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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 2001 - 2020 of 36114 results
  • Expanding the NCDOTs Current Risk Management Program
    Expanding the NCDOT’s Current Risk Management Program
    Jaselskis, Edward J. ;
    Gholami, Sina
    2023-05-31 | PDF
    Enhancing the risk management program within the North Carolina Department of Transportation (NCDOT) is the focus of this collaborative research project with North Carolina State University (NCSU). The objective is to provide valuable insights and best practices to strengthen the NCDOT's Value Management Office (VMO) and implement an effective risk ...
  • Development of NonFracture Critical Steel Box Straddle Caps Project Summary Report
    Development of Non-Fracture Critical Steel Box Straddle Caps [Project Summary Report]
    Helwig, Todd ;
    Zecchin, Esteban
    2023-05-31 | PDF
    The research study included full-scale experimental testing and parametric finite element (FE) analyses, which resulted in a proposed methodology to estimate the flexural resistance of steel box caps following a potential fracture event. The work was conducted at the Ferguson Structural Engineering Laboratory at The University of Texas at Austin. T ...
  • Developing a Safe System Approach to Setting Speed Limits
    Developing a Safe System Approach to Setting Speed Limits
    Griswold, Julia B ;
    Lutzker, Liza
    2023-05-31 | PDF
    Over the last decade in California there has been a surge in the number of traffic fatalities, with especially large increases in pedestrian fatalities. At the same time, the California Department of Transportation (Caltrans) has affirmed a vision of reaching zero fatalities and serious injuries on state highways by 2050 and has committed the depar ...
  • Inventory Operations and Safety at Free RightTurn Ramps
    Inventory, Operations, and Safety at Free Right-Turn Ramps
    Khattak, Aemal J. ;
    Camenzind, Jonathon
    2023-05-31 | PDF
    This research focused on traffic safety and operational performance of rural, minor approach stop-controlled intersections with free right-turn (FRT) ramps. The objectives of the research were to: • Create a statewide inventory of rural FRT ramp intersections and provide to the Nebraska Department of Transportation (NDOT), • Using NDOT 10-year cras ...
  • Nebraska Balanced Mix Design Phase I
    Nebraska Balanced Mix Design – Phase I
    Yazdipanah, Farzad ;
    Khedmati, Mahdieh
    2023-05-31 | PDF
    Balanced mix design (BMD) is an alternative concept for designing asphalt mixtures that mainly focuses on performance of mixtures rather than only volumetric analysis. Using this concept, it would be possible to account for the incorporation of recycled asphalt mixtures, warm technology, polymers, rejuvenators, and other foreign additives, as well ...
  • ALTRIOS Advanced Locomotive Technology and Rail Infrastructure Optimization System
    ALTRIOS - Advanced Locomotive Technology and Rail Infrastructure Optimization System
    National Renewable Energy Laboratory (NREL) (U.S.)  ...
    2023-05-17 | PDF
    The Advanced Locomotive Technology and Rail Infrastructure Optimization System (ALTRIOS) is an open-source modeling framework developed to evaluate strategies for decarbonizing freight rail transportation. Introduced at the 2023 FRA Workshop on Decarbonization of Rail Transportation, ALTRIOS simulates train dynamics, powertrain performance, energy ...
  • Greenhouse Gas Emissions Inventory from Construction of Washington State Department of Transportation Roadways Final Report
    Greenhouse Gas Emissions Inventory from Construction of Washington State Department of Transportation Roadways: Final Report
    Ashtiani, Milad ;
    Lewis, Meghan
    2023-05-16 | PDF
    Recent emphasis on actions to reduce large-scale greenhouse gas (GHG) emissions has pushed most state departments of transportation (DOTs) to develop carbon accounting practices compatible with their current standard data collection and storage practices. In particular, with the recently passed Buy Clean Acts in California, Colorado, and Oregon and ...
  • Evaluate Geophysical Methods to Detect Underground Voids Project Summary
    Evaluate Geophysical Methods to Detect Underground Voids [Project Summary]
    Kallivokas, Loukas ;
    Cai, Mingwei
    2023-05-05 | PDF
    The primary objective of the project is to lend clarity on the applicability and limitations of each one of the four geophysical methods, while also arriving at recommendations for the most appropriate course of action when faced with site investigations aimed at detecting the presence of voids.
  • Assessing Axial Capacities of Auger Cast Piles from Measuring While Drilling Summary
    Assessing Axial Capacities of Auger Cast Piles from Measuring While Drilling [Summary]
    Herrera, Rodrigo ;
    Rodgers, Michael
    2023-05-01 | PDF
    Developing a comprehensive subsurface profile can be difficult, especially in certain areas in Florida where sandy soils with varying amounts of fines, clay, muck/peat and vuggy limestone formations add to the uncertainty of the overall response that can be expected from drilled-in-place deep foundations. Measuring while drilling (MWD) was develope ...
  • Pedestrian Traffic Signal Violations Safety Design and Operational Implications
    Pedestrian Traffic Signal Violations: Safety, Design, and Operational Implications
    Singleton, Patrick A. ;
    Mekker, Michelle
    2023-05-01 | PDF
    The objective of this research project is to improve pedestrian safety at signalized intersections by focusing on pedestrian signal violations: measuring behaviors, associating characteristics and locations, and identifying potential mitigation strategies. In this project, we recorded videos and collected and analyzed observational data on pedestri ...
  • Connected VehicleCentric Dashboards for TMC of the Future
    Connected Vehicle-Centric Dashboards for TMC of the Future
    Sakhare, Rahul Suryakant ;
    Desai, Jairaj
    2023-05-01 | PDF
    The adoption of dashboards and tools into Traffic Management Centers (TMC) has been growing with advancements in connected vehicle (CV) data. These tools are now being utilized—not only for analyzing work zones, severe crashes, winter operations, and traffic signals—but also to provide measures for characterizing overall system mobility, resiliency ...
  • Optimized HotMix Asphalt Lift Configuration for Performance
    Optimized Hot-Mix Asphalt Lift Configuration for Performance
    Al-Qadi, Imad L ;
    Ramakrishnan, Aravind
    2023-05-01 | PDF
    Researchers conducted eight large-scale laboratory tests to assess the combined impact of hot-mix asphalt (HMA) overlay mix and thickness on its performance to control reflective cracking. Bonding efficiency, flexibility, and stiffness of the HMA mix as well as overlay thickness significantly affect an overlay’s performance against reflective crack ...
  • Traffic Safety Toolbox Addressing Speeds
    Traffic Safety Toolbox – Addressing Speeds
    Sullivan, James L. ;
    Rowangould, Dana
    2023-05-01 | PDF
    Reducing speeding and aggressive driving is one of seven critical emphasis areas identified in the Vermont Highway Safety Plan, which targets reductions in major crashes on Vermont highways. Vermont towns recognize the need to discourage speeding and implement countermeasures that will bring speeds down to posted speed limits, especially in transit ...
  • Evaluating Metrics and Performance to Advance Transportation Equity
    Evaluating Metrics and Performance to Advance Transportation Equity
    Elgart, Zachary
    ORCID ICON IMG
    2023-05-01 | PDF
    MnDOT operates under an Equity Lens Framework, which, in addition to supporting the core agency values of accountability as well as diversity and inclusion, emphasizes underrepresented groups to achieve equitable outcomes. Measures and methods to evaluate transportation program equity impacts, however, have generally been lacking. To assess both sy ...
  • Performance of High EarlyStrength Materials Used in Concrete Bridge Repair
    Performance of High Early-Strength Materials Used in Concrete Bridge Repair
    Ebrahim, Zina ;
    Pozo-Lora, Fray F
    2023-05-01 | PDF
    High early-strength materials are widely used for rapid concrete patching projects to limit road closure time and traffic obstruction. This research investigated the field performance of multiple high early-strength materials used in maintenance projects across Nebraska. Data from high early-strength products included in the state’s approved produc ...
  • Understanding Transit and Shared Mobility Preferences PostCOVID
    Understanding Transit and Shared Mobility Preferences Post-COVID
    Fan, Yingling
    2023-05-01 | PDF
    Since the COVID-19 pandemic, the use of public transit and shared transportation services has plummeted, including in Greater Minnesota. Social distancing measures, general discomfort or safety concerns have resulted in a 40% reduction in trips throughout the state. Urban transit agencies have experienced a 55% reduction in revenue while smaller tr ...
  • Evaluation of RightofWay Fence Tags to Reduce AnimalVehicle Collisions
    Evaluation of Right-of-Way Fence Tags to Reduce Animal-Vehicle Collisions
    Gagnon, Jeffrey W. ;
    Beach, Colin A.
    2023-05-01 | PDF
    Animal-vehicle collisions (AVC) pose a serious and growing threat to motorists traveling on ADOT roads. Solutions exist to effectively mitigate AVC, such as wildlife crossing structures (overpasses and underpasses), however these solutions can be costly and untimely. Fence tags, a small reflective tag that is attached to the right-of-way fence and ...
  • Incorporation Resilience Considerations in Transportation Planning TSMO and Asset Management
    Incorporation Resilience Considerations in Transportation Planning, TSMO and Asset Management
    Amekudzi-Kennedy, Adjo ;
    Ashuri, Baabak
    2023-05-01 | PDF
    This project integrates risk-based asset management procedures from the FHWA, AASHTO and the TRB with decision making under deep uncertainty (DMDU) concepts to develop climate vulnerability assessment, and planning and project evaluation capabilities for resilience building in transportation. The research framework includes: (1) understanding the c ...
  • Applied Ergonomics
    Applied Ergonomics
    Guo, Xingzhou ;
    Chen, Yunfeng
    2023-05-01 | PDF
    Ergonomic injuries and solutions have been extensively studied in the construction industry; however, the prevalence of work-related injuries, risky activities, and effective solutions in the transportation industry are not understood. This study aims to explore the prevalence of work-related injuries, risky activities, and potentially ergonomic so ...
    Supporting Files
  • Roadside Truck Placard Readers for Advanced Notice and Response at SafetyCritical Facilities Phase 2
    Roadside Truck Placard Readers for Advanced Notice and Response at Safety-Critical Facilities: Phase 2
    Alden, Andrew S. ;
    Bell, Stephen
    2023-05-01 | PDF
    The transport of hazardous and dangerous materials (HAZMAT) through safety-critical facilities poses significant risk to overall system reliability should those assets be incapacitated by the occurrence of a related incident. This problem is particularly acute for facilities in remote locations such as Virginia’s mountain tunnels on Interstate 77 ( ...
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