Through its local partner KOARIO, SEE Telecom delivered a complete system of radio retransmission in the 2-tubes tunnel to ensure the continuity of radio communications of some services, such as:

• TETRA network for the operating services of the A41 motorway
• RUBIS network - the nationwide network for the French Gendarmerie
• INPT - French national public security network
• Retransmission of 8 FM channels with the possibility to broadcast emergency messages.

The Mont-Sion tunnel is a road tunnel in the northern part of the A41 motorway in France operated by Eiffage Autoroutes Rhône-Alpes (AREA). The tunnel allows the crossing of the mountain of Sion at the level of the Mont-Sion pass located at an altitude of 785 meters.