OPERATIONAL AND MAINTENANCE FEATURES OF THE SV. TRI KRALJA TUNNEL ZNAČAJKE UPRAVLJANJA I ODRŽAVANJA TUNELA SV. TRI KRALJA

The paper focuses on the features of the operation and maintenance of tunnels on the Zagreb-Macelj motorway. When it comes to the operation and maintenance of a series of six tunnels on the Zagreb-Macelj motorway, Sv. Tri Kralja Tunnel is the most challenging structure on the motorway, where it is necessary to provide an adequate level of safety and operability. Tunnel operation is ensured by the concession model of public - private partnership, which is applied to the Zagreb – Macelj motorway. Features of the tunnel infrastructure maintenance are emphasized, as well as importance of the extraordinary maintenance of the tunnel infrastructure. The goal of the tunnel operation and maintenance is to ensure undisturbed and safe traffic flow through the tunnels, by keeping the tunnel in normal functional conditions.