Main South Road Duplication

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The state government has allocated $305 million to Stage 1 of the Main South Road duplication project, from Seaford to Aldinga, improving transport links along one of the main site boundaries.

State Gov project: Stage 1 TBC

Detailed designs are currently being developed, with Stage 1 still waiting to commence. The duplication of Main South Road between Seaford and Sellicks Beach aims to improve road safety, as well as improve traffic flow and increase capacity.

Main South Road has an average traffic of 17,000 vehicles per day, and the duplication will make travelling to, from and within Adelaide’s south safer and easier.

The duplication will be delivered in two stages:

  • Stage 1 will involve the duplication of approximately 10 kilometres of Main South Road from south of Griffiths Drive in Seaford to Aldinga. This will include the duplication of the Pedler Creek Bridge at Seaford Rise. This stretch of Main South Road was identified as a priority in the State Government’s Integrated Transport and Land Use Plan. The state Government will invest $305 million for stage 1 of the duplication, supporting 165 jobs a year during construction.
  • Stage 2 will continue duplication of Main South Road for approximately 6 kilometres from Aldinga to Sellicks Beach. A previously-announced project to improve safety between Old Coach Road and Malpas Road will still go ahead as planned. The duplication of Main South Road in this section will integrate with these works.

Seeking suitably qualified and experienced road design and construction experts:

Contact the project team on 1300 794 880 or at the email below.

Refer to DPTI link:

Contact Project Leader

Nomination to become a council supplier

Further to the ON Business Directory, the City of Onkaparinga uses a system for registration of suppliers called VendorPanel, which is free for invited suppliers to access. The system allows council staff to easily identify and request quotes from suitable suppliers, and provides a simple mechanism for suppliers to respond. The form below will be submitted to our Procurement Team who will work with you through the process of becoming a pre-qualified supplier.