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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 5321 - 5340 of 36022 results
  • Research and Support to Implement Recommendations of the GDOT Small Business Program Evaluation
    Research and Support to Implement Recommendations of the GDOT Small Business Program Evaluation
    Boston, Thomas D. ;
    Ross, Catherine L.
    2019-10-01 | PDF
    This report is designed to assist the Georgia Department of Transportation (GDOT) in implementing the recommendations of a previous study, GDOT RP 13-29, “Task A: Evaluation of GDOT’s Small Business Program,” which concluded that the most effective way for GDOT’s Small Business Program (SBP) to level the playing field for small businesses is to imp ...
  • Improving Camber Predictions for Prestressed Concrete Girders Part 2 of 2
    Improving Camber Predictions for Prestressed Concrete Girders: Part 2 of 2
    Mante, David M ;
    Barnes, Robert W.
    2019-10-01 | PDF
    In precast, prestressed concrete construction, the eccentricity of the prestressing force typically results in a net upward girder deflection known as camber. Camber is first observed at the time of prestress transfer and tends to increase thereafter as a function of time-dependent material properties. While accurately predicted levels of camber ar ...
  • 2018 Assessment of the Practice of Public Involvement in Florida
    2018 Assessment of the Practice of Public Involvement in Florida
    Kramer, Jeff ;
    Tremblay, Nicole
    2019-10-01 | PDF
    This study was designed to document the current state of the practice of public involvement in transportation decision-making and provide an update to the 2006 report documenting public involvement in the state of Florida. A literature review was completed as the first phase. Surveys and interviews were then conducted with metropolitan planning org ...
  • Development of Statistical Models to Predict the Compressibility of Floridas Soils Summary
    Development of Statistical Models to Predict the Compressibility of Florida’s Soils [Summary]
    Nam, Boo Hyun
    2019-10-01 | PDF
    University of Central Florida researchers identified statistical models best suited for predicting compressibility parameters of Florida soils based on basic soil index parameters obtained during a geotechnical site investigation. For these models, they identified critical soil index properties to correlate compressibility parameters with laborator ...
  • Automated Identification and Quantification of Flexible and Rigid Pavement Distresses
    Automated Identification and Quantification of Flexible and Rigid Pavement Distresses
    Kargah-Ostadi, Nima ;
    Burchett, Thomas
    2019-10-01 | PDF
    This research project was conducted with the objective of evaluating the viability of using an automated computer application to detect, classify, and quantify cracks on flexible and rigid pavement surfaces from digital images, to be implemented in the annual Pavement Condition Survey (PCS). Phase I of this project was focused on identification and ...
  • Renewable Natural Gas Research Center Project
    Renewable Natural Gas Research Center Project
    Raju, Arun S.K. ;
    Roy, Partho Sarothi
    2019-10-01 | PDF
    Renewable Natural Gas (RNG) is an important alternative fuel that can help the State of California meet several greenhouse gas (GHG) reduction and renewable energy targets. Despite considerable potential, current RNG use on national and state levels are not significant. RNG production potential in California through thermochemical conversion was ev ...
  • Evaluation of Semicircular Bend Test for HMA Specialty Mixes Technical Brief
    Evaluation of Semi-circular Bend Test for HMA Specialty Mixes [Technical Brief]
    Bennert, Thomas
    2019-10-01 | PDF
    The purpose of this project was to research and evaluate the different variations (temperature, notch dimensions, load rates, etc.) of the Semi-Circular Bend (SCB) Flexibility Index (FI) test. This project was also aimed to develop a method of comparison of the fatigue performance results between the SCB FI and the Overlay Tester to help provide th ...
  • Field Demonstration of Tendon Imaging Method Summary
    Field Demonstration of Tendon Imaging Method [Summary]
    Alexander, Christopher ;
    Sagüés, Alberto A.
    2019-10-01 | PDF
    As part of a larger project (Project BDV25-977-24) to develop technology to inspect post-tensioning systems, University of South Florida researchers developed and field-tested a device that delivers and analyzes a cross-sectional image of a post-tensioning duct. The method and device are patented.
  • Development of Intelligent Vehicle Counting and Classification Sensor iVCCS
    Development of Intelligent Vehicle Counting and Classification Sensor (iVCCS)
    Muhammad, Siraj ;
    Refai, Hazem H.
    2019-10-01 | PDF
    The Internet of Things (IoT) is reshaping our world. Soon our lives will be based on smart technologies. According to IHS Markit forecasts, the number of connected devices will grow from 15.4 billion in 2015 to 30.7 billion in 2020. Forrester Research reports that fleet management and transportation sectors lead others in Io T growth. This may come ...
  • Improving Camber Predictions for Prestressed Concrete Girders Part 1 of 2
    Improving Camber Predictions for Prestressed Concrete Girders: Part 1 of 2
    Mante, David M ;
    Barnes, Robert W.
    2019-10-01 | PDF
    In precast, prestressed concrete construction, the eccentricity of the prestressing force typically results in a net upward girder deflection known as camber. Camber is first observed at the time of prestress transfer and tends to increase thereafter as a function of time-dependent material properties. While accurately predicted levels of camber ar ...
