For more than 10 years, practical experiments have been conducted in the Netherlands on the lighting of tunnel entrances. Common practice is to have the CIE recommended illuminance value of approximately 10000 lux installed under the most difficult conditions (i.e. in summertime at noon with bright sunshine or a lightly clouded sky with a very high luminance). The very high illuminance value of 10000 lux is criticised by theoreticians and also government officials who try to prove by a theoretical approach, that the recommended value is exaggerated. The authors believe that this is a form of self deception, as the only reason for reducing the level of lighting is an economic one. Experiments in the Netherlands demonstrate that instead of 10000 lux, an illumination level of approximately 30000 lux is necessary to guarantee good visibility and safe driving in the tunnel entrance. This paper gives a detailed description of these experiments and the consequent results. An illumination system using a new type of grid arrangement is discussed. The paper ends with some conclusions for different types of tunnel. (TRRL)

  • Availability:
  • Corporate Authors:

    Noord Nederlandse Drukkerij

    Eendrachtstraat 2, Postbus 6
    Meppel,   Netherlands 
  • Authors:
    • Tan, T H
    • SWART, L
  • Publication Date: 1983-9


  • Dutch

Media Info

  • Features: Figures; Photos; Tables;
  • Pagination: p. 669-675
  • Serial:
    • Elektrotechniek
    • Volume: 61
    • Issue Number: 9
    • Publisher: NV Noord Nederlandse Drukkerij
    • ISSN: 0013-4627

Subject/Index Terms

Filing Info

  • Accession Number: 00382679
  • Record Type: Publication
  • Source Agency: Institute for Road Safety Research, SWOV
  • Files: ITRD, TRIS
  • Created Date: Apr 30 1984 12:00AM