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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 981 - 1000 of 36049 results
  • Using Vehicle Probe Data to Evaluate Speed Limits Project Summary
    Using Vehicle Probe Data to Evaluate Speed Limits [Project Summary]
    Fitzpatrick, Kay ;
    Kutela, Boniphace
    2024-08-01 | PDF
    When speed limits are set via an engineering speed zone study, the operating speed for a site is needed. This research project investigated whether probe speed data (rather than speeds measured in the field) could reasonably be used in a speed zone study. The idea for using probe speed data is to develop conversion equations that would convert an a ...
  • Safety Evaluation of Jturn Intersections in Missouri Research Brief
    Safety Evaluation of J-turn Intersections in Missouri [Research Brief]
    Edara, Praveen
    ORCID ICON IMG
    2024-08-01 | PDF
    The design of J-turn intersections has gained its prevalence in Missouri due to their demonstrated safety benefits. However, with the growing number of J-turns and the availability of more crash data, there is a renewed need to deepen the understanding of the safety performance of J-turns. This study presents a comprehensive safety evaluation of J- ...
  • Constructing HighDensity Longitudinal Joints To Improve Pavement Longevity
    Constructing High-Density Longitudinal Joints To Improve Pavement Longevity
    Chitnis, Vipul ;
    Sukhija, Mayank
    2024-08-01 | PDF
    In Oregon, asphalt cracking is the primary distress mode, necessitating costly rehabilitation and maintenance. Cracking failures around longitudinal joints (especially on roadway sections with centerline rumble strips) have been an important issue in Oregon, affecting the overall long-term performance of the Oregon roadway network. Longitudinal joi ...
  • Strategies to Address HeadOn Crashes
    Strategies to Address Head-On Crashes
    Alluri, Priyanka ;
    Gattupal, Harsha
    2024-08-01 | PDF
    While head-on crashes generally constitute a small proportion of total crash occurrences, they often result in fatal and incapacitating injuries. As a result, many agencies are exploring strategies to mitigate head-on crashes and resulting injuries. This research examined head-on crashes that occurred in Florida Department of Transportation (FDOT) ...
  • Design and Rehabilitation Strategies for Permeable Friction Course Pavements
    Design and Rehabilitation Strategies for Permeable Friction Course Pavements
    Arámbula-Mercado, Edith ;
    Estakhri, Cindy
    2024-08-01 | PDF
    Thousands of miles of permeable friction course (PFC) pavements have performed well for the last 10 to 15 years on Texas highways. PFC pavement reduces hydroplaning, splash and spray, and pavement noise and improves ride quality and safety in wet weather. Hundreds of miles of PFC pavements are now at the end of their service life and need to be reh ...
  • Moving Beyond the Colors The Full LifeCycle Emissions of Hydrogen Production Pathways for California
    Moving Beyond the Colors: The Full Life-Cycle Emissions of Hydrogen Production Pathways for California
    Lipman, Timothy ;
    Busch, Pablo
    2024-08-01 | PDF
    There is growing interest in the use of hydrogen as a transportation fuel but the environmental benefits of using hydrogen depend critically on how it is produced and distributed. Leading alternatives to using fossil natural gas to make hydrogen through the conventional method of steam methane reforming include using electrolyzers to split water in ...
  • Proactive Traffic Incident Management in Alabama
    Proactive Traffic Incident Management in Alabama
    Liu, Jun ;
    Zhang, Zihe
    2024-08-01 | PDF
    The recent availability of the state-wide large-scale real-time traffic database, traffic incident database, and road crash database has enabled more efficient traffic incident management. This project aims to assist traffic incident management (TIM) in Alabama by leveraging three large-scale real-time databases maintained by ALDOT including the AL ...
  • Development of Improved Inspection Techniques Using LiDAR for Deteriorated Steel Beam Ends
    Development of Improved Inspection Techniques Using LiDAR for Deteriorated Steel Beam Ends
    Provost, Aidan ;
    Gerasimidis, Simos
    2024-08-01 | PDF
    This report summarizes the research on enhancing the current inspection protocols for MassDOT using 3D scanning technologies. The first part of the report presents a thorough review of the current methods using 3D scanning techniques for bridge inspection. The report also includes laboratory and field scans on corroded beam ends. The research team ...
  • Feasibility of 3D Printing Applications for Highway Infrastructure Construction and Maintenance
    Feasibility of 3D Printing Applications for Highway Infrastructure Construction and Maintenance
    Schagen, B D ;
    Zhang, S.
    2024-08-01 | PDF
    In recent years there has been a significant increase of interest in additive manufacturing (AM; also frequently referred to as 3D printing), yet AM is largely unexplored within infrastructure projects. By harnessing the new capabilities of AM, researchers have managed to access unprecedented new design capabilities and operational flexibility (e.g ...
  • Use of Machine Learning Methods to Obtain a Reliable Predictive Model for Resilient Modulus of Subgrade Soil
    Use of Machine Learning Methods to Obtain a Reliable Predictive Model for Resilient Modulus of Subgrade Soil
    Khoshnevisan, Sara ;
    Norouzi, Mehdi
    2024-08-01 | PDF
    This project explores the development and optimization of predictive models for the resilient modulus (MR) of subgrade soil using advanced machine learning techniques. Comprehensive data from INDOT spanning several years was analyzed to enhance the accuracy of MR predictions. The study not only refined the modeling approach through statistical meth ...
