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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 721 - 740 of 36055 results
  • Experiences from Early Implementations of UHPC Overlays TechNote
    Experiences from Early Implementations of UHPC Overlays [TechNote]
    Garber, David ;
    El-Helou, Rafic
    2024-12-01 | PDF
    Short-span bridge superstructures are commonly made of precast concrete elements, and those elements are proportioned according to the properties of conventional concrete. The emergence of ultra-high-performance concrete (UHPC), and the release of the AASHTO Guide Specification for Structural Design with UHPC, creates new possibilities for the rede ...
  • FourYear Trends of Personal Mobility Devices in Metropolitan Vancouver The Evolution of Mode Shares Speeds and Comfort in OffStreet Paths
    Four-Year Trends of Personal Mobility Devices in Metropolitan Vancouver: The Evolution of Mode Shares, Speeds, and Comfort in Off-Street Paths
    Bigazzi, Alexander York ;
    Hassanpour, Amir
    2024-12-01 | PDF
    Micromobility or personal mobility devices (PMD) such as bicycles, scooters, and skateboards, with or without electric-assist, are increasingly popular for urban travel, which poses challenges in the constrained spaces of cycling facilities and multi-use paths. Consequently, understanding the evolving usage of PMD and their impacts on other path us ...
  • Performance Characterization of an UltraHigh Performance Concrete Deck Connection for Alabama Bridges
    Performance Characterization of an Ultra-High Performance Concrete Deck Connection for Alabama Bridges
    Aaleti, Sriram ;
    Kreger, Michael E.
    2024-12-01 | PDF
    Cast-in-place bridges using normal concrete have been commonly used in the state of Alabama for short-span bridges. Even though their performance is satisfactory after construction and opening to traffic, this construction method requires a significant amount of construction time and on-site labor compared to the use of precast systems. The Acceler ...
  • Statewide Drone Registration Rule Development
    Statewide Drone Registration Rule Development
    Chamberlin, Robert
    2024-12-01 | PDF
    The Division of Aeronautics (DOA) has been working toward a robust Advanced Air Mobility (AAM) and Unmanned Aerial Systems (UAS) Program that could benefit both state agencies and commercial partners/operators. Over the past few years, the DOA office has been working with Utah Lawmakers to develop a regulatory framework. A Statewide Drone Registrat ...
  • Load Rating of Reinforced Concrete Slab Bridges Using Field Testing
    Load Rating of Reinforced Concrete Slab Bridges Using Field Testing
    Andrawes, Bassem ;
    Colombani, Isaias A
    2024-12-01 | PDF
    Bridge load-rating analysis is typically used to assess the safe load-carrying capacity of bridges. However, in many cases, this analytical approach was proven to be too conservative, which leads to unnecessary bridge postings and road restrictions. In such cases, field testing is sought as a more reliable method for assessing the structural condit ...
  • Zuni Bowl and One Rock Check Dam Research Phase 1
    Zuni Bowl and One Rock Check Dam Research – Phase 1
    Rio Grande Return
    2024-12-01 | PDF
    The Zuni Bowl and One Rock Check Dam Research Project, commissioned by the New Mexico Department of Transportation (NMDOT) and conducted by Rio Grande Return, investigates the effectiveness of Zuni Bowl and One Rock Dam structures as erosion control solutions for drainage issues affecting roadway infrastructure. This Phase 1A study aims to evaluate ...
  • Effectiveness of Short Solid Barriers to Reduce Noise Generated by Different Types of Highway Vehicles
    Effectiveness of Short Solid Barriers to Reduce Noise Generated by Different Types of Highway Vehicles
    Owolabi, Oludare ;
    Lodico, Dana
    2024-12-01 | PDF
    Tall highway noise barriers have served as an effective noise abatement strategy. However, it comes with the high cost and limited adoption in diverse environments. The purpose of this study was to investigate the feasibility and reasonableness of short safety barriers as a highway noise abatement strategy. Through purposeful selection, five out of ...
  • Effective Methods to Safely Communicate with Commercial Motor Vehicles Summary
    Effective Methods to Safely Communicate with Commercial Motor Vehicles [Summary]
    Edara, Praveen
    ORCID ICON IMG
    2024-12-01 | PDF
    One critical aspect of a proactive approach to improving the safety of commercial motor vehicles (CMVs) involves how to communicate with CMV drivers safely and effectively through an electronic notification system (ENS). The objectives of this project are to: 1) conduct a review of existing ENS methods in use by CMV drivers, trucking companies, and ...
  • Investigation of UAS Platform and Personnel Development and Preparation through Lab and Site Testing
    Investigation of UAS Platform and Personnel Development and Preparation through Lab and Site Testing
    Almasi, Pouya ;
    Zhang, Qianyun
    2024-12-01 | PDF
    We propose a pilot program to initialize the UAS-based bridge inspection program in component level to enhance the bridge inspection practice in New Mexico State. In the proposed program, UAS-based bridge inspection strategies, data interpretation frameworks, and implementation software for individual NBI classified bridge components will be develo ...
  • Development of a Visualization Sharing and Processing Platform for LargeScale Highway Point Cloud Data
    Development of a Visualization, Sharing, and Processing Platform for Large-Scale Highway Point Cloud Data
    Remache-Patino, Bryan ;
    Gerasimidis, Simos
    2024-12-01 | PDF
    This study presents the development and validation of a web-based platform designed for the visualization, sharing, and processing of large-scale LiDAR point cloud data tailored to the operational needs of MassDOT. Leveraging open-source technologies, particularly Potree, the platform addresses key challenges associated with the management of high- ...