  • Evaluation of WBeam Guardrail Terminal Post in Sleeve
    Evaluation of W-Beam Guardrail Terminal Post in Sleeve
    Sheikh, Nauman M. ;
    Menges, Wanda L.
    2019-10-01 | PDF
    States with extreme winter weather are faced with difficulty in maintaining and repairing W-beam guardrail and end terminal posts installed in soil. Due to frozen soil conditions, posts installed directly in soil require more resources and equipment to repair and can delay repair of a damaged guardrail and/or end terminal. In addition, longer durat ...
  • Assessment of the Performance of Vehicular Traffic Signal Assemblies during Hurricane Force Winds Summary
    Assessment of the Performance of Vehicular Traffic Signal Assemblies during Hurricane Force Winds [Summary]
    Zisis, Ioannis
    2019-10-01 | PDF
    Florida International University researchers tested traffic signals in full-scale setups using realistic wind-loading.
  • Detection of Damage Precursors in Steel Components for LifeCycle Assessments
    Detection of Damage Precursors in Steel Components for Life-Cycle Assessments
    Hassiotis, Sophia ;
    Donskoy, Dimitri
    2019-10-01 | PDF
    The early identification of damage of fracture-critical members is of the outmost importance in the maintenance of a safe bridge infrastructure. A new Non-Destructive Evaluation method that gives an early warning of accumulating damage is been formulated herein. The Vibro-Acoustic Modulation method utilizes nonlinear interactions of a high frequenc ...
  • Assessment of the Richmond Districts Towing and Recovery Incentive Program Trip Pilot
    Assessment of the Richmond District’s Towing and Recovery Incentive Program (Trip) Pilot
    Dougald, Lance E ;
    Venkatanarayana, Ramkumar
    2019-10-01 | PDF
    On December 15, 2017, the Virginia Department of Transportation’s Richmond District began a towing and recovery incentive program (TRIP) pilot where tow companies receive a monetary bonus for clearing commercial vehicle crashes within 90 minutes. TRIP’s key objective is the facilitation of quick and safe clearance of commercial vehicle crashes thro ...
  • FloodFrequency Estimates for Ohio Streamgages Based on Data through Water Year 2015 and Techniques for Estimating FloodFrequency Characteristics of Rural Unregulated Ohio Streams
    Flood-Frequency Estimates for Ohio Streamgages Based on Data through Water Year 2015 and Techniques for Estimating Flood-Frequency Characteristics of Rural, Unregulated Ohio Streams
    Koltun, G.F.
    2019-10-01 | PDF
    The purpose of this report is to describe the results of a study to (1) estimate flood-frequency characteristics for selected streamgages in Ohio and adjacent states based on data collected through water year 2015; (2) develop and present techniques for estimating flood-frequency characteristics of rural, unregulated streams in Ohio; and (3) implem ...
  • Developing a Business Ecosystem Around Autonomous Vehicle Infrastructure in Indiana
    Developing a Business Ecosystem Around Autonomous Vehicle Infrastructure in Indiana
    Iyer, Ananth V ;
    Dunlop, Steven R
    2019-10-01 | PDF
    INDOT will soon be embarking on infrastructure planning to accommodate autonomous vehicles. This new technology affords the ability to impact economic value creation across the supply chain in Indiana, as well as foster economic development in Indiana to support these emerging technologies. This proposal will be a first cut towards exploring the de ...
  • Use of Laboratory Testing to Predict Premature Failures in Asphalt
    Use of Laboratory Testing to Predict Premature Failures in Asphalt
    Kusam, Abhilash ;
    Bacchi, Chris
    2019-10-01 | PDF
    In last few months, North Carolina Department of Transportation (NCDOT) has encountered recently paved sections exhibiting early distress throughout the state which is a major concern. NCDOT conducted an internal investigation on the causes of early distresses. And this investigation did not yield any conclusive results, hence; NCDOT recognized the ...
  • Assessing Increased Use of Reclaimed Asphalt Pavement in Asphalt Mixtures
    Assessing Increased Use of Reclaimed Asphalt Pavement in Asphalt Mixtures
    Nair, Harikrishnan ;
    Diefenderfer, Stacey D
    2019-10-01 | PDF
    In 2007, the Virginia Department of Transportation (VDOT) introduced specifications to allow asphalt surface mixtures to have up to 30% reclaimed asphalt pavement (RAP) without a change in the virgin binder grade. Since 2007, increasing material costs and a growing awareness of the quantity of RAP available for use have sparked interest in allowing ...
  • Development of Traffic Map Evaluation Tool for TMC Applications Summary
    Development of Traffic Map Evaluation Tool for TMC Applications [Summary]
    Stevanovic, Aleksandar
    2019-10-01 | PDF
    Florida Atlantic University researchers developed an online system, the Mapping Evaluation Tool (MET), that brings together traffic data from various sources and delivers it to traffic managers as a map.
  • Traffic Crash Variables in Wisconsin Research Brief
    Traffic Crash Variables in Wisconsin [Research Brief]
    Qin, Xiao
    2019-10-01 | PDF
    Traffic fatality and injury rates have steadily decreased since 1950 thanks to the collective impacts of law enforcement, driver education, highway engineering, emergency medical services and advancements in vehicle safety technologies. However, motor vehicle crashes are still a leading cause of death in Wisconsin.
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