High Quality Content by WIKIPEDIA articles The Southern Expressway is the world's longest reversible one way freeway. Originally proposed as 'Noarlunga Freeway', it was built as a corridor to relieve heavy traffic from the major arterial, Main South Road, in Adelaide's south. The expressway was built in two stages - the first completed in late 1997, the second in 2001. The total cost of the arterial was A$76.5m, and it is 21 km in total length. There...