COMPUTER PROGRAM FOR ROADWAY LIGHTING

The development of a computer program for the design and evaluation of fixed highway lighting is reported. The program calculates the illuminance, luminance, and disability veiling brightness in each lane at specified grid points on the road surface for regular, straight rows of luminaires, for a straight highway up to six lanes wide. Isoilluminance and isoluminance diagrams can also be obtained. The progam can be used as a design tool in the following way: For a chosen road geometry and a selected luminaire type, the designer can determine the performance of a proposed lighting design by calculating the relevant performance measures and comparing the results with the current accepted, or the proposed new standards. Many different designs can be rigorously evaluated in a short time. In conjunction with photometric measurements, the program was used to evaluate the performance of the existing design on the Toronto Bypass. Lighting designs based on calculations of luminance and disability veiling brightness are preferable to those based on illuminance because nighttime visibility is determined by the former rather than the latter. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 25-32
  • Monograph Title: Lighting, visibility and railroad-highway grade crossings
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00168079
  • Record Type: Publication
  • ISBN: 0309026539
  • Report/Paper Numbers: HS-022 157
  • Files: TRIS, TRB
  • Created Date: Jan 30 1978 12:00AM