WestConnex is the largest transport and urban renewal project in Australia and is a critical part of the New South Wales Government’s integrated transport solution, providing public transport and road infrastructure to keep Sydney moving. The project will provide relief to the hundreds of thousands of road users struggling in traffic every day and help return local streets to local residents. WestConnex will link Sydney’s west and southwest with the city, airport, and port in a continuous motorway.
WestConnex M4 East is Stage 1 of WestConnex and consists of two new 5-kilometer-long (3.1 mi), three-lane tunnels to extend the M4 from Homebush Bay Drive to Parramatta Road and the City Link West. M4 East also includes interchanges at Concord Road and City Link West that required underground ramps and caverns.
McMillen Jacobs Associates provided the geotechnical and structural detailed design of temporary and permanent supports for the mainline tunnels including water-resistant linings, cross passages, breakdown bays, substations, portals, ventilation shafts and tunnels, and temporary access tunnels. McMillen Jacobs also provided construction phase services. The WestConnex M4 East tunnels were constructed by the CPB Samsung John Holland Joint Venture (CSJ) and completed in 2019. Construction Cost: AUD$2.86 B