Glare and tunnel entrance lighting : Effects of straylight from eye, atmosphere and windscreen
article
Straylight components from the observer's eye, the atmosphere and the car windscreen form together a luminous veil that reduces the visibility of objects in the entrance of long tunnels, unless its light level is high enough. Through field and laboratory measurements and model calculations the luminance of the three components has been related to a common parameter of the light level outside the tunnel. It appeared that the straylight luminance is much higher than assumed until now. The consequences for the required entrance lighting level are discussed and in relation to this the problem of assessing the intrinsic contrast of objects in the entrance that have to be perceived by the approaching driver.
Topics
TNO Identifier
5982
Source
CIE Journal, 3(1), pp. 1-24.
Pages
1-24
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