  • Electric Vehicles Public Perceptions Expectations and WillingnesstoPay Summary
    Electric Vehicles: Public Perceptions, Expectations, and Willingness-to-Pay [Summary]
    Gkritza, Konstantina ;
    Ukkusuri, Satish
    2024-08-01 | PDF
    The primary objective of this project was to understand Indiana resident’s perspectives on electric vehicles (EVs), including adoption incentives and barriers, awareness of adoption incentives, charging preferences, and general travel patterns. A secondary objective was to establish a framework for identifying EV users, detailing their trips, and g ...
  • Geosynthetic Reinforcement in Asphalt Overlays for Increased Roadway Structural Capacity
    Geosynthetic Reinforcement in Asphalt Overlays for Increased Roadway Structural Capacity
    Kumar, V Vinay ;
    Roodi, Gholam H.
    2024-08-01 | PDF
    A comprehensive full-scale field monitoring program involving different types of geosynthetic reinforcement products was successfully implemented. The monitoring system included asphalt strain gauges, thermocouples, geophones, and moisture sensors. The monitoring results indicate that all asphalt overlay sections reinforced with geosynthetic reinfo ...
  • Improving Smart Work Zone Deployments in Texas
    Improving Smart Work Zone Deployments in Texas
    Ullman, Gerald ;
    Miller, Matt
    2024-08-01 | PDF
    Smart work zones utilize technologies and strategies to enhance transportation safety, mobility, traveler satisfaction, and even construction/maintenance productivity through and around work zones. To date, there have been both positive and negative experiences with the technology. The objectives of this study were to determine why some smart work ...
  • Electric Vehicles Public Perceptions Expectations and WillingnesstoPay
    Electric Vehicles: Public Perceptions, Expectations, and Willingness-to-Pay
    Moras, Bruno Cesar Krause ;
    Chen, Xiaowei
    2024-08-01 | PDF
    The primary objective of this project was to understand Indiana resident’s perspectives on electric vehicles (EVs), including adoption incentives and barriers, awareness of adoption incentives, charging preferences, and general travel patterns. A secondary objective was to establish a framework for identifying EV users, detailing their trips, and g ...
  • Accessible Bus Stop Design in the Presence of Bike Lanes
    Accessible Bus Stop Design in the Presence of Bike Lanes
    Christofa, Eleni ;
    Ai, Chengbo
    2024-08-01 | PDF
    Floating bus stops are used to facilitate transit operations and enhance accessibility by allowing in-lane stops. A bike channel separates the platform from the sidewalk, preventing conflicts between buses and bicycles but potentially causing conflicts between bicyclists and bus riders. The objectives of this research are to: 1) investigate bus rid ...
  • Evaluation of Manual Thermal Brake Screening Systems
    Evaluation of Manual Thermal Brake Screening Systems
    Koo, Jeeyen ;
    Leddy, David
    2024-08-01 | PDF
    In 2021, manual thermal brake screening systems were installed at Lyon EB and Rowan County weigh stations. Two additional units were installed at Laurel SB and Scott County weigh stations the following year. Although this system is called a thermal brake screening system, its thermal camera images are used to find both brake and tire-related violat ...
  • FX2Division Shared Bicycle and Pedestrian Platform Evaluation
    FX2-Division: Shared Bicycle and Pedestrian Platform Evaluation
    McNeil, Nathan ;
    Kothuri, Sirisha
    2024-08-01 | PDF
    To accommodate passing bicyclists and transit riders accessing the new FX2 TriMet bus rapid transit line in Portland, TriMet worked with the City of Portland and broad group of stakeholders and partners to design and implement a new shared use bus platform that incorporates a sidewalk / platform level bike lane. The SE Division corridor was designa ...
  • GoGallatin Annual Report July 1 2023 June 30 2024
    GoGallatin Annual Report: July 1, 2023 – June 30, 2024
    Harriet, Nathan ;
    Madsen, Matthew
    2024-08-01 | PDF
    This third annual report seeks to share our programmatic growth, successes, and areas for improvement with our partners and the community. We are proud of our work, the work of our partners, and are excited for our future, and we think you will be as well.
  • Business Processes to Prioritize Traffic Signal Retiming and Assess the Impact of Retiming Activities Summary
    Business Processes to Prioritize Traffic Signal Retiming and Assess the Impact of Retiming Activities [Summary]
    Bullock, Darcy M.
    ORCID ICON IMG
    2024-08-01 | PDF
    The Indiana Department of Transportation (INDOT) manages over 2,000 traffic signals in the State. It is unfeasible to identify systemwide improvement opportunities by evaluating the performance of thousands of traffic signals on monitoring dashboards. This report describes how a scalable technique based on connected vehicle (CV) trajectory data sys ...
  • 07002 Geosynthetic Reinforcement in Asphalt Overlays for Increased Roadway Structural Capacity Summary
    0-7002: Geosynthetic Reinforcement in Asphalt Overlays for Increased Roadway Structural Capacity [Summary]
    Kumar, V Vinay ;
    Roodi, Gholam H.
    2024-08-01 | PDF
    Geosynthetic products, including geogrids, geotextiles, geocells, geonets, and geomembranes, can be used to improve roadway systems significantly through a wide range of functions, such as separation, filtration, stiffening, reinforcement, drainage, hydraulic/gas barriers, and protection. One of the several applications involving geosynthetics is t ...
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