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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 1801 - 1820 of 35865 results
  • Mitigation of ChlorideInduced Corrosion through Chemisorption
    Mitigation of Chloride-Induced Corrosion through Chemisorption
    Yellavajjala, Ravi Kiran ;
    Sajid, Hizb Ullah
    2023-07-01 | PDF
    Salt brine deicing solution contains chloride ions that can penetrate the passive layer and cause corrosion in rebars. While epoxy coatings are effective, they can be easily damaged during transportation and construction. In addition, aggressive localized corrosion is observed in damaged epoxy coated rebars. To address this issue, this project aims ...
    Supporting Files
  • Use of Infrared Thermography for the Inspection of Welds in the Shop and Field Phase II
    Use of Infrared Thermography for the Inspection of Welds in the Shop and Field – Phase II
    Manuel, Michele
    2023-07-01 | PDF
    The research focused on demonstrating and implementing infrared thermography nondestructive technique (IR-TNDT) methods in-service for inspecting aluminum (Al) and steel welds in complex structures. The study was applied to in-shop and mock in-field conditions. After a thorough literature review, this report presents the qualification of defect man ...
  • Investigating Thermal Imaging Technologies and Unmanned Aerial Vehicles to Improve Bridge Inspections
    Investigating Thermal Imaging Technologies and Unmanned Aerial Vehicles to Improve Bridge Inspections
    Ahearn, Kevin ;
    Seston, Brady
    2023-06-30 | PDF
    The overall research objective is to focus on developing UAV-based inspection and analysis protocols using infrared (IR) thermal imaging to determine the existence and extent of concrete delamination, with emphasis on the underside of bridge decks. The research was implemented through 5 tasks: 1. Desk scan of infrared thermal imaging and unmanned a ...
  • Performance of UltraThin Bonded Wearing Course UTBWC During Winter Snow Ice Events in Maryland
    Performance of Ultra-Thin Bonded Wearing Course (UTBWC) During Winter Snow Ice Events in Maryland
    Goulias, Dimitrios ;
    Zhao, Yunpeng
    2023-06-30 | PDF
    Ultra-Thin Bonded Wearing Course (UTBWC) pavement surfacing was developed as a preventative maintenance option to extend pavement life. Despite the successful applications of UTBWC in various states, feedback from winter maintenance crews indicates icing accumulation on some UTBWC surfaces in Maryland during winter storms, and thus current salting ...
  • Technology of Mapping and NDT for Pipes Inspection
    Technology of Mapping and NDT for Pipes Inspection
    Hamoush, Sameer ;
    Yi, Sun
    2023-06-30 | PDF
    This project aimed to implement the advances in new technologies to develop a robotic-based autonomous inspection system for underground pipelines. The new technology is based on the combination of intelligent powerful portable software and the newly advancement in mapping techniques. The system can scan and reconstruct the 3D profile of a pipeline ...
  • Behavioral Safety Project
    Behavioral Safety Project
    Guler, S Ilgin ;
    Gayah, Vikash V.
    2023-06-30 | PDF
    Careful data-driven analysis of these key focus areas is needed to provide guidance on the most cost-effective methods to improve safety performance from a behavioral perspective. The objective of this project was to develop a behavioral traffic safety-related data analysis report that identifies behavioral issues that may contribute to crashes and ...
  • Development of Advanced Landslide Investigation Protocol Using Geophysical Methods for Mississippi
    Development of Advanced Landslide Investigation Protocol Using Geophysical Methods for Mississippi
    Khan, Sadik ;
    Amini, Farshad
    2023-06-30 | PDF
    Slope failures frequently occur in highway embankments in Mississippi due to the existence of highly expansive Yazoo Clay. In addition, the Mississippi climate, especially the high volume of precipitation, plays a major role in the development of landslides. State Study 316 was undertaken to evaluate the landslides throughout the states employing A ...
  • Resiliency of Prestressed Concrete Beams Exposed to Fire
    Resiliency of Prestressed Concrete Beams Exposed to Fire
    Zhu, Zheda ;
    Quiel, Spencer E.
    2023-06-30 | PDF
    Numerical simulations were used to investigate the thermo-structural response of simple span prestressed bulb-T concrete bridge girders to fire hazards located underneath the bridge. The approach consists of three steps: (1) fire modeling, (2) heat transfer modeling, and (3) structural modeling. The effects of thermal concrete spalling are accounte ...
  • Innovation Tools and Concept Strategies for System Planning
    Innovation Tools and Concept Strategies for System Planning
    Chandra, Shailesh ;
    Balali, Vahid
    2023-06-29 | PDF
    Technology awareness, use, and application are required to realistically and accurately model strategies (and their performance measures) that define success in corridor planning. Performance measures derived from each implementable strategy through a project that improves mobility, safety, reliability, sustainability, and equity are helpful to pol ...
  • Investigating Concrete Deck Cracking in Continuous Steel Bridges
    Investigating Concrete Deck Cracking in Continuous Steel Bridges
    Heymsfield, Ernie. ;
    Murray, Cameron D.
    2023-06-29 | PDF
    Bridge deck cracking reduces serviceability and lifespan of bridges. Early age cracking can typically be attributed to either of two factors: 1) construction practices and 2) concrete shrinkage. The Arkansas Department of Transportation ARDOT has identified a disproportionate number of continuous steel girder bridges experiencing early age bridge d ...
