Now showing items 1-20 of 528

    • Consumer Driving Automation System Education: A Learning and Retention Assessment 

      Trimble, Tammy E.; Baker, Stephanie; Russell, Sheldon; Tidwell, Scott (National Surface Transportation Safety Center for Excellence, 2020-07-08)
      For the potential safety benefits of driving automation systems to be fully realized, drivers must understand the capabilities and limitations of these systems. This study explored a range of materials that drivers may ...
    • Does the Interaction between Vehicle Headlamps and Roadway Lighting Affect Visibility? A Study of Pedestrian and Object Contrast 

      Bhagavathula, Rajaram; Gibbons, Ronald B.; Nussbaum, Maury A. (SAE International, 2020-04-14)
      Vehicle headlamps and roadway lighting are the major sources of illumination at night. These sources affect contrast-defined as the luminance difference of an object from its background-which drives visibility at night. ...
    • Identification of Railroad Requirements for the Future Automated and Connected Vehicle (AV/CV) Environment 

      Morgan, Curtis A.; Warner, Jeffery E.; Lee, Dahye; Florence, David (SAFE-D: Safety Through Disruption National University Transportation Center, 2020-06)
      The Federal Rail Administration (FRA) Highway-Rail Grade Crossing Inventory database from 2019 states that there are approximately 127,000 public, at-grade highway-rail grade crossings in the U.S. Despite this large number ...
    • Impact of Intersection Control on Battery Electric Vehicle Energy Consumption 

      Ahn, Kyoungho; Park, Sangjun; Rakha, Hesham A. (MDPI, 2020-06-19)
      Battery electric vehicle (BEV) sales have significantly increased in recent years. They have different energy consumption patterns compared to the fuel consumption patterns of internal combustion engine vehicles (ICEVs). ...
    • Empirical Study of Effect of Dynamic Travel Time Information on Driver Route Choice Behavior 

      Wang, Jinghui; Rakha, Hesham (MDPI, 2020-06-08)
      The objective of this paper is to study the effect of travel time information on day-to-day driver route choice behavior. A real-world experimental study is designed to have participants repeatedly choose between two ...
    • Virtual Reality as a Tool to Evaluate Pedestrian Safety 

      Bhagavathula, Rajaram; Williams, Brian; Owens, Justin; Gibbons, Ronald B. (National Surface Transportation Safety Center for Excellence, 2020-06-25)
      Virtual reality (VR) promises to be an effective tool to evaluate changes to the built environment that could improve safety for pedestrians. However, in order to draw actionable conclusions from VR, it is important to ...
    • Safety Countermeasures at Unsignalized Intersections – A Toolbox Approach 

      Li, Eric; Medina, Alejandra; Gibbons, Ronald B. (National Surface Transportation Safety Center for Excellence, 2020-06-23)
      In 2015, approximately 8,000 intersection and intersection-related fatal crashes occurred on the nation’s highway system, resulting in more than 8,400 fatalities. That death toll represented about 24% of the traffic-related ...
    • Exploring Crowdsourced Monitoring Data for Safety 

      Turner, Shawn; Martin, Michael; Griffin, Greg; Le, Minh; Das, Subasish; Wang, Ruihong; Dadashova, Bahar; Li, Xiao (SAFE-D: Safety Through Disruption National University Transportation Center, 2020-03)
      This project included four distinct but related exploratory studies of data sources that could improve roadway safety analysis. The first effort evaluated passively gathered crowdsourced bicyclist activity data from ...
    • Formalizing Human Machine Communication in the Context of Autonomous Vehicles 

      Gopalswamy, Swaminathan; Saripalli, Srikanth; Shell, Dylan; Hickman, Jeff; Hsu, Ya-Chuan (SAFE-D: Safety Through Disruption National University Transportation Center, 2020-05)
      There are many situations where tacit communication between drivers and pedestrians governs and enhances safety. The goal of this study was to formalize this communication and apply it to the driving strategy of an autonomous ...
    • Standardized Performance Evaluation of Vehicles with Automated Capabilities 

      Basantis, Alexis; Harwood, Leslie; Doerzaph, Zachary; Neurauter, Luke (SAFE-D: Safety Through Disruption National University Transportation Center, 2019-12)
      Advanced driver-assistance systems (ADAS) are becoming widely available in the new vehicle landscape, increasing of both vehicle occupants’ and other road users’ safety. In some vehicles, longitudinal and lateral positioning ...
    • Vehicle-width Measurement Technology Development: Phase I Technical Memorandum 