  • Design Guidelines and Mitigation Strategies for Reducing Sedimentation of MultiBarrel Culverts Brief
    Design Guidelines and Mitigation Strategies for Reducing Sedimentation of Multi-Barrel Culverts [Brief]
    Muste, Marian
    ORCID ICON IMG
    2024-12-01 | PDF
    The accumulation of sediments at culverts is a chronic operational issue, frequently occurring at multi-barrel culverts located in erosion-prone watersheds. Sediment deposits can develop rapidly, impairing the culvert’s capacity to convey design flows and potentially leading to damage to both transportation infrastructure (e.g., road and culvert ov ...
  • TITAN An Interactive Webbased Framework for Transportation Data Integration and Analytics Phase 2 Summary
    TITAN – An Interactive, Web-based Framework for Transportation Data Integration and Analytics – Phase 2 [Summary]
    Adu-Gyamfi, Yaw
    ORCID ICON IMG
    2024-12-01 | PDF
    The TITAN project, now in its second phase, is a cutting-edge, interactive web-based framework designed for the warehousing, integration, analytics, and visualization of transportation data. This phase has successfully implemented resilient and scalable database architectures, enabling rapid storage and retrieval of massive datasets, which are crit ...
  • Benefits Challenges and Opportunities of Different LastMile Delivery Strategies
    Benefits, Challenges, and Opportunities of Different Last-Mile Delivery Strategies
    Jaller, Miguel ;
    Pahwa, Anmol
    2024-12-01 | PDF
    As online shopping nears its third decade, it is clear that its impacts on urban goods flow are profound. Increased freight traffic and related negative externalities such as greenhouse gas emissions and local air pollution can impede sustainability goals. In response, e-retailers are exploring innovative distribution strategies to enhance last-mil ...
  • Improving the Effectiveness of Zipper Merge Lane Control in Freeway Work Zones
    Improving the Effectiveness of Zipper Merge Lane Control in Freeway Work Zones
    Savolainen, Peter T. ;
    Gates, Timothy J.
    2024-12-01 | PDF
    The late merge, or “zipper” merge, has become a common strategy to increase work zone capacity by encouraging drivers to stay in their lanes until they reach a defined merge area, where they alternately merge. While the zipper merge has been shown to provide improved operational performance, there is considerable variability in driver familiarity a ...
  • Pedestrian Safety and Accessibility Best Practices for Channelized RightTurn Lanes
    Pedestrian Safety and Accessibility Best Practices for Channelized Right-Turn Lanes
    Gates, Timothy J. ;
    Kay, Jonathan J.
    2024-12-01 | PDF
    This research sought to identify best practices for channelized right-turn lanes (CRT) that better accommodate the safety and accessibility needs of all road users. This was accomplished through a comprehensive literature review, a state-of-the-practice survey of state and local roadway agencies (nationwide and within Minnesota), a review of agency ...
  • Use of Geothermal Energy for Deicing Approach Pavement Slabs and Bridge Decks Phase II Extension
    Use of Geothermal Energy for Deicing Approach Pavement Slabs and Bridge Decks: Phase II Extension
    Yu, Xinbao ;
    Puppala, Anand J.
    2024-12-01 | PDF
    The objective of the control system is to run the deicing system efficiently and effectively under different winter weather conditions. The system can be operated for bridge deicing in heat pump or bypass mode. The heat pump mode involves all four heat pumps and the GLHE during bridge deicing, while the bypass mode only relies on GLHE to heat the b ...
  • Improving the Effectiveness of Zipper Merge Lane Control in Freeway Work Zones Summary
    Improving the Effectiveness of Zipper Merge Lane Control in Freeway Work Zones [Summary]
    Savolainen, Peter T. ;
    Gates, Timothy J.
    2024-12-01 | PDF
    The late merge, or “zipper” merge, has become a common strategy to increase work zone capacity by encouraging drivers to stay in their lanes until they reach a defined merge area, where they alternately merge. While the zipper merge has been shown to provide improved operational performance, there is considerable variability in driver familiarity a ...
  • Development of a 475mm Asphalt Mixture Design Technical Summary
    Development of a 4.75-mm Asphalt Mixture Design [Technical Summary]
    Salari, Saman ;
    Rupnow, Tyson D.
    2024-12-01 | PDF
    The Louisiana Department of Transportation and Development (DOTD) and other agencies continually identify techniques to reduce roadway maintenance and construction costs. One common approach to this task is the introduction of asphalt mixtures with a smaller nominal maximum aggregate size (NMAS) for utilization in roadways. Excessive stockpiles of ...
  • OSTR Research Roundup NovemberDecember 2024
    OST-R Research Roundup: November/December 2024
    United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
    2024-12-01 | OST-R Research Roundup | PDF
    News from across OST-R and its research community.
  • Traffic Safety Facts Overview of the 2023 Crash Investigation Sampling System
    Traffic Safety Facts: Overview of the 2023 Crash Investigation Sampling System
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2024-12-01 | National Transportation Statistics (NTS) | PDF
    Data from the 2023 Crash Investigation Sampling System (CISS) shows there were an estimated 2,555,023 police-reported motor vehicle traffic crashes nationwide where at least one passenger vehicle (i.e., passenger car, light truck, or van less than 10,000 lb) was towed from the crash scene, which resulted in an estimated 1,043,485 injured occupants ...
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