The Bois Clair tunnel is a former railway tunnel and is the longest tunnel in France now open to a Voie Verte (1.6 km). Fully lit, it takes 4 to 6 minutes to go through on a bike, 6 to 10 minutes on rollerblades and 15 to 20 minutes on foot.
The temperature is around 11° C. This tunnel is home to protected species of bats, so it is closed during the hibernation period (October to April).
The annual closure of the Bois Clair tunnel will be brought forward exceptionally in order to carry out work to modify the lighting system and the electrical installation. This will be effective from September
A route around the tunnel is then proposed by taking the loop n°14 (4km level: expert)