Highway 1 (South Australia)

Highway 1

South Australia
Highway 1; South Australia
	Map of South Australia with Highway 1 highlighted in red
General information
Type	Highway
Length	1,715 km (1,066 mi)
Opened	1955
Route number(s)	A1; (SA/VIC border to Mount Gambier); B1; (Mount Gambier to Tailem Bend); A1; (Tailem Bend to Murray Bridge); M1; (Murray Bridge to Glen Osmond); A1; (Glen Osmond to Dulwich); R1; (Dulwich to Medindie); A1; (Medindie to Eucla);
Major junctions
SA/VIC border end	near Mount Gambier
	Riddoch Highway; Dukes Highway; Portrush Road; Salisbury Highway; Northern Expressway; Stuart Highway; Lincoln Highway; Tod Highway; Flinders Highway;
SA/WA border end	near Eucla
Location(s)
Major settlements	Millicent, Kingston SE, Murray Bridge, Mount Barker, Adelaide, Port Wakefield, Port Augusta, Ceduna
Highway system
	Highways in Australia; National Highway • Freeways in Australia; Highways in South Australia;

In South Australia, Highway 1 is a 1,715-kilometre (1,066 mi) long route that follows the coastline of the state, from the Victorian border near Mount Gambier to the Western Australian border near Eucla. Highway 1 continues around the rest of Australia, joining all mainland state capitals, and connecting major centres in Tasmania. All roads within the Highway 1 system are allocated a road route numbered M1, A1, B1 or R1, depending on the state route numbering system. In South Australia, most of the highway is designated as route A1, with multi-lane, dual-carriage-way sections generally designated route M1, and the alignment around the Adelaide CBD designated route R1. South-east of Tailem Bend, it is designated route B1.