Major construction at road surface will start in the south from January 2025. Early works will also continue along the broader alignment ahead of major construction starting later in the year.
The first tunnel boring machine (TBM) is scheduled to arrive in late 2025. With three TBMs now planned for the project, we can construct both southern and northern tunnels at the same time. We can reasonably expect to not only complete the project by the 2031 deadline, but even earlier.
Activities are ramping up in early 2025 as we establish three key surface-level construction precincts along the alignment: southern, central and northern.
Construction activities started in the southern precinct in January 2025.
Construction will begin in the central and northern precincts later in the year.
Dates indicative - may be subject to change
We have completed extensive work to identify a preferred alignment and configuration for this section of the North-South Corridor. This work has long supported a need for a motorway solution to ease congestion on South Road.
Options explored for the T2D alignment and configuration included:
an open motorway
an elevated motorway
an 'offline' option using major arterial roads
cut-and-cover tunnelling construction technology
a dual corridor (using South Road and Marion Road)
a single long tunnel.
| Timing | Milestone |
|---|---|
| August 2024 | Selected the preferred alliance partner to deliver South Australia’s biggest-ever infrastructure project. The consortium comprises John Holland, Bouygues Construction, Arcadis Australia, Jacobs and Ventia. |
| March 2024 | Released the Project Assessment Report (PAR) for community consultation across a five-week period. |
| November 2023 | Released the Urban Design Strategy for community consultation. |
| January 2023 | Commenced procurement via a Registration of Interest process for stages 1 and 2 of the project. The scope of works comprises the delivery of a 10.5km motorway. It will be delivered via an Alliance contract. |
| December 2022 |
Further refined the project design as part of the Government of South Australia's Project Review. Released the project design for public consultation. |
| November 2021 | Released the T2D Reference Design. |
| November 2020 | Commenced the reference design phase. |
| November 2020 |
Announced that the preferred design will use a combination of:
This protects cultural sites and opens up suburbs to new recreational spaces. It also and minimises the extent of property acquisition as much as possible. Trucks, transport and interstate traffic will use the final 10.5km section of the North-South Corridor. This will bring citywide benefits, both now and in the future, for commerce and commuters. |