List of highways in South Australia

South Australia

General highways map of South Australia

Highways of south eastern 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 Harbour and the Barossa Valley.^[1]^[2] This system was extended to cover country areas starting in 1999/2000.^[3]

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 Department and later Departments of Transport to identify each road.

Expressways

File:Port expressway, south road.jpg

South Australian expressway
A9 Port River Expressway

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:

Southern Expressway 21 km (13 mi) (the world's longest reversible one way freeway), completed in 1997, with duplication completed in 2014
Port River Expressway 5.5 km (3.4 mi), completed in 2008
Northern Expressway 23 km (14 mi), completed in 2010