History of the M4 – M8 extensions
The new 7.5-kilometre tunnels are a critical component of WestConnex and will connect the M4 at Haberfield to the M8 at St Peters. Since site establishment works began in 2018, the project has achieved many significant milestones over the past four years
2018
June 2018
Contract awarded for the M4-M5 Link Tunnels
October 2018
Site establishment work began at the St Peters and Camperdown sites
2019
May 2019
Tunnelling began, the first roadheaders were deployed at the dive sites located in Haberfield, Annandale and St Peters
November 2019
Work commenced on the construction of the Campbell Road Ventilation Facility
2020
May 2020
The project entered peak excavation with all 28 roadheaders working around the clock to remove around 10,000 tonnes of spoil every day
August 2020
Mechanical and Electrical work commenced, installing the first components of the deluge system (the first manifold installed at Pyrmont Bridge Road Tunnelling site)
2021
January 2021
First breakthrough between the M4-M5 Link Tunnels project and the WestConnex M8
October 2021
Energisation of the first substation at St Peters Interchange. This is one of six substations that were energised
2022
January 2022
The last of the 28 roadheaders used on the project was demobilised and removed from site
February 2022
Completed all three stages of the excavation process (heading, benching and excavating drainage channels) between Haberfield and St Peters
2023
Discover more about the M4 and M8 extensions
SMART motorways
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FAQs
Got a question? See our FAQ’s including the renaming, tolling, traffic, air quality and legacy & open space.
Sustainability
Sustainability is a key feature of the M4 and M8 extensions and has been embedded into the design, construction, and the operation of the motorway to enhance environmental and social practices and outcomes in the local community.