VISIBILITY DURING NIGHT DRIVING ON UNLIGHTED ROADS

The visibility level necessary for the performance of a visual task is defined relative to the visibility reference function. This function, as at present proposed for use by The Commission International D'eclairage is to be considered illustrative only at background luminances below 1 cd/sq M. It may therefore not be representative of actual threshold values for visual tasks performed in this luminance region. Driving at night on unlighted roads with dipped beam is an example of such a task. It is shown that experimental data for this case indicate lower threshold values than those given by the visibility reference function. (A) /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00243426
• Corporate Authors:

  Illuminating Engineering Society

  York House, 199 Westminster Bridge Road
  London SE1 7UN,   England 
• Authors:
  • Hisdal, B
• Publication Date: 1977

Language

• English

Media Info

• Features: Figures; References;
• Pagination: p. 151-153
• Serial:
  • Lighting Research and Technology
  • Volume: 9
  • Issue Number: 3
  • Publisher: Sage Publications Limited
  • ISSN: 1477-1535
  • Serial URL: http://lrt.sagepub.com/

Subject/Index Terms

• TRT Terms: Brightness; Low beamed headlamps; Luminance; Night; Night visibility; Perception; Street lighting; Testing; Visibility
• Uncontrolled Terms: Thresholds
• Old TRIS Terms: Low beamed headlights
• ITRD Terms: 1340: Dipped headlight; 545: Lighting (street); 525: Luminance; 9052: Night; 2229: Perception; 6783: Visibility
• Subject Areas: Highways; Safety and Human Factors; I83: Accidents and the Human Factor;

Filing Info

• Accession Number: 00170301
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Jun 28 1978 12:00AM