The final design for Stage Two of the Main South Road duplication has been released, with major construction work about to kick off.

Works on the newly-duplicated Main South Road between Seaford and Port Road, Aldinga, are close to completion.

This next stage will see the duplication of Main South Road continued from Aldinga Beach Road to Sellicks Beach.

The project includes realignment of the Aldinga Beach Road and Sellicks Beach Road intersection; an underpass at the intersection of Main South Road with the newly realigned Aldinga Road and Aldinga Beach Road; and three U-turns to facilitate local access, in addition to the Aldinga interchange.

It also includes intersection upgrades at Hart and Colville Roads, Norman and Rogers Roads, and Hahn and Cox Roads, plus installation of wide centre medians and wire rope barriers to improve safety by separating northbound and southbound traffic.

A shared use path will be built along the western side of Main South Road, from Aldinga to Sellicks Beach.

The project is expected to be completed in 2026.

An animation of the planned Stage Two duplication can be viewed online.

Infrastructure and Transport Minister Tom Koutsantonis says  all four lanes of Stage One of the Main South Road duplication have opened to traffic.

“Around 17,000 vehicles travel on Main South Road every day. 

“Continuing the duplication will improve safety and travel times for motorists, while also improving road and network connectivity to support regional growth and tourism across the Fleurieu Peninsula.

“Following feedback from those who live, work and travel in the region, we’ve updated the design of Stage Two to ensure it delivers the best outcome for all road users.

“We’ve added in an additional U-turn, improved pedestrian access at Sellicks Beach and modified the Aldinga interchange to improve connectivity.”