THE IN SITU MEASUREMENT OF ROAD REFLECTION

This paper describes a procedure that has been designed to measure P(0;0), P(2;0) and P(1;90), the three values that are the basis for the C1-C2 system for measuring road reflection of light. The system was proposed in The Netherlands, and subsequently adopted by the CIE as an alternative to the Qo-kappa system. The function P(x;y) is the luminance factor as commonly defined, but divided by pi = 3.14159..., x is the tangent of the angle of incidence in the plane of observation, and y is the angle in degrees in the plane perpendicular to the plane of observation. The three specific P-values can easily be measured in a laboratory, using samples cut out from the road. The reflection properties of road surfaces were also measured on-site, as part of a project to establish an optimal design and maintenance system for the lighting system in a medium-sized Dutch city and to optimise its public lighting in terms of energy. Five roads with a traffic function were selected for this test. Their classes were assessed, their reflections were measured using a prototype of the C1-C2 system, a lighting installation was designed to allow the recommended luminance levels, and the calculated and observed power levels were compared. The results are given in a table.

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  • Corporate Authors:

    INSTITUTION OF LIGHTING ENGINEERS

    LENNOX HOUSE, 9 LAWFORD RD
    Rugby, Warwickshire,   United Kingdom 
  • Authors:
    • SCHREUDER, D A
  • Publication Date: 1994-2

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 11-3
  • Serial:
    • LIGHTING JOURNAL
    • Volume: 59
    • Issue Number: 1
    • Publisher: INSTITUTION OF LIGHTING ENGINEERS
    • ISSN: 0950-4559

Subject/Index Terms

Filing Info

  • Accession Number: 00665404
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Sep 9 1994 12:00AM