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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 401 - 420 of 35440 results
  • Investigation of Commercial Motor Vehicle CMVRelated Crashes in Ohio Work Zones
    Investigation of Commercial Motor Vehicle (CMV)-Related Crashes in Ohio Work Zones
    Finley, Melisa D. ;
    Lopez, Nicholas
    2025-02-01 | PDF
    This research project was conducted to identify causation trends and factors that contribute to commercial motor vehicle (CMV)-involved work zone crashes in Ohio. In addition, the research project examined how workspace access points contribute to the CMV crash risk in work zones. In Phase 1, the research team reviewed previous research findings, c ...
  • Investigation of Commercial Motor Vehicle CMVRelated Crashes in Ohio Work Zones Fact Sheet
    Investigation of Commercial Motor Vehicle (CMV)-Related Crashes in Ohio Work Zones [Fact Sheet]
    Finley, Melisa D. ;
    Lopez, Nicholas
    2025-02-01 | PDF
    This research project was conducted to identify causation trends and factors that contribute to commercial motor vehicle (CMV)-involved work zone crashes in Ohio. In addition, the research project examined how workspace access points contribute to the CMV crash risk in work zones. In Phase 1, the research team reviewed previous research findings, c ...
  • Managing the Traffic Impacts of Highway Infrastructure Constructions A Framework for Construction Planning
    Managing the Traffic Impacts of Highway Infrastructure Constructions: A Framework for Construction Planning
    Liu, Jun ;
    Xu, Ningzhe
    2025-02-01 | PDF
    Highway infrastructure construction projects often necessitate temporary traffic pattern changes, such as lane or road closures, which can impact mobility, safety, and the environment. This report presents a systematic framework and tool designed to assist transportation agencies in evaluating and comparing alternative construction plans. The frame ...
  • Safety Performance of NonSignalized Traffic Control Strategies
    Safety Performance of Non-Signalized Traffic Control Strategies
    Tarko, Andrew P. ;
    Romero, Mario A.
    2025-02-01 | PDF
    The Indiana safety management program targets the reduction of crashes at high-speed, two-way stop-controlled (TWSC) intersections, which are responsible for 8.2% of serious crashes statewide that cause approximately 1,000 serious injuries and over 90 fatalities annually. Key risk factors include human error, high traffic volumes, and high speeds. ...
  • Safety Performance of NonSignalized Traffic Control Strategies Brief
    Safety Performance of Non-Signalized Traffic Control Strategies [Brief]
    Tarko, Andrew P. ;
    Romero, Mario A.
    2025-02-01 | PDF
    The Indiana safety management program targets the reduction of crashes at high-speed, two-way stop-controlled (TWSC) intersections, which are responsible for 8.2% of serious crashes statewide that cause approximately 1,000 serious injuries and over 90 fatalities annually. Key risk factors include human error, high traffic volumes, and high speeds. ...
  • Current Practices in Rock Scaling
    Current Practices in Rock Scaling
    Greer, Daryl J. ;
    Ashurst Jr, Kean H.
    2025-02-01 | PDF
    Rockfalls, which result from the chemical and physical weathering of aging exposed rock cuts, occur frequently along many Kentucky roadways and can endanger travelers. Mitigating rockfalls often requires substantial excavation, procuring additional right of way, and/or hiring specialty contractors. An alternative to these expensive processes is roc ...
  • TR808 A Sustainable AirEntraining and Internal Curing Agent
    TR-808: A Sustainable Air-Entraining and Internal Curing Agent
    Yellavajjala, Ravi Kiran ;
    Jalal, Asif
    2025-02-01 | PDF
    Air entrainment of concrete is crucial to dissipate the tensile stresses introduced by the volume expansion of frozen water in the capillary pores of the concrete. The air void system achieved using popular surfactants is sensitive to the properties of cementitious materials, water content, admixtures, aggregate, etc. Furthermore, vibration, compac ...
  • Value of Dedicated RightofWay Transit Service Reliability and User Impacts
    Value of Dedicated Right-of-Way: Transit Service Reliability and User Impacts
    Song, Ying ;
    Zeng, Xiaohuan
    2025-02-01 | PDF
    Transit services connect people to jobs and opportunities, fostering vibrant communities and multimodal travel along service corridors. A transit right-of-way (ROW) can help buses bypass congestion and stay on schedule. Many studies have proved that transit ROWs effectively improve service reliability and reduce user costs. However, these studies o ...
  • Examination of Lighting Practices at Crosswalks
    Examination of Lighting Practices at Crosswalks
    Van Houten, Ron ;
    Kwigizile, Valerian
    2025-01-31 | PDF
    Following a review of the lighting literature and new lighting products, this study examined the lighting level at the location of night fatal and incapacitating (K&A) pedestrian crashes over a 5-year period in SW & SE Michigan. Not surprisingly, the results revealed that almost all the night pedestrian crashes coded on police reports as occurring ...
  • Assessment and Shear Strengthening of Existing CastinPlace and Precast Concrete Bridge Girders
    Assessment and Shear Strengthening of Existing Cast-in-Place and Precast Concrete Bridge Girders
    Grayson-Wallace, Brendan ;
    Aljasar, Ahmed
    2025-01-21 | PDF
    This research study investigated the feasibility of two shear-strengthening techniques to assess their effectiveness in enhancing the shear capacity of existing reinforced concrete girder bridges. The first scheme consisted of using Near-Surface-Mounted (NSM) bars while the second scheme comprised Partially Embedded Bars (PEB) in the web of the gir ...
