MEASURES OF VISIBILITY AND VISUAL PERFORMANCE IN ROAD LIGHTING

At present, road lighting is designed on the basis of recommended values of light technical parameters. Implicit in these recommendations is the notion that objects and the carriageway must be made visible at night for safe traffic conditions. The viability of present practice is reflected in the success of road lighting as an accident countermeasure. Further advances in the analysis of road lighting have been attempted by various investigations into the concepts of visibility and visual potential. These are critically examined in this report. It is concluded that a general concept of visibility has not been attained, since current metrics of visibility are based only on the contrast attributes of simple objects. Neither has it been demonstrated that increasing the complexity of lighting design through basing it on visual potential is warranted. /Author/TRRL/

  • Availability:
  • Corporate Authors:

    ARRB Group Ltd.

    Vermont South, Victoria  Australia 
  • Authors:
    • HALL, R R
    • FISHER, A J
  • Publication Date: 1978

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00182723
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 0 86910 304 0
  • Report/Paper Numbers: Res Rpt. ARR No. 74 Monograph
  • Files: ITRD, TRIS, ATRI
  • Created Date: Nov 14 1978 12:00AM