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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 5881 - 5900 of 36053 results
  • Understanding Transportation Related Infrastructure Access in 52 Major US Cities
    Understanding Transportation Related Infrastructure Access in 52 Major US Cities
    Jiao, Junfeng
    ORCID ICON IMG
    2019-04-01 | PDF
    Transit deserts are urban areas with poor transportation related infrastructure access. In these areas, transit demands usually exceed transit supplies. In this project we refined the concept of transit deserts further and introduce the new concept of transit oases and transit adequate areas. We then applied our methods to 52 US cities. We found th ...
  • Identifying Roadway Physical Characteristics that Contribute to Emissions Differences between Hybrid and Conventional Vehicles
    Identifying Roadway Physical Characteristics that Contribute to Emissions Differences between Hybrid and Conventional Vehicles
    Sullivan, James ;
    Sentoff, Karen
    2019-04-01 | PDF
    In this study, a second-by-second (SbS) data set obtained from monitoring vehicle emissions over a series of 75 test runs from 2 test vehicles (a conventional vehicle (CV) and a hybrid-electric vehicle (HEV)) over an 18-month period in 2010-2011 during real-world on-road operations on a specified 32-mile route in Chittenden County, Vermont was used ...
  • Analysis of the Relationship of Roadside Inspections on Large Truck Crashes
    Analysis of the Relationship of Roadside Inspections on Large Truck Crashes
    Lu, Pan ;
    Lantz, Brenda Michelle
    2019-04-01 | PDF
    About 3,341 large truck related fatal crashes happened in United States in 2011, and more than 3,700 people died, which accounted for more than 11% of all motor vehicle fatal crashes and fatalities, even though large trucks only accounted for 4% of registered vehicles and 9% of vehicle-miles traveled (VMT) (USDOT, 2013). Large truck VMT decreased 6 ...
  • Driverless Cars and Accessibility Designing the Future of Transportation for People with Disabilities
    Driverless Cars and Accessibility: Designing the Future of Transportation for People with Disabilities
    Bayless, Steven H. ;
    Davidson, Sara
    2019-04-01 | PDF
    This report summarizes current challenges that people with disabilities face and speculates as to which requirements might be necessary for a “fully automated” and “fully accessible” vehicle to indeed be accessible. There are still gaps in accessibility and plenty of lessons learned from several decades of experience with the Americans with Disabil ...
  • Impact of Shared Autonomous Vehicles SAVs on Vehicle Miles Traveled VMT in Utah
    Impact of Shared Autonomous Vehicles (SAVs) on Vehicle Miles Traveled (VMT) in Utah
    Haghighi, Nima ;
    Chamberlin, Robert
    2019-04-01 | PDF
    Autonomous Vehicles (AVs) can provide benefits and flexibility leading to significant reductions in the generalized cost of travel and, potentially, more demand for travel. The combination of the AV technology with Mobility as a Service (MaaS) will create a new disruptive transportation mode – Shared Autonomous Vehicles (SAVs) that have the promise ...
  • Compaction Testing of Granular Material 2019
    Compaction Testing of Granular Material [2019]
    Jones, Allen ;
    Weber, Jason
    2019-04-01 | PDF
    The South Dakota Department of Transportation (SDDOT) wishes to reevaluate its current methods of compaction quality control of granular materials. The SDDOT uses the Ohio Highway Department’s Typical Moisture Density Curves for performing compaction quality control on granular soil materials in conjunction with standard moisture density relations. ...
  • Evaluation of WisDOT Quality Management Program Activities and Impacts on Pavement Performance Research Brief
    Evaluation of WisDOT Quality Management Program Activities and Impacts on Pavement Performance [Research Brief]
    Faheem, Ahmed
    2019-04-01 | PDF
    The Wisconsin Department of Transportation’s (WisDOT) Quality Management Program (QMP) accepts Hot Mix Asphalt (HMA) materials based on quality control testing during construction. There is a need to expand the use of this data to directly relate construction practices to measurable indicators of pavement performance, such as distress surveys. This ...
  • A Mechanistic Approach to Utilize Traffic Speed Deflectometer TSD Measurements into Backcalculation Analysis Tech Summary
    A Mechanistic Approach to Utilize Traffic Speed Deflectometer (TSD) Measurements into Backcalculation Analysis [Tech Summary]
    Elseifi, Mostafa A. ;
    Gaspard, Kevin
    2019-04-01 | PDF
    Backcalculation analysis of pavement layer moduli is typically conducted based on falling weight deflectometer (FWD) measurements; however, the stationary nature of FWD requires lane closure and traffic control. To overcome these limitations, a number of continuous deflection devices were introduced in recent years including the traffic speed defle ...
  • Investigation Into Shrinkage of HighPerformance Concrete Used for Iowa Bridge Decks and Overlays Phase II Shrinkage Control and Field Investigation
    Investigation Into Shrinkage of High-Performance Concrete Used for Iowa Bridge Decks and Overlays – Phase II Shrinkage Control and Field Investigation
    Wang, Kejin ;
    Ling, Yifeng
    2019-04-01 | PDF
    This Phase II research project on the shrinkage behavior of high-performance concrete (HPC) used in Iowa bridge decks and overlays evaluated several concrete mixes, building off or modifying mixes developed in Phase I. Based on shrinkage behavior and mechanical properties, the mixes studied in Phase I were characterized as having either high, mediu ...
  • Optimizing Technology for Collecting Arizona LongDistance Travel Data
    Optimizing Technology for Collecting Arizona Long-Distance Travel Data
    Hard, Edwin N. ;
    Chigoy, Byron T
    2019-04-01 | PDF
    This report provides an implementation plan and recommendations for developing long-distance travel data, defined as trips 50 miles or longer, for the Arizona Department of Transportation (ADOT) statewide travel demand model. The report evaluates origin-destination (O-D) data from cellular, global positioning system (GPS), Location Based Services ( ...
