The Virginia Tech Transportation Institute (VTTI) conducts research to save lives, save time, save money and protect the environment. Researchers and students from multiple fields are continuously developing the techniques and technologies to solve transportation challenges from vehicular, driver, infrastructure and environmental perspectives.

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  • Improving Mobility for Rural Older Adults: A Program Review 

    Wotring, Brian; Antin, Jon (National Surface Transportation Safety Center for Excellence, 2020-08-07)
    The population of older adults is increasing and is expected to represent a larger proportion of the population over the next several decades. Those who live in rural areas face many transportation challenges, including a ...
  • Survive the Drive: A Guide to Keeping Everyone on the Road Alive 

    Dingus, Thomas A.; Buchanan-King, Mindy (Virginia Tech Publishing, 2020-06-15)
    Driving is risky business. Only cancer, heart attacks, and strokes cause more unintentional deaths among the general population. In this book, Tom Dingus, one of the foremost authorities on driving safety, tells you how ...
  • The Assessment of Alternative Overhead Sign Lighting 

    Williams, Brian; Gibbons, Ronald B. (National Surface Transportation Safety Center for Excellence, 2020-07-22)
    This report evaluates an alternative method for lighting highway signs that takes advantage of their retroreflective properties. This method uses a single luminaire mounted some distance upstream of the sign, with a focused, ...
  • Bicycle Visibility: Conspicuity of Bicycle Headlamps, Tail Lamps, and Retroreflective Garments in Nighttime Roadway Environments 

    Bhagavathula, Rajaram; Gibbons, Ronald B.; Williams, Brian; Connell, Caroline (National Surface Transportation Safety Center for Excellence, 2020-07-21)
    Cyclist deaths are overrepresented among traffic fatalities, and increasing cyclist conspicuity to drivers could potentially reduce cyclist deaths, particularly at night. This report describes an experiment with various ...
  • 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 ...

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