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Main South Road Upgrade - Old Coach Road To Malpas Road

About the project

The upgrade of Main South Road, between Old Coach Road to Malpas Road, is a safety driven project which aims to reduce the number and severity of serious and minor injury crashes. The upgrade will also support future increase in road users and improve traffic flow.

Main South Road, between Old Coach Road and Malpas Road has annual average daily traffic of approximately 17,900 vehicles per day with 78 per cent of crashes occurring at intersections.

The project will deliver the following safety improvements: 

  • A new single lane roundabout at the junction of Port Road and Main South Road with a dedicated left slip lane for northbound vehicles from Port Road. Flour Mill Road will remain closed.
  • U-turn facility north of Malpas Road.
  • A two metre wide centre traffic median between Port Road and Malpas Road with central wire rope safety barrier.
  • Extension of the Main South Road left turning lane into Malpas Road.
  • Road widening and resurfacing, improved road lighting, road signage and line marking.
  • Removing right turn movements in and out of Little Road at Main South Road.
  • A shared user path crossing at Main South Road to facilitate cycling and walking between Aldinga and Willunga.
  • Pedestrian and cyclist access improvements at the roundabout.
  • Reinstating left turn movements out of Old Coach Road at Main South Road.
  • A reduction of the speed limit from 100 km/h to 90 km/h between Seaford Heights and Little Road; from 80 km/h to 70 km/h between Little Road and Hart Road; and from 100 km/h to 90 km/h between Hart Road and Sellicks Hill which is further south of this project.

A reduction of the speed limit from 100 km/h to 90 km/h between Seaford Heights and Little Road; from 80 km/h to 70 km/h between Little Road and Hart Road; and from 100 km/h to 90 km/h between Hart Road and Sellicks Hill, which is further south of this project, has been completed.

View Final Plan here for further information

Why is this happening and what will it cost?

In mid-2013, the Department of Planning, Transport and Infrastructure released a Draft Road Management Plan (RMP) for Main South Road. Following extensive consultation with stakeholders and the community, the completed RMP identifies a number of opportunities to improve road safety.

As an outcome of the investigations to reduce fatalities and serious injuries on Main South Road, the Motor Accident Commission has allocated $11.2 million to improve safety for road users between Old Coach Road and Malpas Road, Aldinga.

To view a copy Download the RMP here.

What is the timeframe for installation?

Service relocation works commenced in October 2016 and are substantially complete. The project is expected to be completed in April 2018, weather permitting.

What is the latest news?

  • The main construction contract has been awarded to local South Australian company York Civil Pty Ltd.
  • To avoid significant wet weather impacts on construction and extended delays to the community and road users, major construction works are planned to commence in more favourable weather conditions around September 2017.

Want more information?

If you have any enquiries about this project please email the project team at dpti.communityrelations@sa.gov.au or telephone Community Relations on 1300 794 880.

The City of Onkaparinga is simultaneously undertaking a number of its own infrastructure projects throughout 2017 that are unrelated to this project. For more information on these projects please visit: www.onkaparingacity.com.au/aldingatownship