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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 1321 - 1340 of 35867 results
  • Evaluation of Curb Ramp Compliance Review of Tools Methods and Time to Develop Error Tolerances
    Evaluation of Curb Ramp Compliance: Review of Tools, Methods, and Time to Develop Error Tolerances
    Che, Erzhuo ;
    Olsen, Michael J.
    2024-02-01 | PDF
    Americans with Disabilities Act (ADA) compliance is critical to ODOT’s mission to provide a safe and reliable multimodal transportation system by allowing equal access to infrastructure. Several challenges have resulted in difficulty in assessing compliance including inherent device errors, differences in measurement methods by inspectors, lack of ...
  • Exploration of UHPC Applications for Montana Bridges
    Exploration of UHPC Applications for Montana Bridges
    Starke, James ;
    Matteson, Kirsten
    2024-02-01 | PDF
    The following research project explores bridge applications of ultra-high performance concrete (UHPC). Bridge deterioration, including decks and other members, is a problem across Montana and UHPC overlays and patching/repairing have been found to be viable alternatives to bridge/element replacement. The current study began with a literature review ...
  • Investigate Potential Connected and Automated Vehicle CAV Liability Issues Within TxDOT Research Report
    Investigate Potential Connected and Automated Vehicle (CAV) Liability Issues Within TxDOT: Research Report
    Hansen, Todd ;
    Hwang, Billy
    2024-02-01 | PDF
    Connected and automated vehicles (CAV) promise momentous and positive changes to most aspects of modern life. Mobility is likely to be characterized by collaborative, communicative and driverless vehicles operating in a connected network of vehicles, infrastructure and wireless devices. One of the most uncertain and as yet undefined areas where cha ...
  • Endangered Species Mitigation Needs Assessment
    Endangered Species Mitigation Needs Assessment
    Schelsky, Wendy M ;
    Burkwald, Kimberly
    2024-02-01 | PDF
    The Illinois Department of Transportation, like most other state transportation agencies, must undergo an environmental review for each transportation project. IDOT identified several challenges that involve regulatory and implementation of federal and state laws protecting threatened and endangered species. We evaluated each state’s environmental ...
  • Active Transportation Counts from Existing OnStreet Signal and Detection Infrastructure
    Active Transportation Counts from Existing On-Street Signal and Detection Infrastructure
    Kothuri, Sirisha ;
    Singleton, Patrick A.
    2024-02-01 | PDF
    This study’s objective was to use data from existing traffic signal infrastructure to estimate pedestrian volumes. Pedestrian push-button actuations were collected from signal controller logs at 49 intersections in western Oregon and an additional 16 intersections in eastern Oregon. These actuations were then compared to observed pedestrian counts, ...
  • Developing Load Distribution Formula for Louisiana CastinPlace Reinforced Concrete Box Culverts
    Developing Load Distribution Formula for Louisiana Cast-in-Place Reinforced Concrete Box Culverts
    Okeil, Ayman M. ;
    Jafari, Navid H
    2024-02-01 | PDF
    This report summarizes the results from an investigation of the behavior of cast-in-place (CIP) reinforced concrete (RC) box culverts. Load rating of CIP-RC box culverts has been a challenge for Departments of Transportation (DOTs) across the nation, including in Louisiana. Excessive conservatism built into the American Association of State Highway ...
  • Using the Portable XRF To IdentifyVerify Field Material Properties
    Using the Portable XRF To Identify/Verify Field Material Properties
    Liu, Zhen ;
    Milla, Jose
    2024-02-01 | PDF
    In order to investigate the feasibility of rapid identification of chemical compounds or detection of certain additives or contaminants in commonly used construction materials with portable X-ray Fluorescence (XRF), stainless steel, anchor bolt, steel nut, steel washer, portland cement (type I, II, and III), class F fly ash, and aggregates were tes ...
  • Developing Load Distribution Formula for Louisiana CastinPlace Reinforced Concrete Box Culverts Technical Summary
    Developing Load Distribution Formula for Louisiana Cast-in-Place Reinforced Concrete Box Culverts [Technical Summary]
    Okeil, Ayman M. ;
    Alaywan, Walid
    2024-02-01 | PDF
    The primary objective of this project was to investigate live load distribution over buried CIP-RC box culverts for the purpose of recommending the most suitable LLDF that can be used in design and load rating. The goals of the project were to: 1. Conduct a parametric investigation of buried CIP-RC box culverts that covers key parameters known to a ...
  • Recommendations for Future Specifications to Ensure Durable Next Generation of Concrete
    Recommendations for Future Specifications to Ensure Durable Next Generation of Concrete
    Kurtis, Kimberly E ;
    Stewart, Lauren K
    2024-02-01 | PDF
    Current Georgia Department of Transportation (GDOT) specifications for concrete rely on prescribing the materials and their proportions as well as minimum strength and workability requirements to indirectly control long-term performance. An alternative method, performance-based specifications (PBS), uses direct measures of long-term durability and ...
  • Advancing Air Mobility in Illinois
    Advancing Air Mobility in Illinois
    Mahmassani, Hani S. ;
    Cummings, Christopher
    2024-02-01 | PDF
    Advanced air mobility (AAM) is a nascent market within the aviation sector of Illinois’ transportation system, promising enhanced movement of people and cargo to previously inaccessible or underserved locations. This project addresses AAM’s prospects and impacts in the state. The research encompasses several tasks, starting with an examination of t ...
