The WestConnex M4-M8 Link Tunnels project delivered new twin tunnels which link the existing M4 motorway at Haberfield to the M8 motorway at St Peters. The $3.2 billion project involved the construction of 7.5 kilometres of tunnel at an average depth of 35 metres. By connecting M4 and M8, the link tunnel is expected to remove 4,000 trucks from Parramatta Road per day and up to 100,000 vehicles per day from surface road networks, and allows for the circumvention of 52 sets of traffic lights from Parramatta to Mascot.
The Judging Panel commends the complex integration of the new underground link into an existing network of roads, noting that it is Australia’s first integration of two live motorways. The Panel recognised the strong and productive relationship between all stakeholders, ensuring the project was an operational success, which was underscored by the positive community response to the project.