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South Australian Rural Highway Corridor Upgrades


In 2020, The Australian and South Australian Governments have committed $1.1 billion to upgrade South Australia’s rural highway corridor. This represents the largest ever rural road investment for South Australia and includes upgrades to the Princes Highway Corridor, Horrocks Highway, Sturt Highway, Barrier Highway, Eyre Highway and Eyre Peninsula Roads.

Combined, these corridors make up approximately 2,400km, or just under 20 per cent, of South Australia’s 12,600km sealed regional road network.

This unprecedented investment aims to:

  • Provide a more reliable and safe road network
  • Improve access for high productivity freight vehicles
  • Better connect rural communities
  • Facilitate economic growth
  • Enhance tourism opportunities in rural South Australia.

Funded projects include:

Roads of Strategic Importance (ROSI)

The $275 million Roads of Strategic Importance program (ROSI) within SA is an initiative of the Australian Government which aims to deliver improvements to freight movements, support regional economic growth and connectivity, and improved safety for all road users. Proposed rural road corridor upgrades to Sturt Highway, Barrier Highway and Eyre Highway fall under this program. Find out more

Princes Highway Corridor

The $250 million Princes Highway Corridor program covers proposed works from the SA/Victoria border (near Mt Gambier) through Millicent, Coorong, Tailem Bend to Mount Barker, then along the Port Wakefield and Augusta Highway from Virginia to Port Augusta. Find out more.

Horrocks Highway Corridor Upgrade

The $55 million Horrocks Highway Corridor Upgrade forms part of the SA Rural Road Package funding and is focused on upgrading the 245km length of highway between Wilmington and Gawler. Find out more.

Next Steps

A staged project approach to these investments has been adopted to maximise the potential for input from all levels of government, industry and the local community.

The Department for Infrastructure and Transport has progressed with a corridor analysis to identify infrastructure deficiencies and opportunities for road improvements.

This analysis has informed the development of a proposed program of works to fit within the available funding, in consultation with local government, industry and key stakeholders.

Initial consultation to inform local government leaders and key industry stakeholders is nearing completion and feedback has been used to test the validity of the proposed works program, while also identifying ‘reserve’ projects.

Survey and investigative works have commenced along the identified highways to inform the planning process.

Planning and design work will continue in the coming months with more information on the proposed scope of works expected in 2021.

The Department will continue to consult with regional councils, key industry stakeholders and the local community throughout the project planning and design phase.

Some of the pavement upgrade works associated with this program have been “fast-tracked” into delivery as a Government COVID-19 economic stimulus measure.

Contact Us

If you have any further questions about the South Australian Rural Highway Corridor Upgrade investment please don’t hesitate to contact the team: