Tunnel-lighting : luminous intensity of luminaires to guide approaching drivers

概要

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An attempt was made to find the necessary luminous intensity values of the luminaires installed at a tunnel entrance in order to give optical guidance as to the run of the tunnel ahead to the vehicle driver approaching the tunnel entrance in daytime. A series of experimental observations were carried out under simulated conditions using a dynamic tunnel model. Through the observations, the necessary luminous intensity values for the luminaires were obtained in relation to both the luminance in the access zone (L 1) and the distance from the tunnel portal at which the driver perceived the luminaires. Discomfort glare caused by luminaires with the maximum luminous intensity necessitated above was checked and it was found that the glare effects are negligible.