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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 6741 - 6760 of 36104 results
  • Improving the Quality of Bridge Inspections Using Unmanned Aircraft Systems UAS
    Improving the Quality of Bridge Inspections Using Unmanned Aircraft Systems (UAS)
    Wells, Jennifer ;
    Lovelace, Barritt
    2018-07-01 | PDF
    Bridges are a key part of the transportation system and maintaining this infrastructure is important to ensure the safety of the traveling public and to effectively manage these valuable assets. Safety inspections not only ensure the structural integrity of a bridge but provide valuable data to decision makers. The Minnesota Department of Transport ...
  • Impact of WaterCementitiousBased Concrete Mix Design Specification Changes on Concrete Pavement Quality
    Impact of Water/Cementitious-Based Concrete Mix Design Specification Changes on Concrete Pavement Quality
    Sutter, Lawrence ;
    Moulzolf, Gerard
    2018-07-01 | PDF
    This research investigated the impact of MnDOT implementing a w/cm-based specification for concrete pavements. Pavement sections constructed before and after the specification implementation were examined to assess permeability, compressive strength and air-void system parameters. Pavement management system data was examined to identify changes in ...
  • Driver Crash Causation Study by GenderMissouri Iowa and Illinois Comparison
    Driver Crash Causation Study by Gender—Missouri, Iowa, and Illinois Comparison
    Bernard Bracy, Jill M ;
    Mundy, Ray A.
    2018-07-01 | PDF
    Missouri, Iowa, and Illinois drivers often share each other’s roadways; therefore, it is important to examine similarities and differences in the causes of motor vehicle crashes among the three states. This is especially true in light of a recent National Highway Transportation Safety Administration (NHTSA) report stating that the monetary cost of ...
  • A Rational Method of Surface Treatment Selections for Concrete Decks
    A Rational Method of Surface Treatment Selections for Concrete Decks
    Vancura, Mary E.
    2018-07-01 | PDF
    Thin polymer overlays (TPOs) enhance the safety of bridge decks by increasing skid resistance, but they also act as barriers to chloride ingress. TPOs are often applied to concrete bridge decks before they are opened to traffic and have a 10-to 15-year service life. It was hypothesized that delaying the application of the TPO and allowing some chlo ...
  • Sloped and Mitered Concrete Headwalls
    Sloped and Mitered Concrete Headwalls
    Ashurst, Kean H. ;
    Rister, Brad W.
    2018-07-01 | PDF
    The Kentucky Transportation Cabinet (KYTC) currently uses several pipe culvert end treatments, including standard headwalls, slope and flared headwalls, sloped and parallel headwalls, and safety metal ends. These treatments, however, can pose a safety hazard to motorists and those performing landscaping work (e.g., mowing). Crash statistics from 20 ...
  • Draft Environmental Impact Statement for the Safer Affordable FuelEfficient SAFE Vehicles Rule for Model Year 20212026 Passenger Cars and Light Trucks
    Draft Environmental Impact Statement for the Safer Affordable Fuel-Efficient (SAFE) Vehicles Rule for Model Year 2021–2026 Passenger Cars and Light Trucks
    Katz, Kenneth ;
    Krupen, Russell
    2018-07-01 | PDF
    This Draft Environmental Impact Statement (EIS) analyzes the environmental impacts of fuel economy standards and reasonable alternative standards for model years 2021 to 2026 for passenger cars and light trucks. NHTSA has proposed these new or amended Corporate Average Fuel Economy (CAFE) standards under the Energy Policy and Conservation Act of 19 ...
    Supporting Files
  • Technologies for Integration of small Unmanned Aerial Systems sUAS in National Airspace System
    Technologies for Integration of small Unmanned Aerial Systems (s-UAS) in National Airspace System
    Dechering, Matthew ;
    Radmanesh, Mohammadreza
    2018-07-01 | PDF
    Small Unmanned Air Systems (s-UAS) have generated a lot of interest in recent years due to their potential to revolutionize applications in civilian domains. For the widespread use of s-UAS to become a reality for civilian applications, s-UAS must safely and reliably integrated into the National Airspace System (NAS). Because the technology in this ...
  • Warranty Utility Cut Repairs QCQA of Utility Cut Repairs
    Warranty Utility Cut Repairs (QC/QA of Utility Cut Repairs)
    Kumar, Srinath Shiv ;
    Abraham, Dulcy M.
    2018-07-01 | PDF
    Poor construction techniques in utility cut repairs often lead to settlement of the patches, increasing the roughness of the pavement and decreasing the rideability of the repaired pavement. Identifying the company responsible for faulty pavement repairs is difficult since multiple utilities may have performed repairs in the same section. The objec ...
  • Implementation of Aerial LiDAR Technology to Update Highway Feature Inventory Research Brief
    Implementation of Aerial LiDAR Technology to Update Highway Feature Inventory [Research Brief]
    Song, Ziqi ;
    He, Yi
    2018-07-01 | PDF
    Highway inventory data collection is a complicated and repetitive work that requires a lot of manpower and resources. The main goal of the project was to analyze and demonstrate the feasibility of the airborne LiDAR inventory technique for collecting and recording highway inventory data.
  • LongTerm Behavior of Precast Concrete Bridges
    Long-Term Behavior of Precast Concrete Bridges
    Powelson, Phillip ;
    Barr, Paul
    2018-07-01 | PDF
    For this research, sensors were used to investigate the differences in prestress losses and temperature gradients in a concrete deck bulb tee girder bridge. The Millville Bridge was built as an access point to the Ridgeline High School in Millville, Utah. The bridge was built in 2016 and presently supports two lanes of traffic. Changes in prestress ...
