John hollandJohn Holland

Connecting Sydney like never before.

Rozelle Interchange and Western Harbour Tunnel Southern Works

The $4.6 billion Rozelle Interchange and Western Harbour Tunnel is the missing link in Sydney’s WestConnex motorway – Australia’s largest road project. The Rozelle Interchange connects the extended M4 and the new M5 to the Anzac Bridge and Victoria Road in Sydney. The interchange will be a new underground motorway to the City West Link and provide an underground bypass of Victoria Road.

When complete the Rozelle Interchange will provide a new underground motorway network to connect some of Sydney’s busiest commuter corridors. It will reduce congestion in the inner west of Sydney and provide essential connections across Sydney. The project will also turn a disused railyard site into a vibrant green space with a new wetland, active transport links and recreation areas for all ages.

Consisting of 23kms of tunnel, four cut and cover tunnel portal structures, 12 bridges and two ventilation facilities connected to a fully undergrounded ventilation system, the Rozelle Interchange represents one of the most complex underground motorways ever undertaken. 

It will completely transform a disused rail yard site to deliver up to 10 hectares of green parkland space and provide new active transport options to the community.

Our team was recently awarded the Southern Tunnelling package of the Western Harbour Tunnel, extending the package of work to build a new connection across Sydney Harbour.

  • Customer
    Transport for NSW
  • Location
    Sydney, New South Wales
  • Specialisation
    Roads & bridges


    Mechanical & electrical
  • Start
  • End
This contract builds on our Transport Infrastructure projects in NSW including the New M4 Tunnels, Sydney Metro Northwest and the new tunnels under Sydney Harbour for Sydney Metro City and Southwest.
Our team has worked hard to transform lives. To date, over $68 million has been spent with Indigenous suppliers; socio-economic and environmental innovations have been delivered through an integrated approach to sustainability; and a focus has been placed on the health and wellbeing, inclusion and diversity and skills and training for every person who works on the project.
"This critical section of the WestConnex motorway will make Sydney more connected than ever before. We are proud to be part of a project that will make it easier for tens of thousands of motorists to get around every day.” Joe Barr, CEO John Holland


John Holland pays respect to the Traditional Owners and Custodiams of the land on which we work and live, and their connections to land, sea and community. We pay our respect to their Elders past and present and extend that respect to all First Nations peoples today.