River Torrens to Darlington (T2D) Project

The T2D Project is the final 10.5km section of the North-South Corridor, and 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 between the River Torrens and Darlington as they travel through two separate tunnels, connected by an open motorway.

Learn about how we’re building the T2D Project and view the latest construction activities.

About Project map Information sessions

Three easy ways to stay informed

The T2D Project is South Australia’s biggest-ever road project, and we are committed to keeping you informed. There are three easy ways for you to stay up-to-date on the project and construction activities.

Register for updates

Get the latest construction notifications delivered to your inbox or letterbox. We send regular E-updates about upcoming work to keep you up-to-date on the project and construction activities.

View surface works

See the latest surface construction works, including site works, tunnel portal construction and road closures.

View the tunnel tool

See the location and depth of the tunnels along the project corridor.

Information sessions

The T2D engagement team regularly visit locations along the alignment to discuss the project and answer any questions.

View events page

Latest news

Next chapter in delivering a non-stop South Road kicks into gear

11 July 2025

A second purpose-built precinct as part of the River Torrens to Darlington Project to deliver a non-stop South Road has been established ahead of construction of the Northern Tunnels.

Solid start for non-stop South Road

13 June 2025

Construction is underway on the massive concrete manufacturing facility that will supply more than 55,000 tunnel-lining segments for the River Torrens to Darlington Project that will create a non-stop South Road. The concrete slab that will form the base for the shed at the T2D precast concrete facility at Waterloo Corner is almost complete, while the first shed frames have also been raised. A total of 16 pours are required to form the base of the shed, which will be 285m long and 25m wide, at the facility wh

See all news and updates