M4-M5 Link Tunnels

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M4-M5 Link Tunnels

(Haberfield to St Peters)

Also referred to as M4-M5 Link Mainline Tunnels.

Tunnels connecting the New M4 at Haberfield and the New M5 at St Peters. 

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. 

Community Information Sessions  

Session 1

Wednesday, 27 March
4.00pm to 7.00pm
158 Australia Street, Newtown

Session 2

Saturday, 30 March
10.00am to 1.00pm
M4-M5 Link Community Information Centre - 201 Parramatta Road, Haberfield

    Project history 

    Project stats

    Current status: Approved
    Construction start: 2018
    Open to traffic (pending planning approval): Early 2023^

    * 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

    Industry partners

      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

    Local updates

    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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    FAQs See all

    We fully recognise the importance of Sydney Park and the investments that the City of Sydney Council and others have made in recent years.

    A strip of land owned by Roads and Maritime Services adjacent to Sydney Park is being used to widen Euston Road as part of local road upgrades. This is not part of Sydney Park.

    As outlined in the City of Sydney’s own management plan for Sydney Park, this land is dedicated road space and has been subject to a long-standing road widening reservation.

    A small boundary strip, adjacent to the road reserve, is also required for the local road widening, however this is more than offset by the additional 8.5 hectares of open green space being created at St Peters Interchange.

    Two hectares of this open green space will be directly connected to Sydney Park via a land bridge over Campbell Road.

    The M4-M5 Link Concept Design released on 12 May 2017 includes:

    • a proposed alignment for the main tunnels, Rozelle Interchange, Iron Cove Link and indicative tunnel depths for each of these areas
    • a range of options for construction sites and amenities
    • the proposed location of surface connections and facilities, including ventilation outlets
    • details of active transport (walking and cycling) improvements
    • draft masterplans for the Rozelle Rail Yards and St Peters, as well as a concept plan for Victoria Road near the Iron Cove Bridge.

    Geotechnical investigations involve taking core samples from the earth to understand the conditions underground and develop a geological profile of the area. 

    We carry out geotechnical drilling along the WestConnex corridor, concentrating on locations where information on the ground conditions is not already available.

    Geotechnical investigations involve:

    • Identifying underground services and utilities and marking out locations for each borehole.
    • Setting up a safe work area with appropriate environmental controls.
    • Managing traffic and pedestrians where required to ensure the safety of motorists, residents and workers.
    • Collecting borehole soil and rock samples.

    The information gathered helps to inform our designs, and work out the best sub-surface conditions for underground road tunnels.