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Gateway South (Darlington Upgrade Project)

This project by Gateway South has registered for a Design v1.2 IS Rating.


This is a $620 million project jointly funded by Australian and State governments ($496 million federally funded and $124 million state funded). The Darlington Upgrade Project is another important stage in the delivery of Adelaide’s North-South Corridor and will deliver an upgrade of approximately 3.3 kilometres of the existing Main South Road, including:

  • A non-stop motorway between the Southern Expressway and Tonsley Boulevard.
  • A lowered, non-stop motorway passing underneath Flinders Drive, Sturt Road, Sutton Road/Mimosa Terrace and Tonsley Boulevard.
  • Grade separation of the Main South Road/Ayliffes Road/Shepherds Hill Road intersection.
  • Main South Road (at grade) surface roads along both sides of the lowered motorway to provide connections to Flinders Drive, Sturt Road and most local roads.
  • Full free flow interchange at the Southern Expressway/Main South Road with dedicated ramps providing direct access to the new motorway and Main South Road.


  • Rating Type Road
  • Registered Date August 2016
  • Jurisdiction Australia
  • States SA
  • Suburb Adelaide
  • Assessor Laura Meredith
  • Annual Operating Cost $387 Million
  • Other Stakeholders Fulton Hogan, Laing O'Rourke, SMEC, DPTI Gateway South, KBR


For more information about this project, visit the infrastructure SA website.