer coefficient that capture ...
  • Evaluation of Dynamic Speed Feedback Signs on Freeway Interchange Ramps
    Evaluation of Dynamic Speed Feedback Signs on Freeway Interchange Ramps
    Gates, Timothy J. ;
    Mahmud, Md Shakir
    2022-01-23 | PDF
    Dynamic speed feedback signs (DSFS) are promising countermeasure to reduce curve speeds and subsequent lane departures at freeway interchange ramps, although their use in such contexts has been limited. Consequently, the impact of DSFS on driver performance at interchange ramps remains unproven. To that end, research was performed to determine the ...
  • Automatic Road Feature Extraction from StateOwned Mobile LiDAR Data for Traffic Safety Analysis and Evaluation
    Automatic Road Feature Extraction from State-Owned Mobile LiDAR Data for Traffic Safety Analysis and Evaluation
    Xu, Hao ;
    Weston, James
    2022-01-20 | PDF
    The mobile LiDAR data is a promising solution to the existing road feature data gap based on its high accuracy and extended road network coverage. However, because of the lack of an automatic measuring tool, road features are currently read by data operators and measured manually in the cloud points. This project developed an ArcGIS toolbox—Automat ...
  • Quantifying Correlations Between Winter Severity Road Conditions and VTrans Snow and Ice Control Activities Final Report
    Quantifying Correlations Between Winter Severity, Road Conditions, and VTrans’ Snow and Ice Control Activities: Final Report
    Dowds, Jonathan ;
    Sullivan, James L.
    2022-01-19 | PDF
    Season-to-season variability in winter weather and the absence of quantifiable methods for measuring either winter severity or snow and ice control (SIC) performance have made planning and budgeting for SIC activities challenging. Recent research initiatives undertaken by VTrans and other snowbelt DOTs have established objective measures for weathe ...
  • Needed Skills in the Transportation Workforce in the Context of New and Emerging Technologies and Approaches
    Needed Skills in the Transportation Workforce, in the Context of New and Emerging Technologies and Approaches
    Wickland, Teo
    ORCID ICON IMG
    2022-01-01 | PDF
    The United States’ transportation workforce is currently at a skills deficit in key areas. New and innovative transportation technologies and approaches threaten to exacerbate this situation. Yet, transportation workers need more than skills to implement new technologies: they need the skills to critically determine which technologies are likely to ...
  • Primer PopUp Traffic Calming Placemaking
    Primer Pop-Up Traffic Calming & Placemaking
    MacFarlane, Jennifer
    ORCID ICON IMG
    2022-01-01 | PDF
    Traffic calming features improve conditions for non-motorized modes of travel such as walking and biking. Physical changes to the roadway can create an environment that naturally slows traffic and increases pedestrian visibility in the immediate vicinity (Federal Highway Administration, 2016). Beyond injury and crash prevention, additional benefits ...
  • Getting Back on Track Policy Solutions to Improve California Rail Transit Projects
    Getting Back on Track: Policy Solutions to Improve California Rail Transit Projects
    Elkind, Ethan N ;
    Segal, Katie
    2022-01-01 | PDF
    This report combines a cost baseline analysis with five case studies of California rail projects (four local transit projects and California’s High-Speed Rail project) to identify the causes of high project costs, slow deployment, and overruns/delays beyond initial project estimates. Baselines were developed from an analysis of two prominent transi ...
  • Mixed Methods Approaches to Wildfire Evacuation Modeling Behavior Simulation and Equity
    Mixed Methods Approaches to Wildfire Evacuation: Modeling Behavior, Simulation, and Equity
    Grajdura, Sarah Allison
    2022-01-01 | PDF
    This dissertation presents several aspects of short-notice wildfire evacuation, using empirical findings from the 2018 Camp Fire in Butte County, California. I examine the manner and timing in which people find out about and begin evacuating in a short notice wildfire. Using these findings, I build a simulation model of such a disaster, and examine ...
  • Assessing the Impact of Chloride Deicer Application in the Siskiyou Pass Southern Oregon
    Assessing the Impact of Chloride Deicer Application in the Siskiyou Pass, Southern Oregon
    Stonewall, Adam J ;
    Yates, Matthew C
    2022-01-01 | PDF
    Chloride deicers have been applied by the Oregon Department of Transportation (ODOT) to Interstate Route 5 (I–5) from the Oregon-California border north to mile marker 10 for several years in the high-elevation area known as the Siskiyou Pass. Magnesium chloride (MgCl2) and sodium chloride (NaCl) are applied to keep the interstate highway safe for ...
  • Development of Tools to Model Driver Behavior in a Cooperative and Driverless Vehicle Mixed Roadway Environment
    Development of Tools to Model Driver Behavior in a Cooperative and Driverless Vehicle Mixed Roadway Environment
    Hunter, Michael ;
    Guin, Angshuman
    2022-01-01 | PDF
    Promising advances in autonomous vehicle (AV) technology have fueled industry and research fields to dedicate significant efforts to the study of the integration of AVs into the traffic network. While most studies anticipate a beneficial role of AVs, contributing to improved traffic efficiency and roadway safety, the underlying assumptions on the i ...
