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)[1]
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
---- Infobox instructions guidelines examples talk

In South Australia, Highway 1 is a 1,715-kilometre (1,066 mi)^[1] 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.