 Both of the alternative routes proposed that the Zagreb–Karlovac motorway already completed in 1972 were to be used as the northernmost section of the Zagreb–Split and Zagreb–Rijeka motorways.The A1 was a showpiece project of the Croatian government and a symbol of uniting the country.The first attempt to revive the project in earnest occurred in the 1993, when the excavation of Sveti Rok Tunnel began.