Road Tunnels Manual

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8.4. Lighting

In the majority of tunnels the natural penetration of light does not allow satisfactory conditions of visibility for the users. It is therefore necessary to install artificial lighting offering satisfactory conditions of visibility and comfort to the users.

In terms of functionalities, the lighting installation must allow for:

  • A normal lighting that provides appropriate visibility to the users, day and night
  • A standby lighting that provides minimum visibility to the users for allowing them to leave the tunnel in their vehicles in case of power outage.

A lighting installation should be designed respecting several criteria, notably those relating to:

  • Level of luminosity and lighting on the pavement
  • Level of luminosity and lighting on the side walls and columns
  • Values of uniformity for the different operating regimens
  • Values of glare.

Several types of installations are possible; the most common are symmetrical lighting and counter-flow lighting. Depending on the characteristics of the tunnel and the objectives defined, the lighting fittings may be installed in one or more lines, above the road, on top of walls of the tunnel...

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