Design method for the lighting of tunnels based on the assessment of the veiling luminance. Contribution to the 5th European Light Congress V LUX Europa 1985, 9-11 September, 1985, Lausanne, Switzerland, Reports to the Conferences No. 16.

In usual low-land situations, the adaptation of the visual system of drivers /observers follows without an appreciable adaptation lag the changes in the luminance of the immediate surround. This luminance may be assessed by adding the intrinsic luminance of the actual objects which are observed and the veiling luminance caused by scatter of light in the media in between. This system is applied in several new and renovated tunnels in the Netherlands.