ROADWAY LIGHTING SPECIFICATION BASED ON SAFE TRAFFIC NEEDS

The new road design manual entitled "Geometric Design Standards for Canadian Roads and Streets" published by the Roads and Transportation Association of Canada (RTAC) features, among other changes, a completed revised section on roadway illumination. These new Canadian lighting standards incorporate both illuminance and luminance methods of calculations and suggest design criteria including luminance and illuminance levels, uniformity and glare control. The design criteria is based mainly on traffic safety needs. However, energy conservation and system operation economics are also discussed. The latter problem is described in terms of light and maintenance procedures. Prior to the establishment of the new standardized methods and the design criteria and extensive investigation of lighting needs for Canadian conditions was carried out. This project was sponsored by Transport Canada and conducted by Fenco Consultants Ltd as the research agency. The lighting quantitative needs in the new Canadian standards were based on detectability of critical-size objects at a safe stopping sight distance. For freeway class roads it was determined that effective visibility conditions can be achieved with luminance levels of 0.8 cd/sq sq m. By recognizing both luminance and illuminance as integral components of lighting system design procedures, it is suggested that such an approach enables the designer to assess more accurately the total illumination potential.

  • Availability:
  • Supplemental Notes:
    • This paper was presented at the 8th IRF World Meeting, Tokyo, Japan, October 16-21,. 1977. Full text also written in Japanese.
  • Corporate Authors:

    International Road Federation

    525 School Street, SW
    Washington, DC  United States  20024
  • Authors:
    • Ketvitris, A
    • Wienstein, W
    • Cooper, P J
  • Publication Date: 1977-10

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Filing Info

  • Accession Number: 00179839
  • Record Type: Publication
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Oct 12 1978 12:00AM