Road lighting installations must be optimised so that the greatest possible gains in traffic safety, visibility, environmental perception, etc., are achieved in relation to initial and running costs. The most significant factors relating to illumination quality are 1. Mean luminance of carriageway, 2. Uniformity of luminance, 3. Illumination some way outside the carriageway, 4. Absence of glare, 5. Visual guidance. Design is carried out by using combinations of light source, light distribution, spacing and placing as input data for a computer program. The results are adapted to standard column sizes. Up to 25% of the cost can be saved by employing this design method. Development work is in progress on programs so that input data may comprise 1. Alternative distribution spectra, 2. Different light sources, 3. Different road surfacing reflectivities, 4. The cost of installation components, 5. Standard column dimensions. Optimisation calculations should also comprise, as input data, 6. Lighting engineering quality factors, 7. Surfacing type, 8. Road cross section, 9. Distance of column from carriageway, 10. Any restrictions. /TRRL/

  • Corporate Authors:

    Engwall and Strahle AG

    Brunkebergstorg 20/4
    Stockholm C,   Sweden 
  • Authors:
    • Odemark, B
  • Publication Date: 1975


  • Swedish

Media Info

  • Features: Figures; Tables;
  • Pagination: p. 35-36
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00132250
  • Record Type: Publication
  • Source Agency: Swedish National Road and Transport Research Institute (VTI)
  • Files: ITRD, TRIS
  • Created Date: Jul 13 1976 12:00AM