M4-M5 Link Tunnels
The M4-M5 Link is being delivered in two stages:
- Stage one - construction of the M4-M5 Link Tunnels between the New M4 at Haberfield and the New M5 at St Peters and stub tunnels to the Rozelle Interchange. This stage is being managed by Sydney Motorway Corporation.
- Stage two - construction of the Rozelle Interchange and Iron Cove Link. This stage is being managed by Roads and Maritime Services.
The M4-M5 Link Tunnels project is the final and most critical component of WestConnex, featuring twin tunnels between the New M4 at Haberfield and the New M5 at St Peters. Each tunnel will be approximately 7.5 kilometres long and able to accommodate up to four lanes of traffic in each direction. The M4-M5 Link Tunnels will be delivered as a stand-alone project, and provide an additional 2.5 hectares of green space in St Peters.
Environment and planning
The M4-M5 Link Tunnels received NSW planning approval in April 2018.
- 13 June 2018 - Lendlease Samsung Bouygues Joint Venture (LSBJV) was selected as the preferred tenderer for construction of the M4-M5 Link Tunnels.
- 27 April 2018 - Planning approval for the M4-M5 Link project was received from the NSW Minister for Planning.
- 5 February 2018 - The M4-M5 Link Submissions and Preferred Infrastructure Report released.
- 18 August - 16 October 2017 - The M4-M5 Link Environmental Impact Statement was on public exhibition for a period of 60 days.
- 18 August 2017 - M4-M5 Link feedback report released.
- May - June 2017 - Community information sessions hosted across the M4-M5 Link project area, to support the release of the M4-M5 Link Concept Design.
- 12 May 2017: M4-M5 Link Concept Design released for community feedback.
- March 2017: Sydney Motorway Corporation lodged the M4-M5 Link State Significant Infrastructure Report Addendum 2.
- 11 November 2016: Minister for Roads Duncan Gay announced new design features for the M4-M5 Link, with potential for the M4-M5 Link twin tunnels to be completed early, capacity increasing from three to four lanes in each direction and exit and entry ramps at Camperdown removed.
- 15 November 2016: The Community Feedback Report containing community feedback and ideas gathered through consultation in July and August 2016 was released.
- 21 November 2016: Expressions of interest for contractors to design and construct the M4-M5 Link main tunnel works were called.
- September 2016: Sydney Motorway Corporation lodged the M4-M5 Link State Significant Infrastructure Report Addendum, which includes the Rozelle interchange and Iron Cove Link.
- August 2016: Community ideas sessions hosted across the M4-M5 Link project, supported by an online collaborative map.
- Early 2016: Geotechnical and other surveys and investigations underway to inform the early design options for the project.
- Early 2016: Consultation with key stakeholders started.
- March 2016: The Department of Planning and Environment issued the Secretary’s Environmental Assessment Requirements for the project.
- January 2016: Sydney Motorway Corporation lodged the M4-M5 Link State Significant Infrastructure Application Report, which is the first step in the planning approval process.
- November 2015: WestConnex Updated Strategic Business Case published, including a proposal for the M4-M5 Link.
- September 2013: WestConnex Strategic Business Case – Executive Summary published, including an early proposal for the M4-M5 Link.
Current status: Approved
Open to traffic (pending planning approval): Early
* Based on WestConnex Road Traffic Model V2.1, WestConnex Updated Strategic Business Case, November 2015
^ WestConnex Updated Strategic Business Case, November 2015
^^ Between Haberfield and Rozelle
Design and construct contract: Lendlease Samsung Bouygues Joint Venture
Operations and maintenance contract: Commitment deed in place with Fulton Hogan and Egis Joint Venture
Tolling contracts: TBA
What's happening now
Delivery improvements reduce impact of M4-M5 Link construction
An innovative approach to the delivery of the WestConnex M4-M5 Link tunnels has reduced community impacts and decreased the number of required construction sites.A WestConnex...
Major milestone for M4-M5 Westconnex tunnel link
The NSW Government has today announced the successful tenderer for construction of the mainline tunnel of the M4-M5 Link as the LSB Joint Venture, comprising Lendlease...
M4-M5 Link investigations under way
Planning work for the proposed M4-M5 Link is progressing this month with geotechnical investigations scheduled to get under way along the corridor.The work involves collecting...
Rozelle Interchange shortlist announced
Construction of the M4-M5 Link, the most important stage of WestConnex is moving ahead with applicants shortlisted to build the WestConnex Rozelle Interchange and Iron Cove...
Final stage of WestConnex link approved
The third and final stage of WestConnex, linking the M4 and M5 motorways has been approved by the NSW Government, and will complete Australia’s largest road project.Minister...
WestConnex and GIANTS kicking goals for western Sydney communities
Sydney Motorway Corporation’s (SMC) WestConnex community partnership with the GIANTS will reach new heights this year with the club’s successful Stand Tall workshops to be...
Horn of Africa migrants and refugees in western Sydney buoyed by expansion of swim safety program
Swim program, “Swim, Survive and Socialise” for the children of East African migrants and refugees living in western Sydney has been expanded, empowering a new generation...
Applications open for community grants
Community groups and organisations are being encouraged to apply for the next round of Sydney Motorway Corporation’s (SMC) Community Grant Scheme which supports local...
To learn about work in an area or for a project, you can access a range of documents including work notifications, management plans, compliance tracking reports, maps and permits.
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Widened the existing M4 Motorway from Parramatta to...
Extending the M4 Motorway in tunnels between Homebush and...
King Georges Road Interchange Upgrade
Upgrade of the King Georges Road Interchange between the M5...
Photos & Videos
FAQs See all
All Sydney road tunnels have management plans that involve monitoring tunnel air quality 24-hours a day and they must comply with independent pre-determined guidelines for in-tunnel air quality.
The WestConnex air quality management plan will follow stringent guidelines and take account of the final design of the route, the length of each section of tunnel and the location of ventilation outlets.
For more information, visit Air quality.
Traffic modelling tells us the expected demand for WestConnex and the number of traffic lanes needed. The motorway has been designed to meet traffic demand now and in the future.
The number of lanes varies across the project:
- M4: the M4 Motorway has been widenedfrom three lanes in each direction to four lanes in each direction between Parramatta and Homebush. The new M4 East tunnels between Homebush and Haberfield will be three lanes in each direction.
- New M5: when the tunnels open, there will generally be two lanes in each direction between Kingsgrove and St Peters. The tunnels can accommodate three lanes in each direction in future, with additional approvals needed for this change.
- M4–M5 Link: The M4-M5 Link will provide twin underground tunnels with four lanes in each direction between Haberfield and St Peters.
Sydney Motorway Corporation's (SMC) Community Connections Program includes the SMC Community Grant Scheme, which provides grants of up to $10,000 to local groups such as such as schools, sporting associations and social enterprises located in and around the WestConnex project area.
Grant applications are assessed against guidelines, which consider areas including community legacy, connecting communities, building capacity and helping people.
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