The 12.87 km Fréjus road tunnel, commissioned in 1980, is located at the junction of two major national and international trade routes between France and Italy. Key link between the Savoie and the Piedmont, it is one of the main road routes for crossing the northern Alps. It consists of a single two-way tube with two lanes of traffic.
The Fréjus tunnel is designed for heavy goods traffic with a maximum height of 4.3 metres. A single tube accommodates two 3.55-metre lanes of traffic. The French and Italian portals of the tunnel are at similar altitudes, respectively 1,228 and 1,297 metres. The longitudinal profile has a slight slope of 0.54 % in the direction France-Italy.