The purpose of this thesis is to establish and explore those characteristics of an object which make it conspicuous in a broad range of road traffic environments. A conspicuous object is defined as one that will be seen with certainty within a short observation time regardless of the location of the object in relation to the line of fixation. Of the various measures of visual conspicuity that were assessed, the most reliable and simple was the probability of detection of an object for a short observation time and fixed eccentricity. A series of experiments was carried out to explore those variables of object and background which affect conspicuity. The major conclusions of the thesis are that size and luminance contrast of an object are important determinants of its conspicuity. The boldness of any internal structure of an object will also contribute to making it conspicuous, however colour may not contribute importantly to an object's conspicuity but serves rather as a means of coding information. Size contrast is a more powerful determinant of conspicuity than luminance contrast. In the final chapter the findings from the schematic and road traffic backgrounds are brought together and reconciled. (TRRL)

  • Supplemental Notes:
    • Thesis was submitted in partial fulfilment of the requirements for admission to the degree of doctor of philosophy, University of Melbourne.
  • Corporate Authors:

    Melbourne University, Australia

    Department of Mechanical Engineering, Grattan Street
    Parkville, Victoria 3052,   Australia 
  • Authors:
    • JENKINS, S E
  • Publication Date: 1979-12

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 192 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00325288
  • Record Type: Publication
  • Source Agency: ARRB
  • Report/Paper Numbers: Monograph
  • Files: ITRD, TRIS, ATRI
  • Created Date: Aug 15 1981 12:00AM