STRAYLIGHT, CONTRAST SENSITIVITY AND THE CRITICAL OBJECT IN RELATION TO TUNNEL ENTRANCE LIGHTING

The black hole effect for tunnel entrances can be avoided by making the entrance lighting competitive with ambient straylight. The latter is usually calculated with the Stiles-Holladay formula for intra-ocular scatter. It is argued that it produces a gross underestimation for four reasons: the S-H formula does not apply to tunnel geometry, no age factor was taken into account, and straylight from atmosphere and windscreen was neglected. Current CIE proposals on tunnel-entrance lighting will evidently fall short if a revaluation of the "critical object" concept is not undertaken. (TRRL)

  • Supplemental Notes:
    • This paper was presented at the 20th session of the CIE, International Commission on Illumination, held in Amsterdam, August 31-September 8, 1983, Volume 1, D404.
  • Corporate Authors:

    Bureau Cent de la commission Intl de l'Eclairage

    52 Boulevard Malsherbes
    Paris,   France 
  • Authors:
    • Vos, J J
    • Padmos, P
  • Publication Date: 0

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Filing Info

  • Accession Number: 00385208
  • Record Type: Publication
  • Source Agency: Institute for Road Safety Research, SWOV
  • Files: ITRD, TRIS
  • Created Date: May 30 1984 12:00AM