Ensuring the safety of motorists in tunnels is a priority for public bodies responsible for road maintenance and public works companies entrusted with renovation and modernization programs. Indeed, these confined spaces can be particularly dangerous in the event of a fire because users who are not in the immediate vicinity of the incident often tend to underestimate its extent. Because they only see smoke, many motorists do not have the reflex to leave their car and exit the tunnel through the emergency exits. However, asphyxiation is one of the primary risks in the event of a fire. The challenge is therefore to make motorists understand that they must leave their vehicle as quickly as possible, using visual and audible signals that will direct them to safe locations.
It is within the framework of several programs to modernize structures that A2S has won major contracts to supply high-power audible warning devices. Thus, in the Lyon region, A2S, which had first equipped the Croix Rousse Tunnel , was selected by SPIE to equip the Fourvière Tunnel with 22 high-power sirens. In the Ile de France region, the Roads Department has also launched a modernization program, covering 22 La Défense Tunnels . It concerns safety management, ventilation, incident detection, evacuation and fire resistance. At the end of this work, these tunnels will be among the most modern in Europe. A2S has signed a framework agreement with Bouygues SA for the supply of all the audible warning devices for this program.