Visual Demand of Curves and Fog-Limited Sight Distance and Its Relationship to Brake Response Time

Driver distraction is a major contributing factor to automobile crashes. National Highway Traffic Safety Administration (NHTSA) has estimated that approximately 25% of crashes are attributed to driver distraction and inattention (Wang, Knipling, & Goodman, 1996). The issue of driver distraction may become worse in the next few years because more electronic devices (e.g., cell phones, navigation systems, wireless Internet and email devices) are brought into vehicles that can potentially create more distraction. In response to this situation, the John A. Volpe National Transportation Systems Center (VNTSC), in support of NHTSA's Office of Vehicle Safety Research, awarded a contract to Delphi Electronics & Safety to develop, demonstrate, and evaluate the potential safety benefits of adaptive interface technologies that manage the information from various in-vehicle systems based on real-time monitoring of the roadway conditions and the driver's capabilities. The contract, known as SAfety VEhicle(s) using adaptive Interface Technology (SAVE-IT), is designed to mitigate distraction with effective countermeasures and enhance the effectiveness of safety warning systems. The report submitted herein is a final report for Task 2 that documents the research progress to date (March 2003-March 2004) in Phase I. In this report, the major results from the literature review are summarized to determine the research needs for the present study, the experimental methods and resultant data are described, diagnostic measures and preliminary algorithms are identified, and human factors recommendations are offered. To determine the relationship between visual demand and brake response time, subjects drove a two-lane rural road in the UMTRI simulator, sometimes following a lead vehicle that braked. The road consisted of straight and curved sections with varying sight distances (due to fog), and therefore visual demand varied. Visual demand was measured using the visual occlusion method and by ratings.


  • English

Media Info

  • Media Type: Web
  • Features: Appendices; Figures; References; Tables;
  • Pagination: 69p

Subject/Index Terms

Filing Info

  • Accession Number: 01149519
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 21 2010 4:07PM