  • Integrated Analytics and Visualization for Multimodality Transportation Data
    Integrated Analytics and Visualization for Multi-modality Transportation Data
    Silva, Claudio T ;
    Freire, Juliana
    2019-04-01 | PDF
    Urban informatics is an important field that is attracting increasing attention from academia, government and industry. One particular area of interest in this field is in modeling movement of people and goods around cities. In this report the authors leverage a new data set composed of tens of millions of images from New York City captured over a ...
  • Noise Wall Overhang Design Factsheet
    Noise Wall Overhang Design [Factsheet]
    Sperry, Benjamin R. ;
    Staley, Blake
    2019-04-01 | PDF
    One potential option to achieve noise reduction at a lower cost is to add a roadway-side overhang component to the top of an existing or proposed noise wall. Broadly, a noise wall “overhang” modification is an additional structural element or fixture attached along the top edge of a traditional or “plain-top” noise wall. The acoustical benefit of a ...
  • Thermal Integrity Profiling for Detecting Flaws in Drilled Shafts Research Brief
    Thermal Integrity Profiling for Detecting Flaws in Drilled Shafts [Research Brief]
    Boeckmann, Andrew Z.
    ORCID ICON IMG
    2019-04-01 | PDF
    Thermal Integrity Profiling (TIP) measures the temperature of concrete along the length of drilled-shaft reinforcing cages to identify potential defects. The heat generated from hydration of cement within the drilled shaft is captured by wired sensors affixed to the cage and recorded by small data loggers at the ground surface. Areas of lower tempe ...
  • How can interdisciplinary teams leverage emerging technologies to respond to transportation infrastructure needs A mixedmethods evaluation of civil engineers urban planning and social workers perspectives
    How can interdisciplinary teams leverage emerging technologies to respond to transportation infrastructure needs? A mixed-methods evaluation of civil engineers, urban planning, and social workers’ perspectives
    Fields, Noelle ;
    Cronley, Courtney
    2019-04-01 | PDF
    This study explored how engineers, planners, and social workers interact around issues of transportation and transportation equity, and identified opportunities for enhanced collaboration and training in anticipation of emerging transportation needs for environmental justice (EJ) populations. This study provided the foundation for future educationa ...
  • DataDriven Pavement Maintenance and Rehabilitation Strategies for GDOTs New State Route Prioritization Policy
    Data-Driven Pavement Maintenance and Rehabilitation Strategies for GDOT’s New State Route Prioritization Policy
    Tsai, James (Yichang) ;
    Wang, Zhaohua
    2019-04-01 | PDF
    The Georgia Department of Transportation (GDOT) has used the models and application that were developed through the RP 05-19 to justify and forecast the network-level, long-term pavement performance, and Maintenance, Rehabilitation, and Reconstruction (MR&R) need to the legislature. However, the Markov-chain-based pavement deterioration transition ...
  • Analytical Investigations and Design Implications of Seismic Response of a TwoSpan ABC Bridge System
    Analytical Investigations and Design Implications of Seismic Response of a Two-Span ABC Bridge System
    Shoushtari, Elmira ;
    Saiidi, Mehdi Saiid
    2019-04-01 | PDF
    Despite the numerous advantages that accelerated bridge construction (ABC) offers, it has not been embraced in moderate and high seismic areas. This is due to insufficient research data investigating the effect of interaction between ABC connections and prefabricated components, guidelines for their seismic design, as well as the reliable analytica ...
  • TenYear Assessment of Virginias First Warm Mix Asphalt Sites
    Ten-Year Assessment of Virginia's First Warm Mix Asphalt Sites
    Diefenderfer, Stacey D
    2019-04-01 | PDF
    VDOT’s initial warm mix asphalt (WMA) trials were constructed in 2006 and assessed the Sasobit additive and Evotherm DAT technology as compared to a control hot mix asphalt (HMA). The overlays on the sites have been assessed at regular intervals over the course of their lifespan, offering an opportunity to evaluate the long-term performance of thes ...
  • Noise Wall Overhang Design
    Noise Wall Overhang Design
    Sperry, Benjamin R. ;
    Staley, Blake
    2019-04-01 | PDF
    The purpose of this research study was to determine if a roadway-side overhang component could provide meaningful noise reduction and air quality benefits for ODOT's noise walls in a manner that is cost-effective and meets all of ODOT’s structural design requirements. A comprehensive review of literature was conducted to identify past research on o ...
  • Analysis of Performance Measures of Traffic Incident Management in Utah
    Analysis of Performance Measures of Traffic Incident Management in Utah
    Schultz, Grant G. ;
    Saito, Mitsuru
    2019-04-01 | PDF
    In 2009 the Federal Highway Administration published a report regarding a Focus States Initiative that had been conducted with 11 states to discuss the development of national Traffic Incident Management (TIM) standards. Performance measures were defined, and a national TIM dashboard created, but very little data has been added to the dashboard sin ...
  • Western Slope Wildlife Prioritization Study
    Western Slope Wildlife Prioritization Study
    Kintsch, Julia ;
    Basting, Pat
    2019-04-01 | PDF
    The Western Slope Wildlife Prioritization Study (WSWPS) emerged from a commitment to increased collaboration between CDOT and Colorado Parks and Wildlife (CPW) to address wildlife conflicts on roads. The study’s objective involved identifying wildlife-highway conflict areas where targeted mitigation could have the greatest impact on reducing WVCs. ...
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