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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 1001 - 1020 of 36104 results
  • Safety Evaluation of Jturn Intersections in Missouri
    Safety Evaluation of J-turn Intersections in Missouri
    Edara, Praveen ;
    Qing, Zhu
    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- ...
  • Snow Plow Performance Measures in NonRWIS Locations
    Snow Plow Performance Measures in Non-RWIS Locations
    Jiang, Gang ;
    Kuang, Biao
    2024-08-01 | PDF
    This project aims to enhance traffic safety by developing an Artificial Intelligence (AI) model and the weather interpolation method to evaluate snow cover conditions on road surfaces using existing roadside Closed-Circuit Television system (CCTV) images in non-Road Weather Information System (RWIS) locations. Snow- cover significantly impacts traf ...
  • InService Safety Evaluation of Indiana Impact Attenuators and Barrier End Treatments Summary
    In-Service Safety Evaluation of Indiana Impact Attenuators and Barrier End Treatments [Summary]
    Tarko, Andrew P. ;
    Romero, Mario A.
    2024-08-01 | PDF
    Crashes related to barrier end treatments and impact attenuators generally have higher severity levels than those colliding with barrier faces. To select the most effective end treatments, the in-service safety evaluation of such end treatments under various operational conditions was needed. This study linked 7 years of crash records with the corr ...
  • Investigation of Hot Mix Asphalt Aging Effect on Mechanical Properties of Mixes Based on Their Binder Performance Results [supporting dataset]
    Abdallah, Imad ;
    Montoya, Miguel A.
    2024-08-01 | XLSX
    The raw data includes one excel file (418 KB) covering measurements including time, temperature, frequency, phase angle, complex modulus, elastic modulus, viscous modulus, complex viscosity, shear stress, and strain.
    Dataset Supporting Files
  • Develop a Retrofit Design for Guard Fence System To Enhance Motorcycle Safety
    Develop a Retrofit Design for Guard Fence System To Enhance Motorcycle Safety
    Schulz, Nathan D. ;
    Bligh, Roger P.
    2024-08-01 | PDF
    Motorcyclists are among the most vulnerable users of the roadway system. The appropriate design of roadside safety systems plays an important role in the severity of injuries caused by motorcycle crashes. Data show that from 2004 to 2017, the number of fatalities related to motorcycle impacts against safety barriers was greater than the number of f ...
  • Evaluate the Safety Effects of Adopting a StopasYield Law for Cyclists in California
    Evaluate the Safety Effects of Adopting a Stop-as-Yield Law for Cyclists in California
    Mahdinia, Iman ;
    Griswold, Julia B
    2024-08-01 | PDF
    The escalating number of injuries and fatalities among cyclists is a pressing safety concern. In the United States, communities are actively seeking strategies to boost cyclist safety, with some states implementing bike-specific policies, such as stop-as-yield laws, to support cyclists. Stop-as-yield laws allow cyclists to treat stop signs as yield ...
  • Friction Enhancements to Asphalt Pavement Surfaces Research Summary
    Friction Enhancements to Asphalt Pavement Surfaces [Research Summary]
    Abdelrahman, Magdy
    ORCID ICON IMG
    2024-08-01 | PDF
    Title 14 of the Code of Federal Regulations defines regulations that are intended to protect aircraft occupants in the event of a survivable civil aircraft crash. The standards for emergency landing conditions (25.562) were developed with a focus primarily on forward-facing seats, although the rules apply to all seats regardless of installation ori ...
  • InService Safety Evaluation of Indiana Impact Attenuators and Barrier End Treatments
    In-Service Safety Evaluation of Indiana Impact Attenuators and Barrier End Treatments
    Pineda-Mendez, Raul A ;
    Guo, Qiming
    2024-08-01 | PDF
    Crashes related to barrier end treatments and impact attenuators generally have higher severity levels than those colliding with barrier faces. To select the most effective end treatments, the in-service safety evaluation of such end treatments under various operational conditions was needed. This study linked 7 years of crash records with the corr ...
  • 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 ...
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