Detection distances were reported for road signs of different reflective intensity, colour and size perceived under varying light conditions during field experiments in night driving. If the reflective intensity of a material (irrespective of colour) was greater than 1 mcd/ sq, the median and 90th percentile detection distances for dipped headlights were at least about 700 M and 400 M respectively. For high beam lights all materials had medians of 1000 M or more. Increasing the area of a sign by a factor of 2 had the same effect on detection distance (about 175 M) as an increase of reflective intensity from about 1 mcd/ sq to 2 mcd/ sq. Dipped headlights from an oncoming car decreased detection distances of the signs by about 80-120. /TRRL/

  • Corporate Authors:

    Gothenburg University, Sweden

    Kulturgeografiska Institutionen, Fack
    Gothenburg,   Sweden 
  • Authors:
    • Bahlstedt, S
    • SVENSON, O
  • Publication Date: 1976

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 9 p.
  • Serial:
    • Volume: 6
    • Issue Number: 4

Subject/Index Terms

Filing Info

  • Accession Number: 00147913
  • Record Type: Publication
  • Source Agency: Swedish National Road and Traffic Research Institute
  • Report/Paper Numbers: Monog Ser.
  • Files: ITRD, TRIS
  • Created Date: Aug 15 1977 12:00AM