Frequently Asked Questions

The Australian and South Australian governments have committed $150 million (80:20) to upgrade the Mount Barker and Verdun interchanges.

The project aims to improve connectivity to the South Eastern Freeway and improve the capacity of the interchanges in response to existing and projected growth for Mount Barker and the Adelaide Hills area.

The project is expected to support approximately 260 full-time equivalent jobs per year over the construction period.

The existing Verdun Interchange will be upgraded to a full interchange, allowing access to and from the South Eastern Freeway in all directions. Upgrading this interchange will improve connectivity, traffic efficiency and commuter safety in the area.

Key features include:

• a new eastbound entry ramp (towards Mount Barker);
• a new westbound exit ramp;
• a new single lane roundabout at the Mount Barker Road/Silver Road junction;
• existing Bus Stop 48A on both sides of Mount Barker Road to be consolidated with Bus Stop 49; and
• minor realignment of the freeway to accommodate the new exit ramp.

Major construction at the Verdun Interchange is planned to start in late 2025. The interchange is expected to be open to traffic in late 2027.

We expect the roads will remain open for most of the construction period with speed and lane restrictions in place, however, it’s likely there will be some temporary closures to tie into existing road infrastructure.

We will continue working on minimising any impacts to road users and the community wherever possible and will provide more information on traffic impacts as it becomes available.

We encourage you to subscribe for updates to receive the latest information about the project.

The concept design indicates that there will be some impact to existing vegetation and trees located at the intersection. As the design progresses, further details will be made available regarding any vegetation impacts.

Fauna considerations form part of the Department for Infrastructure and Transport’s standard Environment and Heritage Impact Assessment processes. Ecological assessment will be undertaken to identify fauna habitat and ecological communities to assist the design.

We understand the ecological importance of roadside vegetation and will continue to minimise potential impacts to vegetation and fauna in the next stage of design.