Artist’s rendering of the Torrens Road to River Torrens (T2T) upgrade project.

The Torrens Road to River Torrens (T2T) upgrade project involves the construction of a 3.7km-long road running north to south between Torrens Road and River Torrens, South Australia. The project is being implemented as part of the larger North South Corridor Project, which is a 78km transport corridor extending between Gawler and Old Noarlunga.

Being implemented by both South Australian and Australian Federal Governments, the road upgrade will significantly improve travel times.

Upon completion of the upgrade by the end of 2018, the section of the North-South Corridor will be able to serve up to 115,000 vehicles a day, more than double compared with the existing capacity of 52,000 vehicles a day. The project will significantly reduce congestion and delays on the corridor. It is also expected to create 480 jobs during the construction phase.

T2T road upgrade project details

The Torrens Road to River Torrens road upgrade involves the addition of a 3km non-stop road section between Torrens Road, Renown Park, and Ashwin Parade, Torrensville. It also includes a 2km stretch of lowered, non-stop motorway from Dartmouth Street, Croydon to Gawler Avenue, West Hindmarsh, which will contain three lanes in each direction.

Parallel surface roads will be built along the length of the lowered motorway that connects most local roads and arterial roads to South Road. A rail overpass will be built for the Outer Harbor railway line between South Road and Coglin Street. Six intersections will be upgraded that include those at Torrens Road, Hawker Street, Hurtle Street, Port Road, Grange Road/Manton Street and Ashwin Parade/West Thebarton Road. The cycling and pedestrian facilities will also be improved as part of the project.



Australia’s New South Wales (NSW) Government, Transurban and M7 Westlink are constructing a 9km-long tolled motorway known as NorthConnex in Sydney.


The concept design for the project adapted a range of treatment measures to reduce construction and operational noise, such as a selection of asphalt types, lowering the road, and installation of acoustic barriers on the side of the rail overpass.

Construction

The construction on the T2T road upgrades began in late 2014 with early works on the site. Major construction on the project began in August 2015.

The construction activity complies with the requirements and guidelines of the South Australian Department of Planning, Transport and Infrastructure (DPTI) and the Environmental Protection Authority (EPA).

A pedestrian and cyclist bridge over the River Torrens in the surrounding of McDonnell Avenue will be constructed to connect the River Torrens with the Outer Harbour Greenway.

Contractors involved

T2T Alliance consortium, comprising York Civil, Leighton Contractors and Aurecon, was contracted to upgrade the South Road between Torrens Road and the River Torrens in May 2015.

Wallbridge & Gilbert was awarded a contract to provide engineering design services in association with Aurecon and MacDonald. The contractual scope also includes providing support in the areas of structures, retaining walls, drainage and services.

Financing

The T2T project is estimated to cost A$896m ($657m), which will be jointly funded by the federal and South Australian Governments, both committing A$448m ($342.89m) each.