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Explore T2D Project

About the project
The tunnels
Open motorway linking the tunnels
Going underground
Environmental and economic benefits

About the project

people sitting on a blanket in a greenspace in Adelaide

The T2D Project design features two sets of twin tunnels – the Southern Tunnels and the Northern Tunnels. These tunnels will be connected by an open lowered motorway. The motorway and the tunnels will all have three lanes operating in each direction, with a combined total distance of 10.5km.

In the south, a tunnel for northbound traffic will run parallel to a tunnel for southbound traffic. The tunnel runs from Norrie Avenue in Clovelly Park to just south of the South Road tram overpass in Glandore.

In the north, two tunnels will run parallel to each other from near Sir Donald Bradman Drive in Hilton to Ashwin Parade in Torrensville. One tunnel will be for northbound traffic and one for southbound traffic.

The T2D Project will deliver a wide range of social, economic, environmental and safety benefits. This is in addition to reducing congestion, enabling quicker journeys, and improving safety.

Use this digital tool to learn more about key areas of the project.

The tunnels

Road emerging out of tunnel with light from above

The T2D Project design features two sets of twin tunnels – the Southern Tunnels and the Northern Tunnels.

The Southern Tunnels run between the open lowered motorway at Darlington to just south of Anzac Highway in Glandore. The Southern Tunnels provide key connectivity to Anzac Highway. This section includes about 4km of twin three-lane tunnels – one travelling northbound and one southbound.

The Northern Tunnels run between James Congdon Drive and the existing open motorway south of Grange Road. This section includes about 2.2km of twin three-lane tunnels – one travelling northbound and one southbound.

Open motorway linking the tunnels

person biking on side of the road in the evening with tunnel in the background

The open motorway connects to key routes such as Richmond Road and James Congdon Drive. It will provide critical east-west connectivity and links to key destinations such as Adelaide Airport.

This section of open lowered motorway is just over 2.5km in length.

Going underground

The T2D Project involves the construction of two separate sections of tunnels – the Southern Tunnels and the Northern Tunnels – connected by an open lowered motorway.

Each section will have one tunnel travelling northbound, and one tunnel travelling southbound. The motorway and tunnels will each have three lanes operating in both directions with a speed limit of 80km/h.

The entire project has a combined total distance of 10.5km. The Northern and Southern Tunnels will have a combined length of approximately 6.2km, making up more than 50% of the project.

Economic and environmental benefits

cars driving into tunnel beneath a green overpass

The T2D Project is expected to generate significant economic growth by:

creating jobs during and after construction
boosting local businesses
enhancing property values in surrounding areas.

Environmentally, the project aims to reduce carbon emissions by:

lowering traffic congestion
promoting the use of public transportation
contributing to a greener and more sustainable city.

About the project

The tunnels

Open motorway linking the tunnels

Going underground

Environmental and economic benefits