In tunnels SIDEis is able to perform 3 functions:

1. Primarily functional lighting, meeting the regulatory requirements of  
   • luminance, general, longitudinal and transverse uniformity on the carriageway,
   • luminance, and uniformity on the wall up to 160cm from the ground;  
2. illuminating the lateral platform which is now illuminatd by the pickets;
3. the step marker, possibly adding green light signal modules.

In the event of smoke in the tunnel, the benefits of a light emitted laterally from below are similar to those we have seen in case of fog:

• makes the fog wall 8 times lower,
• is under the field of vision,
• delimits the perimeter of the road.