  • Best Practices for Work Zone Safety During Traffic Control Placement Removal and Modification Phase II
    Best Practices for Work Zone Safety During Traffic Control Placement, Removal, and Modification – Phase II
    Gambatese, John A. ;
    Moeung, Serey Raksa
    2024-02-01 | PDF
    The set-up, removal, and modification of temporary work zone traffic control on multi-lane, high-speed roadways can create hazardous exposures for workers and motorists. A comprehensive literature review on the topic reveals a lack of a standard process and detailed guidance for setting up and removing traffic control. This study aimed to investiga ...
  • Transit Belabored Issues and Futures for Californias Frontline Transit Workforce
    Transit, Belabored: Issues and Futures for California’s Frontline Transit Workforce
    Wasserman, Jacob L. ;
    Padgett, Allie
    2024-02-01 | PDF
    Frontline transit work can be satisfying and secure—but also stressful or unsafe. Many agencies across the state lacked transit operators in the wake of the pandemic, delaying service restoration. Interviews, wage data, and other sources demonstrate that these shortages were due to both compensation issues and longstanding issues of workforce safet ...
  • US Highway 101 Coastal Hazard Vulnerability and Risk Assessment for Mitigation Prioritization
    US Highway 101 Coastal Hazard Vulnerability and Risk Assessment for Mitigation Prioritization
    Olsen, Michael J. ;
    Allan, Jon
    2024-02-01 | PDF
    US 101 is a vital economic and emergency lifeline that connects coastal communities and provides access to numerous coastal destinations for Oregonians and tourists. Many sections of this highway are highly susceptible to coastal hazards such as erosion, landsliding, wave action, storm surge, flooding, and rising sea levels. In general, US 101 on t ...
  • BrM QuantityBased Bridge Element DeteriorationImprovement Modeling and Software Tools
    BrM Quantity-Based Bridge Element Deterioration/Improvement Modeling and Software Tools
    Fu, Gongkang ;
    Bryk, Gabriel
    2024-02-01 | PDF
    This study reviewed the state of the art and practice in bridge element deterioration / improvement modeling. It also developed a new and practical method for such modeling using element quantities in BrM inspection records along with bridge age. For reliable forecasting, this method uses these quantities directly to determine transition probabilit ...
  • Assessment of HighwayRailroad Grade Crossing Strategies Countermeasures and Technologies to Improve Traffic Safety and Mobility in Florida
    Assessment of Highway-Railroad Grade Crossing Strategies, Countermeasures, and Technologies to Improve Traffic Safety and Mobility in Florida
    Lin, Pei-Sung ;
    Wang, Zhenyu
    2024-02-01 | PDF
    Highway-rail grade crossings (HRGCs) are conflict areas for trains and road users, which present a significant safety concern in Florida. The HRGCs not only affect safety but also have a significant impact on traffic operations. FDOT explored several strategies to improve safety and mobility related to railroad grade crossings, including signage, p ...
  • Feasibility of Composting as an Alternative Disposal Method for Wildlife Vehicle CollisionInduced Carcasses in Colorado Department of Transportation Processes
    Feasibility of Composting as an Alternative Disposal Method for Wildlife Vehicle Collision-Induced Carcasses in Colorado Department of Transportation Processes
    DeMasters, Tim J. ;
    Shields, Maddie F.
    2024-02-01 | PDF
    The Colorado Department of Transportation (CDOT) Region 1 Environmental Unit undertook a pilot project that utilized roadkill carcasses as compost material. Wildlife-vehicle collisions (WVC) are the fourth most common type of vehicle collision crash in Colorado. CDOT maintenance staff are tasked with the removal of carcasses from the roadway to pre ...
  • Curved Integral Abutment Bridge Design Guidelines
    Curved Integral Abutment Bridge Design Guidelines
    Stockin, Adam M ;
    Erickson, Grant E
    2024-01-31 | PDF
    Straight integral abutment bridges have been used throughout the New England states to reduce bridge maintenance costs and extend the service life of structures. Extending integral abutment bridges to curved alignment applications offers bridge owners additional areas to reduce construction costs associated with the lengths of approaches and right- ...
  • Define a Statewide Plan for a Sustainable RealTime Travel Time Network for Texas Hurricane Evacuations and Safe Citizen Return Project Summary
    Define a Statewide Plan for a Sustainable Real-Time Travel Time Network for Texas Hurricane Evacuations and Safe Citizen Return [Project Summary]
    Boyles, Stephen ;
    Bathgate, Kyle
    2024-01-31 | PDF
    This research study was conducted to assess the existing level of implementation, user preferences for the usage of real-time data, and gaps in the current traffic monitoring system. Understanding these aspects is crucial for determining the effective device deployment strategies, and developing recommendations for monitoring, prioritizing system e ...
  • An Exploration of the Use of Artificial Intelligence for Enhanced Traffic Management Operations and Safety
    An Exploration of the Use of Artificial Intelligence for Enhanced Traffic Management, Operations and Safety
    Juri, Natalia Ruiz ;
    Perrine, Ken
    2024-01-24 | PDF
    This project explored the use and value of artificial intelligence and machine learning (ML) in transportation taking a multi-pronged approach that includes a literature review, a workshop, a survey, the development of3 prototype ML models for four high-priority use cases, and the field testing of one of the prototyped models. Initial tasks were ex ...
  • Public Awareness on Distracted Driving of CAVs and Evaluating the Distractions
    Public Awareness on Distracted Driving of CAVs and Evaluating the Distractions
    Jeihani, Mansoureh ;
    Javid, Ramina
    2024-01-16 | PDF
    Distracted driving is a major concern in traffic safety, leading to many fatal crashes in the United States in recent years. Every year, distracted driving costs lives. In the U.S., distracted driving claims the lives of nine people per day. With the increasing presence of CAV technologies, there is a corresponding rise in the quantity of auditory ...
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