  • EarlyAge FiberReinforced Concrete Properties for Overlays
    Early-Age Fiber-Reinforced Concrete Properties for Overlays
    Bordelon, Amanda ;
    Kim, Min Ook
    2018-07-01 | PDF
    This study aims to investigate the age-dependent changes in flexural and fracture properties of fiberreinforced concrete (FRC) used in the design of thin overlay pavements. Four different types of steel or polypropylene macro-fibers with different dimensions and different fiber volume contents (0%, 0.5%, and 1.0%) were selected and investigated. No ...
  • Visualization and Communication in Pavement Performance
    Visualization and Communication in Pavement Performance
    Corritore, Cindy ;
    Govindarajulu, Nalini
    2018-07-01 | PDF
    The purpose of this research project was to develop visualization techniques and methods that display pavement performance data and information in a communication-friendly format for a variety of end users. Several possible scenarios of end users and possible questions that they might use visual analyses to answer were envisioned. The researchers b ...
  • 2017 Illinois Department of Transportation Research Peer Exchange Summary Report
    2017 Illinois Department of Transportation Research Peer Exchange: Summary Report
    Texas A&M Transportation Institute  ...
    2018-07-01 | PDF
    The transportation research program at the Illinois Department of Transportation (IDOT) hosted a peer exchange to discuss program management practices, effective staffing, technology transfer, and increasing the utilization of the research program. The host state contributed to the funding of the Support Services for Peer Exchange Pooled Fund (TPF5 ...
  • Content Management Systems and Website Practices Transportation Research Synthesis
    Content Management Systems and Website Practices: Transportation Research Synthesis
    Foley, Michael ;
    Tran, Maina
    2018-07-01 | PDF
    The Minnesota Department of Transportation (MnDOT) Office of Communications is interested in gathering information about content management systems (CMS) used by other state departments of transportation. With more than 150 subsites within its main website, MnDOT is considering the adoption of a CMS to help increase the efficiency of its website ma ...
  • Accelerated Retrofit of Bridge Columns Using UHPC Shell Phase I Feasibility Study
    Accelerated Retrofit of Bridge Columns Using UHPC Shell – Phase I: Feasibility Study
    Azizinamini, Atorod ;
    Farzad, Mahsa
    2018-07-01 | PDF
    The properties of UHPC make it a suitable choice as the repair material for retrofitting the damaged body of the marine piles, and application of UHPC could provide an efficient solution to address the pressing issue of bridge rehabilitation. However, there have been very limited studies investigating the feasibility of using this material to repai ...
  • Use of Small Unmanned Aerial Vehicles sUAV for Structural Inspection
    Use of Small Unmanned Aerial Vehicles (sUAV) for Structural Inspection
    Bridge, Jennifer
    2018-07-01 | PDF
    Traffic structures in Florida must be inspected regularly, every 2 years for bridges and every 5 years for high mast light poles. Bridges that are difficult to access, such as the Dames Point Bridge in Jacksonville or the Sunshine Skyway over Tampa Bay, often require special bridge inspection vehicles that have extension arms to position the inspec ...
    Supporting Files
  • Steering the Electric Vehicle Transition to Sustainability
    Steering the Electric Vehicle Transition to Sustainability
    Turrentine, Thomas ;
    Hardma, Scott
    2018-07-01 | PDF
    To achieve carbon reduction goals for 2040 and 2050, plug-in electric vehicle (PEV) policy must be worldwide and involve multi-decade policy programs. One policy is a broadening commitment to ending fossil fuels for light-duty vehicles; this will solidify the direction and accelerate investments in zero emission vehicles (ZEVs) and decapitalization ...
  • Visual Analysis of Pavement Performance and Related Factors
    Visual Analysis of Pavement Performance and Related Factors
    Corritore, Cindy ;
    Govindarajulu, Nalini
    2018-07-01 | PDF
    The purpose of this research project was to develop visualization techniques and methods that display pavement performance data and information in a communication-friendly format for a variety of end users. Several possible scenarios of end users and possible questions that they might use visual analyses to answer were envisioned. The researchers b ...
  • Intermodel Comparison Between Switch 20 and GE MAPS Evaluating a New Tool for Integrated Modeling of Electric Vehicles and HighRenewable Power Systems
    Intermodel Comparison Between Switch 2.0 and GE MAPS: Evaluating a New Tool for Integrated Modeling of Electric Vehicles and High-Renewable Power Systems
    Fripp, Matthias
    2018-07-01 | PDF
    Electric Vehicles (EVs) could help increase energy security and reduce greenhouse gas emissions by using electricity produced from clean, domestic sources instead of imported oil. This benefit could be enhanced if EVs are adopted in high-renewable power systems and are charged at the times when renewable power is most abundant, producing a win-win ...
  • SiteSpecific Data Will Improve Safety Decisions for Michigan Rural Roads Research Spotlight
    Site-Specific Data Will Improve Safety Decisions for Michigan Rural Roads: Research Spotlight
    Gates, Timothy
    2018-07-01 | PDF
    Nationwide, the fatal crash rate on rural roads is higher than on urban roads – 2.6 times higher in 2015. Rural road safety continues to be a top MDOT concern, but national models developed for safety assessment do not provide sufficiently accurate results when applied to Michigan’s rural roads. Researchers developed new, more accurate models for e ...
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