The contract concerns the heavy and light periodic maintenance services of the ventilation systems of motorway tunnels operated by the companies APRR AREA and ADELAC. Light maintenance - on-site interventions, visual checks and routine maintenance Heavy maintenance - dismantling of accelerators / fans and overhaul of motors in the workshop then reassembly in situ.

The services consist in carrying out heavy and light maintenance operations on accelerators in tunnels, fresh air fans and extractors of stale air in ventilation plants, and smoke extraction hatches in galleries for the Maurice Lemaire tunnel.As an indication, the scope of intervention covers the Maurice Lemaire Tunnel linking Ste Marie to Mines(68) and Lusse (88); bi-directional single-tube structure with a length of 6.9 km and the ventilation plants attached.

The services consist of carrying out heavy and light maintenance operations on accelerators in tunnels, fresh air fans and extractors of stale air in ventilation plants, and smoke extraction hatches in galleries for tunnels on the A40 motorway. As an indication, the perimeter of intervention covers the structures of Chatillon (2 x 720m), St Germain (2 x 1,200m) and Chamoise (2 x 3,300m) on A40 for a total of 10,432ml of roads; Each of these 3 structures is composed of 2 unidirectional tubes with 2 lanes of traffic.

The services consist of carrying out heavy and light maintenance operations for tunnel accelerators, fresh air fans and stale air extractors in ventilation plants, and smoke extraction hatches in galleries for tunnels in the networks operated by AREA and ADELAC. As an indication, the perimeter of intervention covers the structures of Dullin (A43 - 2 x 1,600m), Epine (A43 - 2 x 3,200m), Sinard (A51 - 1 x 995m), Uriol (A51 - 2 x 490m), Petit Brion (A51 - 2 x 595m) and Mont Sion (A41 - 2 x 3,100m) for a total of 18,965 ml of roads.