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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 6501 - 6520 of 36958 results
  • High Reclaimed Asphalt Pavement RAP Asphalt Mixes for Low Volume Roads Summary
    High Reclaimed Asphalt Pavement (RAP) Asphalt Mixes for Low Volume Roads [Summary]
    Arambula-Mercado, Edith
    ORCID ICON IMG
    2019-02-01 | PDF
    Road maintenance and rehabilitation activities by the Florida Department of Transportation (FDOT) generate about 1.8 million tons of reclaimed asphalt pavement (RAP) every year. Disposing of this material safely and productively is a continuing challenge. FDOT already uses RAP in some resurfacing projects, based on the results of previous research ...
  • IllinoisSpecific LRFR LiveLoad Factors Based on Truck Data
    Illinois-Specific LRFR Live-Load Factors Based on Truck Data
    Fu, Gongkang ;
    Wang, Qing
    2019-02-01 | PDF
    This research project has a focus on the load and resistance factored rating (LRFR) live-load factors for load rating bridges in Illinois. The study’s objectives were to examine the adequacy of available Illinois weigh-in-motion (WIM) data and to develop refined live-load factors for Illinois LRFR practice, based on recorded truck loads in Illinois ...
  • Mechanical Bar Splices for Accelerated Construction of Bridge Columns Research Brief
    Mechanical Bar Splices for Accelerated Construction of Bridge Columns [Research Brief]
    Tazarv, Mostafa ;
    Wehbe, Nadim I.
    2019-02-01 | PDF
    Couplers are not allowed to be used in bridge column plastic hinges in high seismic regions. This prevents their use as a precast column connection. This ban is because of a lack of systematic test data on the coupler performance, limited experimental studies on mechanically spliced columns, and engineering precautions.
  • Texas MechanisticEmpirical Flexible Pavement Design and Analysis System TxME Instructor Guide
    Texas Mechanistic-Empirical Flexible Pavement Design and Analysis System (TxME) Instructor Guide
    Hu, Sheng ;
    Zhou, Fujie
    2019-02-01 | PDF
    The Texas Mechanistic-Empirical Flexible Pavement Design and Analysis System (TxME) course is a half day course intended to provide advanced, in-depth, hands-on understanding of a new flexible pavement design and performance analysis system. The course is designed to cover: Mechanistic-Empirical design concept, Full view of TxME, Features of TxME, ...
  • Using Simulation to Assess Conflicts Between Bicyclists and RightTurning Vehicles
    Using Simulation to Assess Conflicts Between Bicyclists and Right-Turning Vehicles
    Christofa, Eleni ;
    Knodler Jr., Michael A.
    2019-02-01 | PDF
    Protected bike lanes, or cycle tracks, are increasing in popularity across the nation. However, despite the documented benefits of protected bike lanes, including safer cycling and increased ridership among differing populations of bicyclists, there remain ongoing concerns about potential conflicts between bicycles and vehicles when they merge back ...
  • Evaluation of Audible Lane Departure Warning Treatments for Seal Coat Road Surfaces
    Evaluation of Audible Lane Departure Warning Treatments for Seal Coat Road Surfaces
    Pike, Adam M. ;
    Wilson, Bryan
    2019-02-01 | PDF
    In an effort to reduce the number of single vehicle run-off-road and two-lane two-way crossover crashes, Texas Department of Transportation (TxDOT) has implemented various audible lane departure warning systems on seal coat road surfaces. This 20-month research project explored the effectiveness of these various treatments using several performance ...
  • Implementation of the HMA Shear Test for Routine MixDesign and Screening Technical Report
    Implementation of the HMA Shear Test for Routine Mix-Design and Screening: Technical Report
    Walubita, Lubinda F. ;
    Nyamuhokya, Tito
    2019-02-01 | PDF
    Rutting and permanent deformation (PD) continues to be a flexible pavement failure mode of concern, particularly under heavy traffic loading, high-temperature environments, and severe shear stress conditions such as highway intersections and urban stop-go sections, or where lower asphalt-binder performance grades (PGs) have been used. With the reco ...
  • The Future of Mobility Series
    The Future of Mobility Series
    Kaufman, Sarah M.
    ORCID ICON IMG
    2019-02-01 | PDF
    The Future of Mobility series highlighted emerging technologies in urban mobility and priorities for transportation industry change. The transportation landscape is rapidly changing as technology companies introduce new services to address existing transportation issues and innovate new mobility options. With its unique geography, high population d ...
  • Assessing Pedestrians Perceptions and Willingness to Interact with Autonomous Vehicles
    Assessing Pedestrians’ Perceptions and Willingness to Interact with Autonomous Vehicles
    Winter, Scott R ;
    Rice, Stephen
    2019-02-01 | PDF
    Autonomous vehicles are proposed as a way to make driving safer. While much research focuses on the technological and engineering aspects of autonomous vehicles, the purpose of these studies were to 1) determine differences in pedestrians’ willingness to cross the street in front of autonomous vehicles based on nationality and gender, 2) determine ...
  • Analyzing Various Data Sources and Evaluating Effectiveness of Providing Travel Time for NonFreeways Phase 1
    Analyzing Various Data Sources and Evaluating Effectiveness of Providing Travel Time for Non-Freeways – Phase 1
    Ma, Jiaqi ;
    Wei, Heng
    2019-02-01 | PDF
    The Ohio Department of Transportation (ODOT) is placing an emphasis on Transportation System Management and Operations (TSMO) as ODOT strives to find innovative ways to fulfill the mission to enhance capacity and improve safety. The current critical success factors already reflect this emphasis by addressing Travel Time Performance. ODOT provides t ...
