A study is presented in which two indicators for visual workload of the driver are measured in an instrumented car while driving on a four- and six lane freeway. For one-minute periods during which the car passed inductive loops in the road surface, a parameter was computed which is assumed to correlate with traffic safety. This is the weighed Time-to-Collision (TTC). The resesarch question in this report is whether visual workload of the driver, which is also assumed to be related to traffic safety, correlates with weighed localized TTC. If so, this would open the possibility of assessing traffic safety from inductive loop data. In an experiment, which involved twenty subjects, half of the subjects performed a visual detection task which was secondary to driving. Performance on this task is a good indicator for visual workload. The other half of the subjects drove the route without performing a secondary task and a measure for frequency of steering movements was taken as indicator for their visual workload. However, thelimited set of data was too low for firm conclusions.

  • Corporate Authors:

    TNO Human Factors Research Institute

    Kampweg 5, P.O. Box 23
    Soesterberg,   Netherlands  3769 ZG
  • Authors:
    • Verwey, W B
    • HEIJER, T
  • Publication Date: 1994


  • English

Media Info

  • Features: References;
  • Pagination: 17 p.
  • Serial:
    • Issue Number: TNO-TM 1994 C-42

Subject/Index Terms

Filing Info

  • Accession Number: 00722978
  • Record Type: Publication
  • Source Agency: Institute for Road Safety Research, SWOV
  • Files: ITRD
  • Created Date: Jul 26 1996 12:00AM