This article describes a new simplified method for designing road tunnel lighting which enables designers to achieve a theoretical approach similar to that used by the centre d'etudes des tunnels (cetu). This simplified method allows lighting levels at tunnel entrances to be adapted to take into account the difficult lighting conditions met by the driver such as the veiling luminances caused by atmospheric dust or fog, or windscreen luminance. Spatial and temporal visual adaptation are also taken into account. Photometric measurements are limited to assessing the variation of lfry (fry veiling luminance), or more simply, the average luminance over the 20 degree field of view in the tunnel approach zone. The results obtained using this method are compared with those obtained using conventional cetu methods and are found to correlate well. The simplified method is illustrated by analysing the lighting at two sites: (a) a tunnel in a mountainous area; and (b) a tunnel located in an open site.

  • Availability:
  • Corporate Authors:

    Chartered Institution of Building Services Engineers

    Delta House, 222 Balham High Road
    London SW12 9BS,   England 
  • Authors:
    • TESSON, M
    • Monie, B
  • Publication Date: 1989


  • English

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Filing Info

  • Accession Number: 00498459
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS, ATRI
  • Created Date: Sep 30 1990 12:00AM