Highway 1 (South Australia)

Highway 1 South Australia
Map of South Australia with Highway 1 highlighted in red
General information
Type	Highway
Length	1,717 km (1,067 mi)
Opened	1955
Route number(s)	B1 (south of Murray Bridge) National Highway M1 (Murray Bridge to Glen Osmond) A1 (Glen Osmond to Waterloo Corner) National Highway A1 (Waterloo Corner 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 1,717-kilometre (1,067 mi) long^[1] 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 1, M1, A1, or B1, depending on the state route numbering system, and parts are concurrent with National Highway routes. In South Australia, most of the highway is designated as route A1, with multi-lane, dual-carriage-way sections generally designated route M1. South-east of Tailem Bend, it is designated route B1.

Overhead sign showing Port Wakefield Road as State Route A1, in Mawson Lakes

History

Highway 1 was created as part of the National Route Numbering system, adopted in 1955. The route was compiled from an existing network of state and local roads and tracks.^[2]

Route description

In South Australia, the highway connects:

• Mount Gambier
  • via Princes Highway to
• Murray Bridge
  • via South Eastern Freeway to
• Glen Osmond
  • via Glen Osmond Road to
• Adelaide city centre
  • via Main North Road to
• Gepps Cross
  • via Port Wakefield Road to
• Port Wakefield
  • via Augusta Highway to
• Port Augusta
  • via Eyre Highway to
• Eucla

Major intersections

• Riddoch Highway (A66)
• Dukes Highway (National Highway A8)
• Portrush Road (National Highway A17)
• Salisbury Highway (National Highway A13 / A13)
• Northern Expressway (National Highway M20)
• Stuart Highway (National Highway A87)
• Lincoln Highway (B100)
• Tod Highway (B90)
• Flinders Highway (B100)

References

Route map:

See also

• Highway 1 (New South Wales)
• Highway 1 (Northern Territory)
• Highway 1 (Queensland)
• Highway 1 (Tasmania)
• Highway 1 (Victoria)
• Highway 1 (Western Australia)