The report is concerned with obtaining (a) estimates of the conspicuity of traffic control devices seen in ordinary road environments, and (b) an indication of the target object properties that determine conspicuity. The principal measure of the conspicuity chosen was the probability of seeing a target object under defined conditions of fixation, observation time, and a second measure was in terms of the order in which the objects were first noticed. Experiments were conducted using projected colour slides of 100 urban and semi-urban road scenes. It was found that traffic control devices were not conspicuous in the above terms. Few such devices achieved a detection probability of 0.90 or more in a 500ms observation period. Size was an important determinant of conspicuity, edge definition was also important. Brightness was less effective and white signs were noticed less frequently than coloured ones. Long observation periods were not effective in detecting additional signs. /Author/TRRL/

  • Corporate Authors:

    ARRB Group Ltd.

    Vermont South, Victoria  Australia 
  • Authors:
    • Cole, B L
    • JENKINS, S E
  • Publication Date: 1978-10

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 32 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00196705
  • Record Type: Publication
  • Source Agency: ARRB Group Ltd.
  • Report/Paper Numbers: Intern Rpt AIR 218-1Monograph
  • Files: ITRD, TRIS, ATRI
  • Created Date: Sep 29 1979 12:00AM