River Torrens to Darlington (T2D) Project

The T2D Project is the final 10.5km section of the North-South Corridor. It will complete 78km of non-stop, traffic light-free motorway between Gawler and Old Noarlunga. Drivers will be able to bypass 21 sets of traffic lights as they travel through two separate tunnels connected by an open motorway.

A preferred Alliance partner has been selected to deliver this important project. The consortium includes John Holland, Bouygues Construction, Arcadis Australia, Jacobs and Ventia. These companies have an extensive track record of successfully delivering major tunnelling and infrastructure projects both in Australia and around the world.

The Australian and South Australian Governments are jointly delivering the T2D Project.

Project cost: $15.4 billion

Project timeline

Main construction works are proposed to start in 2025.

Tunnel boring machine works for the southern tunnels are planned to begin in the second half of 2026.

The entire T2D Project is expected to be open to traffic in 2031.

Other related works

There will be $850 million worth of additional network and amenity upgrades along and around the final 10.5km section. These upgrades to the broader network will make South Road safer, easier and more attractive to live and work. This supports economic uplift for local businesses.

The works include:

• a series of projects to upgrade the broader network
• rehabilitating and resurfacing South Road
• adding off-corridor shared-use paths to Improve connectivity for pedestrian and cyclists
• making amenity improvements. For example, road resurfacing, footpaths, vegetation, lighting and undergrounding of power lines
• upgrading haulage routes. This will prevent road degradation from vehicles delivering materials to and removing spoil from the site.

We are also rebuilding the existing tram overpass on South Road at Glandore to accommodate the T2D Project's lowered motorway. This upgrade is part of the Tram Grade Separation Projects.

Learn more

More information