Fast facts

Status

Open to traffic

Location

Intersection of Onkaparinga Valley Road, Nairne Road, and Junction Road, Balhannah

Funding

Jointly funded (80:20) by the Australian and South Australian governments

About the project

We have constructed a single-lane roundabout at the intersection of Onkaparinga Valley Road, Nairne Road, and Junction Road in Balhannah to increase safety and improve traffic flow. 

Improvements made at the intersection included:

• a new single-lane roundabout featuring a mountable kerb to facilitate heavy vehicle movements

• new pedestrian refuges and access ramps

• upgraded lighting

• new line marking

• new asphalt, kerb and guttering

What's happening

Major construction works on the new single‑lane roundabout at the intersection are now complete.

Some minor finishing works will be completed by end of May 2026 (weather permitting), with speed restrictions in place when required.

We would like to thank the community for their patience and understanding while we completed these important productivity and road safety upgrades.

Timeline

Concept design

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Project background

This project is part of the Adelaide Hills Productivity and Road Safety (AHPRS) Package.

The AHPRS includes a range of road improvements to support economic growth, improve road safety and increase fire resilience in the Adelaide Hills area.

Contact

Engagement Team

• DIT.Engagement@sa.gov.au
• 1300 794 880