The primary objectives of tunnel lighting is to ensure traffic safety by illuminating all important objects during the journey of vehicles, and to improve visibility and comfort. Proper lighting in road tunnels will ensure that traffic can enter, pass through and leave the tunnel with a great level of safety. These aims are achieved by the adequate illumination of the tunnel interior, which allows drivers to quickly adjust to the light within, identify possible obstacles, and manage to leave the tunnel without reducing speed.
For that purpose, it is compulsory that the carriageway and the tunnel walls give a clear picture of the road. The road markings and stripes should also be visible, and tunnel lighting should ensure that objects on the road are visible at a sufficient distance.
Lighting must then ensure an adequate luminance level on the road, throughout the tunnel, and that luminance ha to be distributed uniformly on the road, in wet or in dry conditions. The lighting should not give rise to glare. Read more