  • Division of Planning Research OnCall Task8 Assessment and Prioritization of Culverts for Enhanced Fish Passage
    Division of Planning Research On-Call Task#8 - Assessment and Prioritization of Culverts for Enhanced Fish Passage
    Daniels, Natalie Kruse ;
    Bowman, Jen
    2022-01-01 | PDF
    Culverts can be an impediment to fish passage, impacting fish populations and spawning of both migratory and non-migratory species. With increased opportunities to invest in both water resources and infrastructure, prioritizing and selecting potential locations for culvert replacement to remove fish barriers is timely. In this project, we engaged w ...
  • Use of Thermal Integrity Profiling TIP in Drilled Shaft Evaluation
    Use of Thermal Integrity Profiling (TIP) in Drilled Shaft Evaluation
    Boeckmann, Andrew ;
    Yeskoo, R Andrew
    2022-01-01 | PDF
    Thermal Integrity Profiling (TIP) methods have emerged as a viable concrete integrity test method alternative to crosshole sonic logging (CSL). The objective of this study was to evaluate TIP methods for potential implementation on MoDOT drilled shaft projects. The study included a review of experience from previous research and project application ...
  • US Department of Transportation Equity Action Plan
    U.S. Department of Transportation Equity Action Plan
    United States. Department of Transportation
    2022-01-01 | PDF
    The U.S. Department of Transportation (USDOT or Department) is committed to pursuing a comprehensive approach to advancing equity for all. In response to Executive Order 13985: Advancing Racial Equity and Support for Underserved Communities Through the Federal Government, this Equity Action Plan highlights key actions that USDOT will undertake to e ...
  • Continuous Field Validation of a Wireless Structural Monitoring and Bridge WeighinMotion BWIM System
    Continuous Field Validation of a Wireless Structural Monitoring and Bridge Weigh-in-Motion (BWIM) System
    Bolander, Peter ;
    Wang, Yang
    2022-01-01 | PDF
    This report details the implementation of a wireless structural monitoring and bridge weigh-in-motion system. The goal of the project is to develop, install, and maintain a wireless structural monitoring system to perform long-term bridge weigh-in-motion. The developed system adopts the Martlet wireless sensing system for data collection and monito ...
  • Domestic Airline Fares Consumer Report Third Quarter 2021 Passenger and Fare Information
    Domestic Airline Fares Consumer Report: Third Quarter 2021 Passenger and Fare Information
    United States. Department of Transportation
    2022-01-01 | Domestic Airline Fares Consumer Report | PDF
    Each month the Department of Transportation releases an Air Travel Consumer Report that includes information about various service quality elements, including flight delays, mishandled baggage, over sales, and a variety of other types of consumer complaints. In response to an increasing number of inquiries from consumers about domestic airline pric ...
  • Evaluating the Impact of Detour Messaging on Actual Driver Detour Behavior
    Evaluating the Impact of Detour Messaging on Actual Driver Detour Behavior
    Acharya, Sailesh ;
    Mekker, Michelle
    2022-01-01 | PDF
    There is limited research on the effects of variable message sign (VMS) message content on revealed driver behavior. This study investigated the associations of message content with diversion rate during crash incidents using 5 years of VMS message history within a section of I-15 in the state of Utah. The diversion rate was found to be higher when ...
  • Implementation of Portable WeighinMotion WIM Technology on Texas Highways Workshop
    Implementation of Portable Weigh-in-Motion (WIM) Technology on Texas Highways: Workshop
    Texas A&M Transportation Institute
    2022-01-01 | PDF
    Workshop on Implementation of Portable Weigh in Motion (WIM) Technology on Texas Highways.
  • Improved Reliability of FWD Test Results and Correlations With Resilient Modulus
    Improved Reliability of FWD Test Results and Correlations With Resilient Modulus
    Gupta, Kanika ;
    Park, Sung Soo
    2022-01-01 | PDF
    Resilient modulus (MR) is a key factor in the Mechanistic Empirical Pavement Design Guide (MEPDG) which was adopted by INDOT in January 2009. The resilient modulus can be determined in new pavement projects from subgrade soil samples collected at the site. However, for a pavement rehabilitation project, it becomes difficult to obtain soil informati ...
  • Demonstration of the Applicability of the New CPTUSCPTU Correlations With Soil Parameter Evaluation
    Demonstration of the Applicability of the New CPTU/SCPTU Correlations With Soil Parameter Evaluation
    Miller, Gerald A. ;
    Abuawad, Tareq Z
    2022-01-01 | PDF
    Nine test sites across the state of Oklahoma were investigated using the Seismic Cone Penetration Test with pore water pressure measurement (SCPTu). Field testing was conducted during wet and dry periods to observe the effect of moisture conditions on the data collected from the field. Disturbed and undisturbed samples were collected at each site t ...
  • Understanding the Evolution of Hydrogen Supply Chains in the Western United States An OptimizationBased Approach Focusing on California as a Future Hydrogen Hub
    Understanding the Evolution of Hydrogen Supply Chains in the Western United States: An Optimization-Based Approach Focusing on California as a Future Hydrogen Hub
    Vijayakumar, Vishnu
    2022-01-01 | PDF
    Interest in hydrogen as a clean source of energy has grown considerably over the past decade. With its ambitious climate goals and a vibrant economy, California looks poised to become one of the major hydrogen hubs in the country. However, insufficient infrastructure to support demand and lack of economies of scale, are critical factors that have i ...
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