 This route will eventually continue as a modern motorway towards Sarajevo and further on to the Croatian sea port of Ploče.The A4 connection from Zagreb to Varaždin and Čakovec exists since 2003, which was extended to the Hungarian border in 2008 to complete the upgrade of the European route E71.The A6 route between Rijeka and Zagreb was constructed as an expressway in spring 2004, and upgraded to a full motorway in 2008, thus upgrading the Croatian section of the European route E65.