The NSW Government today confirmed that once operational, the WestConnex M4-M5 Link project will be officially referred to as extensions of the M4 and M8 motorways.
Once complete, the 7.5 kilometre underground mega tunnels will connect the two motorways, providing a seamless link between Haberfield and St Peters and cutting travel times by up to 40 minutes between Western Sydney and Sydney Kingsford Smith Airport.
Minister for Metropolitan Roads Natalie Ward said the operational names aligned with the NSW motorways' numbering system, making it easier for motorists travelling across the broader network.
"We are in the final stages of one of the most significant road infrastructure projects ever undertaken in Australia," Ms Ward said.
"Naming the tunnels the M4 and M8 motorways will help motorists join the dots on the new and improved network when the tunnels open next year.
"Once complete, the tunnels will significantly improve connections between west and southwest Sydney, reducing travel times into the city for Western Sydney residents.
"This is all about making a real difference to people's daily lives, with our Government committed to providing them with the transport connections they need to move quickly and safely across our city."
The new link between the M4 and the M8 is expected to open in early 2023 and will connect to the Rozelle Interchange at the end of 2023, marking the completion of Australia's largest road infrastructure project, WestConnex.
The project will also include future links to the Western Harbour Tunnel, Sydney Gateway and the M6, to better connect communities across the city and improve freight routes.
