Port River Expressway is a 5.7-kilometre (3.5 mi) freeway-grade road. The expressway links Port Adelaide and the LeFevre Peninsula across the north-western suburbs of Adelaide to major interstate routes via North-South Motorway. The expressway is only grade-separated at the North-South Motorway, Hanson Road and Eastern Parade interchanges; the following two intersections are at grade with traffic signals installed. This has led to the route being labelled as the A9, instead of the more common M label associated with freeways and expressways in South Australia.