Now showing items 1-6 of 6

    • 4U Lighting – Cooperative Headlighting 

      Palmer, Matthew; Tsuda, Hiroshi; Williams, Brian; Gibbons, Ronald B. (National Surface Transportation Safety Center for Excellence, 2019-10-31)
      The purpose of this project was to evaluate the effectiveness of an alternative cooperative headlighting method, dubbed 4U Lighting. A human-subjects study was conducted in which 12 participants 65 or older observed ...
    • Active and Adaptive Roadway Delineation Systems 

      Williams, Brian; Gibbons, Ronald B.; Flintsch, Alejandra Medina (National Surface Transportation Safety Center for Excellence, 2017-10-13)
      Heavy fog presents a significant safety hazard to drivers by reducing their ability to see the roadway and other vehicles. Even so, drivers often fail to adjust their speed to account for the reduced visibility, resulting ...
    • 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 ...
    • Pedestrian Visibility in Roundabouts: Naturalistic Study of Driver Eye-Glance Behavior 

      Bhagavathula, Rajaram; Williams, Brian; Gibbons, Ronald B. (National Surface Transportation Safety Center for Excellence, 2019-04-16)
      Roundabouts increase safety, but their safety effects on vulnerable road users are not as great as the safety effects for motor-vehicle drivers. Additionally, many motorists fail to yield to pedestrians at intersections ...
    • 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 ...