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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 1101 - 1120 of 36049 results
  • Assessing the Functionality of Transit and Shared Mobility Systems After Earthquakes
    Assessing the Functionality of Transit and Shared Mobility Systems After Earthquakes
    Soga, Kenichi ;
    Comfort, Louise
    2024-06-01 | PDF
    Located within the seismically active Pacific Ring of Fire, California's transportation infrastructure, especially in the Bay Area, is susceptible to earthquakes. A review of current research and stakeholder interviews revealed a growing awareness of emergency preparedness among local jurisdictions and transit agencies in recent years. However, man ...
  • Evaluation of EnhancedFriction Asphalt Overlays and Surface Treatments
    Evaluation of Enhanced-Friction Asphalt Overlays and Surface Treatments
    Moore, Nathan ;
    Heitzman, Michael
    2024-06-01 | PDF
    Highway agencies are responsible for maintaining pavements with good surface friction performance. High crash locations are often treated with a high friction surface treatment that has very good friction performance but has a high cost. This study examined asphalt surface mixtures with alternative friction aggregates using accelerated laboratory T ...
  • UltraHigh Performance Concrete UHPC Application in Link Slabs for Crack Mitigation Research Project Capsule 241ST
    Ultra-High Performance Concrete (UHPC) Application in Link Slabs for Crack Mitigation: Research Project Capsule [24–1ST]
    Okeil, Ayman M. ;
    Rupnow, Tyson
    2024-06-01 | PDF
    The objective of this study is to explore the feasibility of using Ultra-High Performance Concrete (UHPC) in a bridge link slab for the purpose of producing crack-free continuity detail. This new link slab detail will employ a UHPC mix design that is suitable for Louisiana.
  • Reducing LowTemperature Cracking on Local Roads
    Reducing Low-Temperature Cracking on Local Roads
    Nazzal, Munir D ;
    Berner, William (Chris)
    2024-06-01 | PDF
    This report summarizes the research work that was completed to: 1) assess the effects of the properties of the aggregates, binders, RAP, and asphalt mixtures on low-temperature cracking resistance of mixes used on local roads, and 2) develop recommendations and specifications for designing low volume pavements that are more resistant to low-tempera ...
  • Traffic Safety Facts 2021 Data Race and Ethnicity
    Traffic Safety Facts 2021 Data: Race and Ethnicity
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-06-01 | PDF
    This fact sheet reports data on traffic fatalities by race and ethnicity, which might help develop countermeasures for those at risk. The term “race-ethnicity” is used to refer to the combined classification of race and ethnicity data. Of the 43,230 traffic fatalities in 2021, White people accounted for 50 percent while Black or African American pe ...
  • Methods for Maintaining Pavement Marking Retroreflectivity Video
    Methods for Maintaining Pavement Marking Retroreflectivity [Video]
    Peterson, Ethan ;
    Jackels, Jon
    2024-06-01 | MPEG
    To reduce highway fatalities after dark, the U.S. Federal Highway Administration (FHWA) issued new requirements for pavement marking “retroreflectivity” (the measure to which pavement markings reflect headlamp light back to its source). This standard has been incorporated into the Minnesota Manual on Uniform Traffic Control Devices (MN MUTCD) and a ...
    Supporting Files
  • Optical Fiber SensorEmbedded Strands for LongTerm Monitoring of PostTensioned Tendons in Bridge Elements
    Optical Fiber Sensor-Embedded Strands for Long-Term Monitoring of Post-Tensioned Tendons in Bridge Elements
    Williams, Christopher S ;
    Okumus, Pinar
    2024-06-01 | PDF
    Tendon forces are fundamental to the performance of post-tensioned (PT) bridges. Therefore, monitoring tendon forces is important for understanding the health of PT bridge elements and evaluating the condition of prestressing strands. Implementing a reliable method to monitor PT tendons during the service life of the structure, however, is a challe ...
  • Evaluation of AASHTO T 397 Standard Method of Test for Uniaxial Tensile Response of UltraHigh Performance Concrete Tech Transfer Summary
    Evaluation of AASHTO T 397, Standard Method of Test for Uniaxial Tensile Response of Ultra-High Performance Concrete [Tech Transfer Summary]
    Sritharan, Sri ;
    Gali, Sahith
    2024-06-01 | PDF
    The main objective of this study was to independently evaluate the reliability and repeatability of a tension test method for ultra-high performance concrete (UHPC) developed by the Federal Highway Administration (FHWA) and adopted by the American Association of State Highway and Transportation Officials (AASHTO) as AASHTO T 397.
  • Reducing Crash Risk at Work Zones in South Carolina
    Reducing Crash Risk at Work Zones in South Carolina
    Huynh, Nathan ;
    Madarshahian, Mahyar
    2024-06-01 | PDF
    This project investigated several aspects related to work zone safety. First, it examined the accuracy of the information recorded in the South Carolina (SC) traffic collision report forms (TR-310). A total of 200 fatal crashes in work zones between 2014 and 2020 were examined to determine how many discrepancies exist between the written narrative ...
  • Enhancing Collaboration Through WebBased Visualization and Analysis of Traffic Crash Data
    Enhancing Collaboration Through Web-Based Visualization and Analysis of Traffic Crash Data
    Zhang, Su ;
    Eshelman, Tyler A.
    2024-06-01 | PDF
    It is widely accepted that road traffic safety is a significant public health issue. One of the effective ways to improve road traffic safety is analyzing crash data to understand where traffic accidents occur, identify associated spatial and temporal patterns, and determine causation. In the State of New Mexico, locations of traffic accidents are ...
