River Torrens to Darlington (T2D) Tunnel Project
Sector: Tunnel • Location: Adelaide, South Australia, Australia
Source: Autonocion.com
The River Torrens to Darlington (T2D) project is the largest infrastructure project South Australia has ever attempted, involving the construction of 6.5 miles of road tunnels under Adelaide. It uses three large-scale tunnel boring machines (TBMs) named Mary, Catherine, and Elizabeth to dig twin Southern Tunnels and Northern Tunnels concurrently. The project aims to complete a non-stop motorway th
- Status
- Under Construction
- Sector
- Tunnel, Road, Government
- Location
- Adelaide, South Australia, Australia
- Updated
- 22 Jul 2026
- Source
- Autonocion.com
ConstructChat
Ask ConstructChat about River Torrens to Darlington (T2D) Tunnel Project
Pick a question to edit it, or write your own.
First answer free · no account
Project Information FAQ
Project Information
Participants
| Not available for this record. |
Status
Original status | under construction |
Taiyo status | Under Construction |
Taiyo last update | 2026-07-22 |
Contact
| Not available for this record. |
Description
Description | The River Torrens to Darlington (T2D) project is the largest infrastructure project South Australia has ever attempted, involving the construction of 6.5 miles of road tunnels under Adelaide. It uses three large-scale tunnel boring machines (TBMs) named Mary, Catherine, and Elizabeth to dig twin Southern Tunnels and Northern Tunnels concurrently. The project aims to complete a non-stop motorway through Adelaide, removing 21 sets of traffic lights and reducing peak hour travel time by up to 40 minutes. The project cost is A$15.4 billion (approximately $10.7 billion USD), funded equally by the state and federal governments. The tunneling is expected to take up to 24 months, with the road opening planned for 2031. |
Original sector | Transportation |
Budget |
Location
Country | Australia |
State | South Australia |
City | Adelaide |
Source
Source | Autonocion.com |
URL |
More Details
Record type | Project |
Sector | Tunnel, Road, Government |
Article published date | 2026-07-14 |
Research
Free account
View all details
You are reading the public part. A free account opens the rest:
- Every detail on this project
- News and media coverage
- Technical research
Free account · no card · lands you back on this project