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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 6061 - 6080 of 36049 results
  • Mechanical integrity and sustainability of prestressed concrete bridge girders repaired by epoxy injection Phase III
    Mechanical integrity and sustainability of prestressed concrete bridge girders repaired by epoxy injection - Phase III
    Arson, Chloe ;
    Stewart, L.K.
    2019-02-01 | PDF
    During pre-stress transfer, the bottom portion of steel-reinforced concrete girders is subjected to an important compression induced by the relaxation of tension in the bars, which opens longitudinal cracks along the horizontal axis. Reactions at the supports induce shear stress, which sometimes translates into additional diagonal cracks at the end ...
  • Improving Railroad Grade Crossing Safety Accurate Prediction of Train Arrival Times for Emergency Response Management and Driver Decision Support
    Improving Railroad Grade Crossing Safety: Accurate Prediction of Train Arrival Times for Emergency Response Management and Driver Decision Support
    Work, Daniel B. ;
    Wang, Ren
    2019-02-01 | PDF
    Incidents at highway-rail grade crossings, locations where railroad tracks intersect surface streets at grade, are a primary driver of safety in rail transportation in the United States. Addressing safety at these locations through technology is a focus of the Federal Railroad Administration and United States Department of Transportation. Effective ...
  • Chloride Diffusivity and Resistivity of Cured and Mature BinaryTernary Concrete Final Report
    Chloride Diffusivity and Resistivity of Cured and Mature Binary/Ternary Concrete [Final Report]
    Presuel-Moreno, Francisco J ;
    Kazemi, Amirkhosro
    2019-02-01 | PDF
    This investigation was performed to gain additional insight into the long-term durability of reinforced concrete structures. The chloride diffusion of concrete with supplementary cementitious materials is known to decrease with time, eventually reaching a stable value. This study aims to better understand when the chloride diffusion rate transition ...
  • Assessing Gazex Avalanche Control Effectiveness with Terrestrial Laser Scanning
    Assessing Gazex Avalanche Control Effectiveness with Terrestrial Laser Scanning
    Deems, Jeffrey S ;
    Gadomski, Peter J
    2019-02-01 | PDF
    This 2-year project used a ground-based laser scanner to map avalanche path snow depths to support an effectiveness assessment of recently-installed Gazex avalanche control systems in the Loveland Pass (Seven Sisters) and Berthoud Pass (Stanley) highway corridors. Scans were collected during snow-free conditions for a baseline, and then prior to an ...
  • Use of Nevadas Natural Pozzolans to Mitigate AlkaliSilica Reactivity
    Use of Nevada’s Natural Pozzolans to Mitigate Alkali-Silica Reactivity
    Ghafoori, Nader ;
    Kian, Arash
    2019-02-01 | PDF
    Alkali-silica reactivity is one of the most recognized deleterious phenomena in Portland cement concrete resulting in cracks, spalling, and other deleterious mechanisms. The aim of this study was (i) to assess the extent of reactivity of the aggregates, quarried from seven different sources, suspected of being conducive to ASR, and (ii) to compare ...
  • Successes in Stewardship CEDAR Helps States Increase Process Efficiencies in Project Development to Improve Environmental Compliance
    Successes in Stewardship - CEDAR Helps States Increase Process Efficiencies in Project Development to Improve Environmental Compliance
    United States. Federal Highway Administration
    2019-02-01 | PDF
    Successes in Stewardship is a Federal Highway Administration (FHWA) bimonthly newsletter highlighting current best practices in stewardship and environmental review from around the country.
  • Domestic Airline Fares Consumer Report Third Quarter 2018 Passenger and Fare Information
    Domestic Airline Fares Consumer Report: Third Quarter 2018 Passenger and Fare Information
    United States. Department of Transportation
    2019-02-01 | 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 ...
  • A Guide to Transportation Funding Options Available to Virginia Jurisdictions
    A Guide to Transportation Funding Options Available to Virginia Jurisdictions
    Moruza, Audrey K
    2019-02-01 | PDF
    This report provides a comprehensive summary of practices in Virginia jurisdictions for the purpose of raising local revenue for transportation purposes. To the extent possible, every current practice was located in the Code of Virginia to enable tracking of developments in the statutes and permissions referenced in the report. Transportation distr ...
  • PostInstallation Evaluation of the Effects of Ramp Metering in North Carolina
    Post‐Installation Evaluation of the Effects of Ramp Metering in North Carolina
    Davis, Joy ;
    Chase, Thomas
    2019-02-01 | PDF
    Since September 2017, the first four on‐ramp signals in North Carolina, positioned on the westbound lanes of I‐540 in Wake County, have been regularly activated Monday to Friday from 6:30 ‐ 9am. This report focused on the impact of these on‐ramp signals. The results identified are the product of data collected in the I‐540 WB area over multiple yea ...
  • Mechanical Bar Splices for Accelerated Construction of Bridge Columns
    Mechanical Bar Splices for Accelerated Construction of Bridge Columns
    Dahal, Puskar ;
    Tazarv, Mostafa
    2019-02-01 | PDF
    Compared with conventional lap splicing, mechanical splicing is an alternative method of connecting bars in reinforced concrete (RC) structures, and is used mainly to reduce bar congestion in joints. Recently, mechanical bar splices, which are also referred to as bar couplers, have been used in laboratories as a new type of precast column connectio ...
  • Comparison of Fresh Concrete Air Content Test Methods Analysis of Hardened Air Content in Wisconsin Pavements
    Comparison of Fresh Concrete Air Content Test Methods & Analysis of Hardened Air Content in Wisconsin Pavements
    Pham, Le T. ;
    Cramer, Steven M.
    2019-02-01 | PDF
    This research consisted of two phases: the first was a field study on the air void systems in Wisconsin pavements, and the second was a laboratory study to find the root causes of the problem identified in the field study. The first phase gathered sufficient measurements to verify the occurrence of disparities in air content measurements that had b ...
  • 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 ...
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