  • Balsi Beam Implementation Research
    Balsi Beam Implementation Research
    Ravani, Bahram ;
    Delshad, Saeid
    2023-06-27 | PDF
    The Balsi Beam system was developed by Caltrans as a Mobile Work Zone Protection System for worker protection. The system is integrated as a self-contained tractor trailer system with telescoping beams which can be deployed to a work zone and adjusted in length without a need for a crane or any other equipment. There are, however, no guidelines for ...
  • Safety Evaluation of Alternatives for Installing Pedestrian Signals Under Side Street Green Operation
    Safety Evaluation of Alternatives for Installing Pedestrian Signals Under Side Street Green Operation
    Ivan, John N. ;
    Wang, Kai
    2023-06-14 | PDF
    The objective of this project was to carry out a safety evaluation of conversion of intersections owned by CTDOT operating under side street green pedestrian phasing to concurrent pedestrian phasing. Side street green phasing means that pedestrians cross the main road during the minor road green phase, and there is no special pedestrian phasing or ...
  • Implementation and Evaluation of Aira Access Pilot Run in Connecticut
    Implementation and Evaluation of Aira Access Pilot Run in Connecticut
    Shaon, Mohammad Razaur Rahman ;
    Shirani, Niloufar
    2023-06-14 | PDF
    The goal of this project is to implement Aira, one of the fastest-growing assistive technology options for people who are blind or have low vision, across the entire State of Connecticut, to be used for navigation, wayfinding, riding public transportation, and to ensure proper social distancing for blind-low vision (BLV) individuals. The University ...
  • WestWide Study To Identify Important Highway Locations for Wildlife Crossings
    West-Wide Study To Identify Important Highway Locations for Wildlife Crossings
    Paul, Kylie ;
    Faselt, Jamie
    2023-06-02 | PDF
    Wildlife-vehicle collisions (WVCs), reduced ecological connectivity, and associated impacts to wildlife and humans are widespread problems across road networks, but mitigation measures like wildlife crossings1 that can address those problems are often considered expensive. This effort aims to support transportation agencies, wildlife agencies and o ...
  • Measuring Transportation Research Benefits in Utah
    Measuring Transportation Research Benefits in Utah
    Anderson, Douglas I. ;
    Lindsey, Rukhsana
    2023-06-01 | PDF
    Research benefits information was compiled to estimate the effectiveness of UDOT’s research program. Project benefits were gathered through survey responses submitted by the end users of the project deliverables. Using project costs, an estimate of the benefit-cost ratio for the program was determined. This information gathered for 57 research proj ...
  • The Substance Abuse Professional Guidelines
    The Substance Abuse Professional Guidelines
    United States. Department of Transportation. Office of Drug and Alcohol Policy and Compliance
    2023-06-01 | PDF
    These Guidelines are provided to you by the U.S. Department of Transportation (DOT) Office of Drug and Alcohol Policy and Compliance (ODAPC). These Guidelines apply only to employers; individuals who are acting as a Substance Abuse Professional (SAP) for DOT- regulated employers; and employees subject to DOT regulation 49 CFR part 40 (Part 40) and ...
  • Designing Pedestrian Safety Features for YearRound Maintenance
    Designing Pedestrian Safety Features for Year-Round Maintenance
    Veneziano, David
    2023-06-01 | PDF
    Pedestrian fatalities make up almost 14% of traffic fatalities in Minnesota. While MnDOT continues to prioritize pedestrian safety, maintaining certain safety countermeasures can present challenges, particularly in winter. Keeping walkways, curb ramps, median refuge islands and other features safe requires keeping them free from snow and ice. Snowp ...
  • Using Rumble Strips to Encourage Stops at Rural Intersections
    Using Rumble Strips to Encourage Stops at Rural Intersections
    Hallmark, Shauna
    2023-06-01 | PDF
    Transverse rumble strips (TRS), which run across a traffic lane, are a low-cost and easily deployable safety countermeasure for intersection approaches. Grooved into the pavement or installed as ridges on the surface, rumble strips provide an audible and tactile warning to drivers and are effective in all conditions but particularly when it’s dark ...
  • Design and LifeCycle Assessment of Gabion Barriers for Rockfall Mitigation Using Numerical Modeling
    Design and Life-Cycle Assessment of Gabion Barriers for Rockfall Mitigation Using Numerical Modeling
    Knowles, Jeff ;
    Evans, T. Matthew
    2023-06-01 | PDF
    A Graphical User Interface (GUI) software is developed to perform numerical simulations in which gabion barriers are impacted by boulders of various geometries and initial momentum values. The results generated from this tool are used to develop design standards and life-cycle analysis procedures.
  • Impact of Production Variability on Balanced Mix Designs in Virginia
    Impact of Production Variability on Balanced Mix Designs in Virginia
    Bowers, Benjamin F. ;
    Lynn, Tiana
    2023-06-01 | PDF
    The objective of this study was to evaluate the influence of production variability on performance test results to determine if mixtures balanced during design could become unbalanced during production. Fourteen currently accepted mixture designs, 10 BMD mixtures and 4 Superpave mixtures (to serve as a comparison between current standards and BMD d ...
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