  • New Mix Design Method for HotMix ColdLaid Mixtures
    New Mix Design Method for Hot-Mix Cold-Laid Mixtures
    Chan, Kin Ming ;
    Zhou, Fujie
    2024-06-01 | PDF
    Hot-mix cold-laid (HMCL) asphalt mixes are crucial for maintaining asphalt pavements via blade-on/level-up patching. While the Superpave Gyratory Compactor (SGC) is widely used for hot-mix asphalt mixes due to its adjustable parameters and manageable compaction densities, the HMCL mix design still follows the Hveem mix design method, as per the Tex ...
  • Design Coefficients of Friction for MoDOT PTFE Bearings
    Design Coefficients of Friction for MoDOT PTFE Bearings
    Nejad, Saeed ;
    McGormley, Jonathan C.
    2024-06-01 | PDF
    This report evaluates the design coefficients of friction for polytetrafluoroethylene (PTFE) bearings, identifying key influencing parameters through a literature review and a detailed test program. Seven parameters were studied: PTFE material and surface types, size, contact pressure, temperature, sliding speed, and surface contamination. The anal ...
  • Complete Streets Speed Impacts
    Complete Streets Speed Impacts
    Savolainen, Peter T. ;
    Gates, Timothy J.
    2024-06-01 | PDF
    Recently, speed management practices have shifted away from an historical focus on the 85th percentile speed toward a safe systems approach that is focused on promoting safer speeds in all roadway environments through a combination of thoughtful, equitable, context-appropriate roadway design, appropriate speed-limit setting, targeted education, out ...
  • Best Practices for Maintenance of Traffic on Interstate Pavement Rehabilitation Projects
    Best Practices for Maintenance of Traffic on Interstate Pavement Rehabilitation Projects
    Keathley, Catherine ;
    Griffith, Ryan
    2024-06-01 | PDF
    Across the United States, aging roadway infrastructure has led state departments of transportation (DOTs) to increase their focus on pavement rehabilitation projects. These projects upgrade existing infrastructure to meet the needs of current levels of vehicle use. On interstate rehabilitation projects, maintenance of traffic (MOT) is an especially ...
  • Electrification of Illinois Transit Bridging the Gap with HeavyDuty Technician Training Initiatives
    Electrification of Illinois Transit: Bridging the Gap with Heavy-Duty Technician Training Initiatives
    Greenwood, Reggie ;
    Reddy, Meghana Reddy Dharma
    2024-06-01 | PDF
    This report examines the evolving landscape of technician training in Illinois’ transit industry, with a particular focus on electric vehicle (EV) technology. The report aims to identify the current challenges, explore collaborative training initiatives between community colleges and transit agencies, and provide actionable recommendations to the I ...
  • Development of a SMS Rollout Plan and Evaluation
    Development of a SMS Rollout Plan and Evaluation
    Dadi, Gabriel B. ;
    Nassereddine, Hala
    2024-06-01 | PDF
    Many state transportation agencies have introduced safety management systems (SMSs) to improve employee safety and health programs. These systems let employees quickly access safety and health policies, procedures, training, responsibilities, resources, and incident reporting tools, often electronically. Instituting a SMS is a critical step in adop ...
  • NJDOT Complete Streets Assessment
    NJDOT Complete Streets Assessment
    Hopwood, Cory ;
    Eskin, Ben
    2024-06-01 | PDF
    The New Jersey Department of Transportation (NJDOT) engaged Cambridge Systematics to research Complete Streets best practices and assess New Jersey’s existing Complete Streets activities. The Complete Streets concept is comprised of approaches to planning, designing, and operating roadways and rights-of-way with all road users in mind, making the t ...
  • Pedestrian Risk on Anishinaabe Reservations in Minnesota Overview and Phase 2 Results
    Pedestrian Risk on Anishinaabe Reservations in Minnesota: Overview and Phase 2 Results
    Lindsey, Greg ;
    Hourdos, John
    2024-06-01 | PDF
    Studies by the Federal Highway Administration show that American Indians have higher rates of pedestrian injury and death per capita than any other population group in the United States. The Minnesota Department of Transportation (MnDOT) has identified Native Americans as one of six priority populations in Minnesota that face disproportionate risks ...
  • Evaluate Geophysical Methods to Detect Underground Voids
    Evaluate Geophysical Methods to Detect Underground Voids
    Cai, Mingwei ;
    Li, Tairan
    2024-06-01 | PDF
    Four geophysical methods were comparatively assessed for their ability to detect subsurface anomalies/voids, namely, Electrical Resistivity Tomography (ERT), Multichannel Analysis of Surface Waves (MASW), Ground Penetrating Radar (GPR), and Full-Waveform Inversion (FWI). We found that: a. ERT is well-suited for detecting and localizing subsurface a ...
  • MobileDevice Data NonMotorized Traffic Monitoring and Estimation of Annual Average Daily Bicyclist and Pedestrian Flows
    Mobile-Device Data, Non-Motorized Traffic Monitoring, and Estimation of Annual Average Daily Bicyclist and Pedestrian Flows
    Barman, Simanta ;
    Levin, Michael W.
    2024-06-01 | PDF
    People who walk and bike are the most vulnerable road users. However, understanding where they walk and bike requires continual data monitoring. Traditional methods rely on physical sensors in the infrastructure to detect the presence of pedestrians and bicyclists. However, these are expensive to deploy and only detect road users at the specific lo ...
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