The T2D Project involves constructing two separate tunnels – the Southern Tunnels and the Northern Tunnels. The tunnels will be connected by an open motorway. The motorway and the tunnels will have three lanes operating in each direction, with a combined total distance of 10.5km.

Southern Tunnels
  • Run between the open motorway at Darlington to just south of Anzac Highway in Glandore and provide key connectivity to Anzac Highway
  • Includes about 4km of twin three-lane tunnels
Open motorway linking the tunnels
  • Connecting key routes such as Richmond Road and James Congdon Drive, it will provide critical east-west connectivity and links to key destinations such as the airport
  • Just over 2.5km in length
Northern Tunnels
  • Run between James Congdon Drive and the existing open motorway south of Grange Road
  • Includes about 2.2km of twin three-lane tunnels

When complete, more than 50% of the T2D Project will be tunnels.

  • Twin tunnels
  • 3 lanes in each direction
  • 80 km/h speed limit

Use the image gallery to see concepts of what the tunnel portals and open spaces in the project area might look like when complete.

  • An artist's impression of a daytime view looking south at the northern portal of the Northern Tunnels. Visible in the distance, the tunnel entrance is on a lowered motorway and framed by metal structures.
  • An artist's impression of a daytime view looking north at the southern portal of the Northern Tunnels. Visible in the distance, the tunnel entrance is on a lowered motorway and framed by concrete structures.
  • An artist's impression of a nighttime view looking north at the southern portal of the Northern Tunnels. Visible in the distance, the tunnel entrance is on a lowered motorway and framed by concrete structures.
  • An artist's impression of the maintenance and operations compound, viewed from South Road looking south at night. The image shows the new road alignment with landscaped areas.
  • An artist's impression viewed from the west side of the River Torrens. Taylors Bridge is over the river and visible in the distance.
  • An artist's impression of a reserve at Ashwin Parade near the Northern Tunnels' northern portal. This is the north-east facing view. People are taking walks or relaxing under on benches under trees amongst colourful bushes with flowers. Three children are playing soccer on flat ground. Shade structures are available in the distance.
  • An artist's impression of a reserve at Ashwin Parade near the Northern Tunnels' northern portal. This is the north-east facing view. People are taking walks or relaxing under on benches under trees amongst colourful bushes with flowers. Three children are playing soccer on flat ground. Shade structures are available in the distance.
  • An artist's impression of a reserve at Celtic Avenue. This is the north-west facing view. There are shared walking and bike paths with people walking and a cyclist amongst colourful bushes and flowers. There are many trees. In the distance, there is a playground.
  • An artist's impression of a reserve at York Avenue near the Southern Tunnels' southern portal. This is the north-east facing view. There is a basketball court and two rock-climbing structures. There are four adults playing basketball and many young children next to the rock-climbing structures. To the left, there is a cycling path with three cyclists. To the right, there are barbeque facilities under a shade structure. There are many trees and colourful bushes around the court.
  • An artist's impression of a reserve at South Road near the Southern Tunnels' southern portal. This is the south facing view. There is a shared walking and cycling path down the middle with a woman pushing a pram under the trees and a cyclist behind her at a distance. On the left, there is a playground with a swing. There is colourful landscaping everywhere. A basketball court can be seen in the far distance.

Motorway design

Watch the video to get an overview of the tunnels and motorway design.

Overview map

The map below provides an overview of the project layout.

Map of the River Torrens to Darlington (T2D) project in Adelaide, South Australia. The map shows the proposed route of the Northern and Southern Tunnels, with key locations marked including the Airport, Port, Old Noarlunga, Darlington, Anzac Highway, River Torrens, Adelaide CBD, and Gawler. The map includes a north-facing compass and scale.

Related pages

*Images displayed on this page are artist's impressions.