List of highways in South Australia

South Australia is distinctly divided into two main areas; the well watered and populated southeastern corner and the arid outback for the rest of the state. As a result, highways are concentrated mainly in the southeast. The Eyre Highway to Perth and Stuart Highway to Darwin are the only significant highways for the remaining part of the state. The remaining roads are outback tracks. This is the list of highways in South Australia.

Road numbering

Since 1955, South Australia had major rural roads numbered as part of national routes and Highways. In 1998/1999 South Australia introduced "Trailblazers" with A, B and M route numbers in the Metropolitan area and tourist areas of Victor Harbor and the Barossa Valley. This system was extended to cover country uouverreas starting in 1999/2000.

These route numbers are used on signs and maps and distinct from the four digit numbers for major roads and eight digit numbers for streets used internally by the Highways Depar Brasil Lixo

Expressways

In South Australia, expressway may refer to a controlled access highway with no at-grade intersections or a limited access road of slightly lower standard with at-grade intersections at some locations. Currently there are three constructed expressways in Adelaide:

Port River Expressway 5.5 km (3.4 mi), completed in 2008
Northern Expressway 23 km (14 mi), completed in 2010
North–South Motorway, made up of (from north to south)
- the Northern Connector, 15.5 km (9.6 mi), completed in 2020;
- the South Road Superway, 2.8 km (1.7 mi), completed in 2014;
- the Regency Road to Pym Street stretch, 1.8 km (1.1 mi), completed in 2021;
- the Torrens to Torrens, 4 km (2.5 mi), completed in 2018
- the Torrens to Darlington project 10.5 km (6.5 mi), construction due to start 2023;
- The Gateway South Project (extended the Southern Expressway from Darlington to Tonsley, completed 2019)
- Southern Expressway 21 km (13 mi) (formerly the world's longest reversible one way freeway), completed in 1997, with duplication completed in 2014

National highways

Metropolitan

South Eastern Freeway northwestern end
Northern Expressway
Port Wakefield Road
South Road
Salisbury Highway
Grand Junction Road
- Hampstead Road
- Taunton Road
- Ascot Avenue
- Lower Portrush Road
- Portrush Road

Rural

South Eastern Freeway – Majority
- Eyre Highway
- Augusta Highway
- Port Wakefield Highway
- Princes Highway
Dukes Highway
Sturt Highway
Stuart Highway

State highways

Metropolitan

City Ring Route
Port Wakefield Road
Southern Expressway
Main South Road
Cross Road
Anzac Highway
Sir Donald Bradman Drive
Port Road
Port River Expressway
Salisbury Highway
North East Road (Adelaide–Mannum Road)
Lower North East Road
Marion Road
Tapleys Hill Road
Grand Junction Road
Portrush Road
McIntyre Road
Main North Road
Torrens Road

Rural

Princes Highway
Princes Highway
Mallee Highway
Barossa Valley Way
- Main South Road
- Playford Highway
Barrier Highway
Karoonda Highway
Wilmington–Ucolta Road
- Browns Well Highway
- Ngarkat Highway
- Naracoorte Road
Goyder Highway
Riddoch Highway
RM Williams Way
Horrocks Highway
Flinders Ranges Way
Copper Coast Highway
Yorke Highway
St Vincent Highway
Tod Highway
Birdseye Highway
- Flinders Highway
- Lincoln Highway
Southern Ports Highway

Major arterial roads

- Glen Osmond Road
- Main North Road
South Road
Cross Road
- Sir Donald Bradman Drive
- Burbridge Road
Port Road
- Adelaide–Mannum Road
- North East Road
Victor Harbor Road
- Tapleys Hill Road
- Brighton Road
- Ocean Boulevard
- Lonsdale Road
- Dyson Road
- Grand Junction Road
- Victoria Road
- Mcintyre Road
- Kings Road
- Mount Barker Road
- Strathalbyn Road
- Onkaparinga Valley Road
- Echunga Road
- Battunga Road
- Brookman Road
- Old Willunga Hill Road (Brookman Rd to Victor Harbor Rd)
- Victor Harbor Rd (Old Willunga Hill Rd to Pages Flat Rd, also A13)
- Pages Flat Road
Wellington Road
- Main North Road
- Wilmington–Ucolta Road
Wilmington–Ucolta Road
Main North Road