  • Effects of TopofRail Friction Modifiers on the Friction Wear and Cracks of Railway Rails
    Effects of Top-of-Rail Friction Modifiers on the Friction, Wear and Cracks of Railway Rails
    Khan, Saad Ahmed
    2019-02-01 | PDF
    The railway is an economical and environmentally friendly mode of transport for long distances and heavy loads. The demands on the operators are increasing with increased competition in the market, and therefore they are currently demanding more track capacity. In the short term, the existing network is expected to deliver the increased capacity. I ...
  • Development of Safety Performance Functions for Network Screening of Roadway Departure Crashes in Virginia
    Development of Safety Performance Functions for Network Screening of Roadway Departure Crashes in Virginia
    Kweon, Young-Jun ;
    Lim, In-Kyu
    2019-02-01 | PDF
    Roadway departure (RD) is recognized as one of the eight emphasis areas in the Virginia 2017-2021 Strategic Highway Safety Plan (SHSP), and the Virginia Department of Transportation (VDOT) currently uses counts of RD crashes to identify locations for RD safety improvement. However, identifying locations based on crash counts is subject to bias and ...
  • Investigation and Evaluation of Iowa Department of Transportation Bridge Deck Epoxy Injection Process
    Investigation and Evaluation of Iowa Department of Transportation Bridge Deck Epoxy Injection Process
    Wipf, Terry J. ;
    Phares, Brent
    2019-02-01 | PDF
    Since the 1970s, the Iowa Department of Transportation (DOT) has used concrete overlays as a means of restoring its bridge decks and, as a result, the service life of the deck is commonly extended many years. This procedure has proven to be both effective and economically attractive. Despite that, concrete overlays cannot be considered a permanent ...
  • Economic Development Impact of Preservation Projects Summary
    Economic Development Impact of Preservation Projects [Summary]
    Gkritza, Konstantina ;
    Fricker, Jon D.
    2019-02-01 | PDF
    Preservation and maintenance activities protect pavements and bridges, extending the life of these assets and guaranteeing the safety of users. While preservation and maintenance work have significant overlap, some key differences exist. Preservation is work that is planned and performed to improve or keep a facility in a state of good repair. Usua ...
  • Advancing Transportation Equity Research and Practice
    Advancing Transportation Equity: Research and Practice
    Fan, Yingling ;
    Guthrie, Andrew
    2019-02-01 | PDF
    Transportation contributes to many societal outcomes, including employment, health, and wealth. However, disparities and inequities in transportation systems, services, and decision-making processes disproportionately impact underserved and underrepresented communities. This study seeks to create a better understanding of current research and pract ...
  • AID Project Summary Report for Intelligent Compaction
    AID Project Summary Report for Intelligent Compaction
    Hunsucker, David Q. ;
    Ashurst, Kean H.
    2019-02-01 | PDF
    This study reviews data from five roadway construction projects on which intelligent compaction (IC) techniques were used to achieve the more uniform compaction of road-building materials. Kentucky Transportation Center (KTC) researchers looked at IC data collected from these projects — resulting in the production of eight analyzable data sets — to ...
  • Distracted Driving Strategies and State of the Practices
    Distracted Driving: Strategies and State of the Practices
    Mitran, Elisabeta ;
    Ellender, Tess
    2019-02-01 | PDF
    This technical assistance report conducted an extensive literature review to obtain the state of knowledge on existing research on distracted driving in the US. The objective of this report was to review relevant studies on distracted driving including measurements, strategies, legislation, employer policies, and technologies used nationally to pre ...
  • Connected Vehicle Pilot Deployment Program Phase I Partnership Status Summary Tampa THEA Final Report
    Connected Vehicle Pilot Deployment Program Phase I: Partnership Status Summary: Tampa (THEA) [Final Report]
    Krueger, Gregory D. ;
    Johnson, Steven
    2019-02-01 | PDF
    The Tampa Hillsborough Expressway Authority (THEA) Connected Vehicle (CV) Pilot Deployment Program is developing a suite of CV applications, or apps, that utilize vehicle-to-infrastructure (V2I), vehicle-to-vehicle (V2V) and Vehicle to everything (V2X) communication technology to reduce traffic congestion, improve safety, and decrease emissions. Th ...
  • CostEffectiveness of Constructing Minimal Shelter to Store INDOT Equipment Weather Protection
    Cost-Effectiveness of Constructing Minimal Shelter to Store INDOT Equipment (Weather Protection)
    Iyer, Ananth V ;
    Dunlop, Steven R
    2019-02-01 | PDF
    Currently vehicles used by Indiana Department of Transportation (INDOT) are more likely to be subject to maintenance and repair than to replacement. The extent of wear and tear on the vehicles is likely to be impacted by the lack of covered storage in all districts. There are many different levels of covered storage—from tent-like structures to com ...
  • Understanding Ridership Trends in Transit
    Understanding Ridership Trends in Transit
    Polzin, Steven E. ;
    Godfrey, Jodi
    2019-02-01 | PDF
    Florida has seen dramatic ridership declines in the past four years. These declines are over two times more severe than those for the nation and have continued thru 2018. The declines are pervasive with the most severe declines in southeastern Florida locations, which are the most conducive to transit. The changes in ridership on public transportat ...
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