Roadheaders break through WestConnex at M8 Motorway

Roadheaders break through at the St Peters Interchange. Image courtesy of Transport for NSW.

The M4-M5 Link Tunnels are now connected to the M8 Motorway for the first time, linking the two stages of the major WestConnex project.

Roadheaders have been creating the missing link in Sydney’s motorway network, which will eventually provide tunnels between the M4, M8 and M5 motorways.

Federal Minister for Communications, Urban Infrastructure, Cities and the Arts, Paul Fletcher said the major milestone was reached 41 metres underground at the St Peters Interchange.

“The Commonwealth and NSW have worked closely together on WestConnex and our joint financial commitments are delivering major benefits to Sydney motorists in reduced travel times, less congestion, and greater safety,” Fletcher said.

New South Wales Minister for Transport and Roads Andrew Constance said this breakthrough is the first of six planned on the $3.2 billion project this year.

“The M4-M5 Link Tunnels are the missing link in Sydney’s motorway network. Once connected the twin 7.5 kilometre tunnels will create an underground western bypass of the CBD,” Constance said.

He said the tunnels will also provide connections to future motorway projects including Sydney Gateway, M6 Stage 1 and the Western Harbour Tunnel and Beaches Link through the Rozelle Interchange.

“Significant progress has been made underground with 17 kilometres excavated and tunnelling on track to be completed this year. These tunnels are so important because they will allow drivers to experience the full benefits of the 33 kilometre WestConnex network.”

So far more than 7000 workers and sub-contractors have been involved in the project. There are currently 1100 people working on the tunnels and 400 contracts signed with NSW based suppliers.

WestConnex CEO Andrew Head said the M4-M5 Link Tunnels currently have 28 roadheaders in operation.

“The M4-M5 Link is utilising the largest number of roadheaders on a single project anywhere in Australia, each progressing at around 25 metres per week,” Head said.

“Around 25 per cent of the road pavement has now been laid and the mechanical and electrical fitout of the tunnels is also under way.”

The tunnels are due to be open to the public in 2023, saving up to 40 minutes on a trip between Parramatta and the Sydney Airport.