Southern Expressway, Adelaide

Southern Expressway South Australia
Coordinates	35°00′20″S 138°34′33″E / 35.005461°S 138.575802°E / -35.005461; 138.575802 (North end) 35°09′58″S 138°30′29″E / 35.166170°S 138.508034°E / -35.166170; 138.508034 (South end)
General information
Type	Freeway
Length	20.7 km (13 mi)[1]
Opened	17 December 1997 (completed on 9 September 2001, north carriageway in August 2014)
Route number(s)	M2 (1998–present)
Major junctions
North end	South Road St Marys, Adelaide
	Marion Road
South end	Main South Road Old Noarlunga, Adelaide
Location(s)
Region	Southern Adelaide[2]
Major suburbs / towns	Tonsley, Darlington, Trott Park, Reynella, Noarlunga Downs
Highway system
Highways in Australia National Highway • Freeways in Australia Highways in South Australia
---- Infobox instructions guidelines examples talk

Southern Expressway is an 18.5 km (11.5 mi) freeway^[3] through the southern suburbs of Adelaide, South Australia. It is the southern part of the North–South Corridor which extends the full length of Adelaide and is being built to urban freeway standard. It is designated part of route M2.

The Southern Expressway was built as a corridor to relieve heavy traffic from the major arterial, Main South Road, in Adelaide's south. It was originally built as a reversible one way freeway, and was the world's longest after its completion in 2001. Between 2010 and 2014, it was expanded and it is now a regular 2-direction freeway.

Construction of the expressway included the Adelaide Southern Veloway for cyclists, which runs alongside it for 7 km, from Marion/Main South Road to the Reynella Interchange. South of the Reynella Interchange, the bikeway becomes a shared track for the remaining 12 km of the expressway. The expressway crosses over the Coast to Vines Rail Trail at both Panalatinga Road and at the expressway's southern end.