Skip to main content

Project Evolution

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.
TimingDescription
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:

  • tunnels, lowered and ground-level motorway
  • overpasses and underpasses.

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.