      Marinik, Andrew; Trimble, Tammy E.; Baker, Stephanie; Bryson, Jared; Schaudt, William A.; Bowman, Darrell (Virginia Center for Transportation Innovation and Research, 2011-08)
      The Virginia Tech Transportation Institute (VTTI) was tasked with investigating the feasibility of developing a vehicle-width measurement and alert system to reduce over-width violations in Virginia Department of ...
    • Draft Final Report: Development of Hazardous Materials (HM) Shipper Prioritization Program 

      Schaudt, William A.; Bowman, Darrell; Marinik, Andrew; Baker, Stephanie; Trimble, Tammy; Hanowski, Richard J. (Virginia Tech Transportation Institute, 2009-02-28)
      In the mid-1990s, an attempt was made to develop a performance-based prioritization for Hazardous Materials (HM) shippers. During this attempt it became apparent that there was insufficient performance data to develop such ...
    • Field Evaluation of Alternative Automated Systems for Reducing Illegal Passing of School Buses, DTNH22-00-07007, Task Order 1 

      Hanowski, Richard J.; Spaulding, Jeremy M.; Gaskins, Charla; Schaudt, William A.; Miller, Steven; Holbrook, Thomas; Olson, Rebecca L.; Dingus, Thomas A.; Hickman, Jeffrey; Huey, Richard; Llaneras, Eddy E. (Virginia Tech Transportation Institute, 2007-03-27)
      The overall objective of this research was to develop a prototype system that would automatically detect and record vehicles that illegally pass stopped school buses. There were four primary steps in meeting this objective: ...
    • Development of Hazardous Materials (HM) Shipper Prioritization Program: Technical Brief 

      Marinik, Andrew; Schaudt, William A.; Daily, Brian; Bowman, Darrell; Hanowski, Richard J. (Virginia Tech Transportation Institute, 2009-02)
      The Federal Motor Carrier Safety Administration (FMCSA) developed the Hazardous Materials Package Inspection Program (HMPIP) to focus on inspecting individual shipments at the roadside or on carriers’ docks. One output of ...
    • Enhanced Rear Signaling (ERS) for Heavy Trucks: Phase III – Development of Field Operational Test 

      Schaudt, William A.; Bowman, Darrell S.; Trimble, Tammy E.; Medina, Alejandra F.; Bocanegra, Joseph; Baker, Stephanie; Marinik, Andrew; Wierwille, Walter W.; Hanowski, Richard J. (Virginia Tech Transportation Institute, 2010-09)
      The Enhanced Rear Signaling (ERS) for Heavy Trucks project was directed at investigating methods to reduce or mitigate those crashes where a heavy truck has been struck in the rear by another vehicle. Prior to the current ...
    • Data Sharing Across Borders: Current Status 

      Lee, Suzanne; Hankey, Jonathan M. (National Surface Transportation Safety Center for Excellence, 2020-05-28)
      This report is the culmination of several years of Virginia Tech Transportation Institute (VTTI) involvement in international collaborations in the field of transportation research. The sponsor of this report, the National ...
    • Pre-Employment Screening Best Practices in the Commercial Motor Vehicle Industry 

      Mabry, J. Erin; Hickman, Jeffrey S.; Glenn, T. Laurel (National Surface Transportation Safety Center for Excellence, 2020-05-22)
      This study documents innovative and successful practices for pre-employment screening in the commercial motor vehicle (CMV) industry and assesses the prevalence and effectiveness of these pre-employment screening practices ...
    • Effects of Mounting Height, Offset Distance, and Number of Light Towers on Drivers' Visual Performance and Discomfort Glare in Work Zones 

      Bhagavathula, Rajaram; Gibbons, Ronald B. (SAGE, 2018-12-01)
      Portable light towers are a significant source of glare to motorists entering a work zone. Although existing research has evaluated the effect of light tower orientation on visibility and glare, the effects of factors like ...
    • Effect of Intersection Lighting Design on Drivers' Perceived Visibility and Glare 

      Bhagavathula, Rajaram; Gibbons, Ronald B.; Nussbaum, Maury A. (SAGE, 2019-02-01)
      A systems-level approach to intersection lighting design has shown that illuminating the intersection box increases drivers’ nighttime visual performance. However, for an intersection lighting design to be effective and ...
    • Light Levels for Parking Facilities Based on Empirical Evaluation of Visual Performance and User Perceptions 

      Bhagavathula, Rajaram; Gibbons, Ronald B. (Taylor & Francis, 2020-04-02)
      Light levels recommended for parking facilities should be backed by empirical research that accounts for all users. In the current study, pedestrians’ and drivers’ visual performance and their perceptions of safety, comfort, ...