Key Facts
Southern Gateway Alliance (SGA) was formed in September 2006 to design, construct and deliver the New Perth Bunbury Highway project, which is one of Western Australia’s most significant infrastructure projects.
To meet this challenge, three of the industry’s leading companies - Leighton Contractors, WA Limestone and GHD have come together with Main Roads Western Australia (Main Roads), our State road agency.
This same team has recently been selected by Main Roads as the preferred builder to design and construct the new Mandurah Entrance Road.
Follow the link to the Information Sheets and Key facts.