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Princes Highway Upgrades

The Australian and South Australian government have jointly committed $190 million (80:20) to the Princes Highway Corridor Upgrade program.

These works will support South Australia's regional  economic growth, improve access for high productivity freight movements, provide upgrades to regional road networks for improved accessibility and community connectivity, enhance opportunities  for regional  tourism in South Australia and improve long term safety and efficiency for all road users.

Sections to be upgraded

Extending approximately 430km, this section of Princes Highway passes through the townships of Mount Gambier, Millicent, Kingston Southeast, Meningie, and Tailem Bend to Mount Barker.

This includes proposed works from the South Australia/Victoria border (near Mount Gambier) through Millicent, Coorong, Tailem Bend to Mount Barker.

Upgrade works between Meningie and the South Australian border are currently in the design phase with construction scheduled to commence mid 2022 with completion expected in late 2023, weather permitting. This will include:

  • new overtaking lanes and overtaking lane extensions;
  • road safety improvements including barrier upgrades, lighting upgrades, wide centreline treatments; with audio tactile line marking (ATLM);
  • shoulder sealing;
  • junction upgrades;
  • new and upgrade of rest areas; and
  • pavement reseal and rehabilitation.

Community Engagement

Community and industry engagement will form an important component across the life of the project. We look forward to connecting with you in the coming months about these exciting projects.

For further information please contact our team on 1300 794 880 or email

We encourage the community to register for email updates.

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COVID-19 Response

The Department will continue to tailor community engagement opportunities in line with the latest COVID-19 advice from health authorities.

Face-to-face engagement opportunities may be restricted and we will continue to be guided by the advice of health authorities, with the health and safety of our stakeholders always our highest priority.