  • 07162 Quantifying the Benefits of Roadside Vegetation
    0-7162: Quantifying the Benefits of Roadside Vegetation
    Ryu, Kyoeng Rok
    2025-01-15 | PDF
    Transportation agencies and state DOTs have established roadside vegetation programs to enhance sustainability, quality of life, and the aesthetics of the transportation systems. However, a comprehensive toolkit to quantify the benefits and risks of various roadside vegetation types and applications has been largely lacking across the nation, inclu ...
  • Quantifying the Benefits of Roadside Vegetation
    Quantifying the Benefits of Roadside Vegetation
    Ryu, Kyoeng Rok ;
    Im, Joowon
    2025-01-15 | PDF
    Transportation agencies and state DOTs have established roadside vegetation programs to enhance sustainability, quality of life, and the aesthetics of the transportation systems. However, a comprehensive toolkit to quantify the benefits and risks of various roadside vegetation types and applications has been largely lacking across the nation, inclu ...
  • Chemical Incident Reports Events Reported to the CSB Under the Accidental Release Reporting Rule Volume 1
    Chemical Incident Reports: Events Reported to the CSB Under the Accidental Release Reporting Rule [Volume 1]
    U.S. Chemical Safety and Hazard Investigation Board
    2025-01-14 | PDF
    The U.S. Chemical Safety and Hazard Investigation Board has released a compilation of summaries of chemical accidents that have occurred since the agency’s accidental release reporting rule went into effect in March 2020. The compilation presents summaries and probable causes of 26 incidents in chronological order, beginning with the release of hyd ...
  • Drive MN Summary
    Drive MN [Summary]
    Minnesota. Department of Transportation
    2025-01-09 | PDF
    Automated vehicles (AVs) rely heavily on roadway infrastructure to function. This project used technology-equipped research vehicles to drive over 1,000 miles of Minnesota roadways to gain a better understanding of potential infrastructure issues that would inhibit the operations of AVs. The outcomes of this project were intended to be used by tran ...
  • A Systemic Evaluation of Wrong Way Driving Crashes and Countermeasures on Virginia Roads
    A Systemic Evaluation of Wrong Way Driving Crashes and Countermeasures on Virginia Roads
    Cho, Hyun W. ;
    Robartes, Erin M
    2025-01-01 | PDF
    Wrong-way driving (WWD) crashes are a small percentage of all crashes but tend to be more severe. The purpose of this project was to perform a systemic evaluation of WWD incident and crash risks and identify countermeasures for Virginia’s roadways. This evaluation included assessing the magnitude of WWD crashes and WWD-related 911 calls in Virginia ...
  • Wireless Charging Revenue Generation from Kansas Pavements
    Wireless Charging Revenue Generation from Kansas Pavements
    Aziz, H.M. Abdul
    2025-01-01 | PDF
    In addition to the expected environmental and energy security related benefits, however, high EV adoption raises concerns about the negative impact on revenue generation that has previously come from the gasoline tax. The Highway Trust Fund (HTF) has been challenged repeatedly for future sustenance, including declining gas tax revenue as consumers ...
  • Wireless Charging Revenue Generation from Kansas Pavements Technical Summary
    Wireless Charging Revenue Generation from Kansas Pavements [Technical Summary]
    Aziz, H.M. Abdul
    2025-01-01 | PDF
    The Wireless charging pavements, which leverage induction charging via primary and secondary coils in concrete pavements, allow an EV to charge either while stationary or traveling as fast as 62 miles per hour (mph) (e.g., the Qualcomm developed testbed). Wireless charging pavements can help reduce the “range anxiety” of EV owners and eventually in ...
  • Using Unmanned Aerial Systems to Facilitate Traffic Incident Management
    Using Unmanned Aerial Systems to Facilitate Traffic Incident Management
    Schultz, Grant G. ;
    Hill, Adam W.
    2025-01-01 | PDF
    Incident management teams (IMTs) minimize crash impacts and create a safer highway network for people and communities. Research has shown that optimizing the IMT fleet has strong benefits to the roadway network, but future models indicate that increasing IMT presence may have diminishing returns after excessive roadway saturation. The Utah Departme ...
  • Estimating the AsPlaced Grout Volume of Auger Cast Piles Part 1 Summary
    Estimating the As-Placed Grout Volume of Auger Cast Piles – Part 1 [Summary]
    Castellanos, Juan ;
    Mullins, Gray
    2025-01-01 | PDF
    The objective of this research project was to develop a reliable method for estimating the in-pile grout volume of auger cast piles. The study also sought to standardize best practices to ensure compliance with Federal Highway Administration (FHWA) recommendations and State requirements.
  • Effects of Education on Speeding Traffic Tech
    Effects of Education on Speeding [Traffic Tech]
    United States. Department of Transportation. National Highway Traffic Safety Administration. Office of Behavioral Safety Research
    2025-01-01 | PDF
    This Traffic Tech briefly summarizes the full report, Effects of Education on Speeding Behavior, examining the effect of speeding education on speeding behavior.
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