A procedure for measuring the attentional demand of the road on the driver was proposed by Senders et al in 1966. The method limits the driver's opportunity to sample the road scene ahead by the use of a mechanical visual occluding device. The driver then must establish the visual sampling rate necessary to control the vehicle to the criterion of performance specified by the experimenter. The experiment reported here used this visual interruption procedure to compare the visual sampling requirements of drivers in day and night conditions under two levels of driving task demand. The roadway used was a 2.1 km length of freeway that was not yet opened to traffic. The time between visual samples was shown to depend on the visibility conditions. Night trials yielded shorter times between looks than did trials under daylight conditions. Greater emphasis on accuracy in the driving task also led to higher visual sampling rates. Sequential effects in the time between looks were found when the sampling rates were lower, but not under the high sampling rate conditions. The results suggest that the method has potential for assessing the effect of changes in road delineation systems. /TRRL/

  • Supplemental Notes:
    • The paper was presented at the 15th Annual Conference of the Ergonomics Society of Australia and New Zealand, University of Melbourne, 1978. It is also issued as Australian Road Research Board Internal Report AIR 266-1.
  • Corporate Authors:

    Monash University

    Wellington Road
    Clayton, Victoria  Australia  3800
  • Authors:
    • Triggs, T J
    • Caple, D C
  • Publication Date: 1978

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 22 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00300262
  • Record Type: Publication
  • Source Agency: ARRB Group Ltd.
  • Files: ITRD, TRIS, ATRI
  • Created Date: Oct 17 1979 12:00AM