About 30% of all injuries, and 35-40% of all fatal injuries, occur in the dark. The increased accident hazard in the dark depends on many factors, the principal one being reduced visibility. Remedial measures can relate either to road users, vehicles or the road itself (stationary lighting). One method of determining the best lighting quality is analysis of the need for visual information, and another subjective appraisal. Lighting must enable road users to see an obstacle on or near the road, and also the line of the road. There must be a certain difference in luminance between an obstacle and the background, for it to be seen. The mean luminance of the carriageway on motorways should normally be 2 cd/m squared, and on lesser roads 0.5 cd/m squared. Luminance must also be uniform; uniformity is satisfactory if lmin/lmed > 0.4; for motorways and major roads, lmin/lmax should be greater than or equal to 0.7. Road lighting must not cause glare; fittings are a mixture of cut-off, semi-cut-off and non-cut-off types. There must also be visual guidance so that the road user has constant information on alignment and areas where conflicts with other road users may arise. /TRRL/

  • Availability:
  • Corporate Authors:

    Svenska Vag-Och Vattenbyggaren Riksforband

    Regeringsgaten 98
    S-11139 Stockholm,   Sweden 
  • Authors:
    • Hedman, K O
  • Publication Date: 1974


  • Swedish

Media Info

  • Features: Figures; Photos; References;
  • Pagination: 4 p.
  • Serial:
    • Vag-Och Vattenbyggaren
    • Issue Number: 5
    • Publisher: Svenska Vag-Och Vattenbyggaren Riksforband
    • ISSN: 0042-2177

Subject/Index Terms

Filing Info

  • Accession Number: 00125153
  • Record Type: Publication
  • Source Agency: Swedish National Road and Traffic Research Institute
  • Files: ITRD, TRIS
  • Created Date: Nov 18 1975 12:00AM