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. 

    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

    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: 

    • New M4: the New M4 has been widened from three to four lanes in each direction between Parramatta and Homebush. The New M4 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 Tunnels: The M4-M5 Link Tunnels will provide twin underground tunnels with four lanes in each direction between Haberfield and St Peters.

    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.

    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.