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Adelaide Hills Intersections Upgrade Initiative

About the initiative

Princes Highway and Woodside Road intersection, Nairne

The State Government will improve road safety and traffic efficiency through the upgrade of the Woodside Road intersection with Princes Highway at Nairne.

The upgrade will seek to reduce delays for Woodside Road traffic, maintain a good level of intersection performance and cater for future growth. The upgrade will also aim to improve pedestrian and cyclist movements in the area and ensure safe access, particularly for Nairne Primary School students.

The intersection of Woodside Road and Princes Highway is located on the western outskirts of Nairne within a 50km/h speed zone. Since the completion of the Bald Hills Interchange project in 2016, traffic volumes at the Woodside Road and Princes Highway intersection have increased by approximately 10-15%.

Preliminary planning has identified treatments such as a roundabout or traffic signals as potential upgrade solutions. Further investigation will be undertaken to determine the preferred solution.

Onkaparinga Valley Road, Tiers Road and Nairne Road intersection, Woodside

The Australian Government has committed $2 million within its Roads of Strategic Importance program, over the 2019-20 to 2022-23 period, towards improving freight productivity and efficiency through the upgrade of the Onkaparinga Valley Road, Tiers Road and Nairne Road intersection.

The upgrade will seek to improve intersection safety and operation, balancing local community and industry requirements, and cater for future growth.

The intersection of Onkaparinga Valley Road, Tiers Road and Nairne Road forms a staggered-T arrangement and is located within a 50km/h speed zone in the Woodside township.  Onkaparinga Valley Road carries around 10,500 vehicles per day to the north of the intersection and 8,500 vehicles per day to the south of the intersection.  Nairne Road carries approximately 4000 vehicles per day.

What’s next?

A planning study tender for the Adelaide Hills Intersection Upgrade was released in September 2019. It is anticipated that the study will conclude early-mid 2020.

Stakeholder and community engagement forms an important part of the study.  You can read the community notification for the project, including details of two community consultation sessions in Nairne on Friday 8 November and Saturday 9 November, here.

We encourage you to have your say, using the contact details below. All feedback will be considered as part of the process to identify a solution that balances the needs of various stakeholders.

For more information

If you would like to have your say, enquire or register your interest in the project to receive updates, please: