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Onkaparinga Valley Road, Nairne Road and Junction Road Intersection Upgrade

Consultation Open

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We are undertaking site investigation works, including geotechnical drilling and surveys, at the Onkaparinga Valley Road, Nairne Road and Junction Road intersection from 24 June 2024 to 28 June 2024, weather permitting.

See the latest work notification 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.

We would now like to hear from you to gather local insights to inform the detailed design of the roundabout.

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

Have your say

We would like to seek your feedback on the proposed upgrade. Your feedback will help inform the detailed design. You can provide your feedback by taking a short survey.

You can also provide your feedback in person, or discuss the project further with our team at:

  • Balhannah Soldiers Memorial Hall (91 Onkaparinga Valley Road) on Thursday 20 June 2024 between 5pm and 7pm
  • Balhannah Soldiers Memorial Hall (91 Onkaparinga Valley Road) on Saturday 22 June 2024 between 10am and 12pm

Further information

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