California Intersection Decision Support: A Driver-Centered Approach to Left-Turn Collision Avoidance System Design

This report focuses on two human factors studies which used an instrumented research vehicle to study driver behavior while making left turns. The first study focused on observing drivers’ intersection approaches and left-turn maneuvers in a mostly naturalistic setting. The instrumented vehicle recorded driver actions, such as approach speed, brake activation, steering inputs, and limited estimates of oncoming vehicle gap (and lag) acceptance. The second study examined left-turn gap (or lag) acceptance in an environment where gaps could be more accurately measured and tightly controlled. It also introduced drivers to the concept of a left-turn Driver Infrastructure Interface (DII), a dynamic, no-left-turn sign, warning sign.The vehicle approaches were timed to test the effects of different DII settings such as warning threshold onset timing on gap (lag) acceptance.


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 93p
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01091034
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Report/Paper Numbers: UCB-ITS-PRR-2008-1
  • Contract Numbers: TO 5600
  • Created Date: Mar 13 2008 4:11PM