The three highest priority sections of the North-South Corridor are the Northern Connector and upgrades to South Road at Darlington and from the Torrens Road to River Torrens.
The Torrens Road to River Torrens project involves the upgrade and widening of four kilometres of South Road, including a three kilometre lowered road and the grade separation of two major arterial roads (Port Road and Grange Road) and the Outer Harbor passenger rail line.
The Northern Connector project involves the construction of a new 15.5 kilometre road linking the Northern Expressway to the northern end of the South Road Superway.
The Darlington project involves reconfiguration of approximately 3.3 kilometres of South Road between the Southern Expressway and north of Tonsley Boulevard into an expressway-standard road. It includes underpasses below Flinders Drive and Sturt Road, Mimosa Terrace, Ayliffes Road and Tonsley Boulevard and a new connection with the Southern Expressway.
An upgraded North-South Corridor will improve freight transport productivity in Adelaide. The corridor is a critical route for the movement of freight and business-related passenger traffic, connecting the Port of Adelaide, Adelaide Airport, the Islington intermodal terminal and other freight terminals. Improvements to the corridor will contribute to enhanced productivity and increased competitiveness for export industries.
The projects are expected to improve safety by creating a free flowing link along one of Adelaide's most important transport corridors.
The Australian Government has committed $1.604.5 billion to these three critical projects. This is comprised of $496 million for the Darlington project (with a total project cost of $620 million), $400.5 million for the Torrens to Torrens project (with a total project cost of $801 million) and $708 million for the Northern Connector project (with a total project cost of $885 million).
Work on the Torrens to Torrens project began August 2015. Work on the Darlington and Northern Connector projects began in 2016. Work is expected to be completed in 2018 on the Darlington and Torrens to Torrens projects and in late 2019 for the Northern Connector project.