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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 1661 - 1680 of 35478 results
  • 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 ...
  • Best Practices for Improving Subgrade Drainage
    Best Practices for Improving Subgrade Drainage
    Johnson-Kaiser, Thomas ;
    Bekele, Marcus
    2023-06-01 | PDF
    This project developed a high-level best practices guidance document for the design/installation of subsurface drainage. This Tool serves as a guide to assist agencies in understanding drainage problems and options to consider for mitigating structural damage to pavements due to moisture. The weather and soil conditions vary drastically across Minn ...
  • Designing and Implementing Maintainable Pedestrian Safety Countermeasures
    Designing and Implementing Maintainable Pedestrian Safety Countermeasures
    Veneziano, David ;
    Wood, Jonathan
    2023-06-01 | PDF
    While pedestrian safety countermeasures contribute to reducing vehicle-pedestrian crashes, their impacts on winter maintenance operations are sometimes overlooked during design. There is a need to investigate the best practice guidance and solutions for the design, installation and maintenance of pedestrian safety features for year-round maintenanc ...
  • Comparing the CostEffectiveness of Asphalt Binders for Local Roads
    Comparing the Cost-Effectiveness of Asphalt Binders for Local Roads
    Marasteanu, Mihai
    2023-06-01 | PDF
    Polymer-modified binders (PMB) have been shown over the decades to improve the mechanical properties of asphalt mixtures compared to unmodified binders. Considering its higher initial cost, selecting the best alternative is very important, especially for local agencies, given their limited budgets. A challenge in the materials selection process for ...
  • Maximizing Transportation Assets by Building Community Connection through Innovative Deployment of Rights of Way and Airspace
    Maximizing Transportation Assets by Building Community Connection through Innovative Deployment of Rights of Way and Airspace
    Douma, Frank ;
    Sheikh, Maya
    2023-06-01 | PDF
    This Minnesota Department of Transportation-sponsored research effort examined innovative right-of-way projects nationwide, focusing on how new and innovative practices for redeveloping transportation assets can meet ambitious goals such as mitigating environmental impacts, encouraging placemaking, and enhancing economic opportunity while continuin ...
    Supporting Files
  • Uncrewed Aircraft Systems Technology Airspace Design Privacy and Safety in Idaho
    Uncrewed Aircraft Systems Technology, Airspace Design, Privacy and Safety in Idaho
    Totoricagüena, Gloria
    2023-06-01 | PDF
    This report examines existing guidelines in Idaho and in other states that lead in the implementation of UAS, in order to identify strategies to promote and regulate their use in Idaho’s airspace from the surface to 400 feet AGL. UAS innovations accelerate project delivery, increase roadway safety, reduce congestion, and improve environmental susta ...
  • Identifying and Optimizing Electric Vehicle Corridor Charging Infrastructure for Medium and HeavyDuty Trucks
    Identifying and Optimizing Electric Vehicle Corridor Charging Infrastructure for Medium and Heavy-Duty Trucks
    Khani, Alireza ;
    Emami, Behnam Davazdah
    2023-06-01 | PDF
    This project studies the benefits and barriers of increased adoption of medium-duty and heavy-duty electric trucks, referred to as e-trucks, and presents a methodology for optimizing the location of e-truck charging stations in Minnesota. In general, e-trucks provide zero tailpipe emissions and lower operating and maintenance costs. However, some b ...
  • Assessment of Pipe Fill Heights
    Assessment of Pipe Fill Heights
    Urrego, Luz María Agudelo ;
    Savigamin, Chatuphat
    2023-06-01 | PDF
    The design of buried pipes, in terms of the allowable minimum and maximum cover heights, requires the use of both geotechnical and structural design procedures. The geotechnical procedure focuses on estimating the load on the pipe and the compressibility of the foundation soil. The focus of the structural design is choosing the correct cross-sectio ...
  • Evaluate the Impacts of Complete Streets Policy in Louisiana
    Evaluate the Impacts of Complete Streets Policy in Louisiana
    Bian, Ruijie “Rebecca” ;
    Tolford, Tara
    2023-06-01 | PDF
    The goal of Complete Streets is to accommodate all road users and bring attention to the needs of vulnerable road users. In the last 10 years, thousands of local/regional/state agencies in the United States (U.S.) have adopted Complete Streets policies. However, it is not clear how successfully these policies have been implemented and to what exten ...
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