From 7am on Saturday 7 February, the Main South Road Duplication project (Stage 2) will open to traffic in its final configuration, marking the completion of major works on the project.

The State Government and the Fleurieu Connections Alliance would like to thank you for your support and advocacy for this project from the very beginning.

The new Aldinga underpass will open, restoring uninterrupted north-south travel through the region. Two lanes of traffic will operate in each direction, improving safety and traffic flow at peak times.

Reduced speed limits will remain in place to allow newly laid surfaces to stabilise and meet safety and performance requirements. Speed limits will be reviewed regularly in accordance with relevant standards and guidelines, with updates provided as changes occur.

All upgraded intersections will open in their final configuration, delivering clearer traffic movements, improved sight lines, and safer commutes for all road users.

Short-term road closures will be required from 7pm Friday 6 February to support the final traffic switch ahead of the full opening.

These closures are essential to safely remove temporary traffic controls, activate the final road layout, and complete line marking and safety checks before the road opens to traffic.

Temporary closures and changed traffic conditions will be in place at various locations along Main South Road and connecting roads. Traffic controllers and signage will be onsite to guide road users. Access for local residents and emergency services will be maintained where possible.

These works are short in duration and planned to minimise disruption while ensuring a safe and smooth transition to the final road layout.

Thank you for your patience as we complete this final step and prepare to open Main South Road in its final form.

While Main South Road will open in its final configuration, some finishing works will continue over the coming months. The main carriageways, pavement, and major structures are complete.

Remaining activities will focus on final detailing and presentation. These works include landscaping, site remediation, inspections, minor adjustments, and maintenance activities to ensure the corridor performs as designed and meets long-term standards.

Works will take place Monday to Friday between 7am and 7pm. Some night works and short term closures will be required at times to complete specific tasks safely and efficiently. Short-term impacts such as noise, lighting, or temporary traffic management will be managed to minimise any impacts. We’ll provide updates via SMS and our website where changed traffic conditions are required

You can stay up to date on upcoming works and potential impacts by registering for SMS updates. Register at www.fcalliance.com.au/SMS

The new Aldinga interchange provides dedicated pedestrian and shared use paths in all directions, including north south access via the signalised pedestrian crossing on Aldinga Beach Road. These will connect to existing local paths toward Seaford (constructed as part of Stage 1), and the council footpath near How Road. This complements to the shared use path now open between Aldinga and Sellicks Beach, further enhancing safe and continuous walking and cycling connectivity through the area.

The shared use path forms a key part of the project and delivers lasting community benefits for. Soon it will connect with the Stage 1 path to create a continuous, dedicated pedestrian and cyclist link from Seaford to Sellicks Beach. The path supports safer travel, recreation, and active transport for people of all ages, improving connectivity between communities along the corridor.

Pedestrians are asked to use the signed pedestrian paths and crossings and follow signage when moving through the area.

Over 99% of the workforce engaged on the project came from South Australia. Over two million work hours were delivered by local people across planning, construction, traffic management, environmental services, and support roles. Skills stayed local. Jobs stayed local. Experience grew locally.

Almost 95% of project contracts were awarded to South Australian businesses. Local contractors, suppliers, and specialists played a direct role in delivering every part of the corridor. From civil works and structures to landscaping, safety systems, and finishing works, local businesses helped shape a road built for their own communities.

We are proud to have strengthened the regional economy, supported apprenticeships and trainees, and built long-term capability across the state. The result extends beyond the road itself. The project leaves a skilled workforce, stronger local businesses, and lasting value for South Australia.

This project was delivered by people who live here, work here, and use it every day.

Stage 2 of the Main South Road Duplication Project commenced in March 2024, building on the completion of Stage 1 and years of planning before works began. We acknowledge that large infrastructure projects bring disruption and change, and we recognise the impact this can have on daily life.

Thank you for your patience, understanding, and willingness to work with us throughout delivery. Your feedback, questions, and conversations helped shape how works were planned, communicated, and delivered. Ongoing engagement with residents, businesses, and road users played a direct role in improving outcomes along the corridor.

This project reflects a shared effort. Community input strengthened decisions. Local knowledge informed solutions. The result is infrastructure that better serves the people who use it every day.

For more information, or to contact a member of the project team, please: