The objectives of
tunnel lighting
The aims of tunnel lighting are:
• Firstly, to allow traffic to enter, pass through and exit the enclosed
section safely
• Secondly, to do so without impeding the through-flow of traffic.
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 negotiate their passage without
reducing speed.
These requirements apply during the day when the contrast between
outside and inside is significant and at night when it is less, but
reversed.