The Western Highway is the Victorian part of the principal route linking the Australian cities of Melbourne and Adelaide with a length of approximately 314 kilometres (195 mi) of single carriageway then 156 kilometres (97 mi) of dual carriageway known as the Western Freeway. It is a part of the National Highway network and designated as National Highway A8 and M8. The western end continues in South Australia as the Dukes Highway, the next section of the Melbourne–Adelaide National Highway. The Western Freeway joins Melbourne's freeway network via the Western Ring Road, in the middle western suburbs of Melbourne.