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Onkaparinga Valley Road, Nairne Road and Junction Road Intersection Upgrade

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In June 2024, we shared a project update with you which included the proposed concept design for the intersection upgrade and sought your insights and feedback to help inform the detailed design.
Approximately 60 people joined our project team at two information sessions in Balhannah, to share further insights and provide feedback on the proposed design. We also received 56 online survey responses during consultation.

Almost 70% of survey respondents expressed support for the proposed design, believing it would enhance safety for all users. View the consultation summary report for more information.

Project Background

We are delivering the Adelaide Hills Productivity and Road Safety (PRS) Package to upgrade key strategic arterial roads in the region. The road improvements will support economic growth, improve road safety and increase fire resilience. The $150 million initiative is jointly funded by the Australian Government (80%) and South Australian Government (20%) over five years.

Onkaparinga Valley Road has been identified as a key arterial road in the Adelaide Hills that would benefit from safety upgrades. Since May 2023, key activities to improve road safety have included increasing skid resistance, improving and widening sealed shoulders, as well as widening side roads.

As part of this road upgrade, a single-lane roundabout at the Onkaparinga Valley Road, Nairne Road, and Junction Road intersection has been identified as the best outcome for improving safety at this location.

View the proposed design

The construction of a roundabout at the intersection of Onkaparinga Valley Road, Nairne Road, and Junction Road intersection was selected as the preferred treatment, as it best achieves:

  • increased safety for all users throughout the intersection
  • improved traffic movements throughout the intersection
  • new and upgraded pedestrian crossing facilities
  • improved footpaths for better access around the interaction

Further information

For further information, or to subscribe for future project updates, please: