Open invitation to tender, deadline 20/05/2020, for the operation of 6 semi-watertight doors for the 2770m Liautaud tunnel in Nice. Duration of the contract is 48 months. Contact Metropole Nice Cote d'Azur, Nice, tel +33 497132000, email dao@nicecotedazur.org. For tender information please click here and here. Ref.n. 20N0012. 13/20.