M4 Widening

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M4 Widening

(Parramatta to Homebush)

Widening the existing M4 Motorway from Parramatta to Homebush from three to four lanes in each direction.

Today, more than 100,000 vehicles a day use the M4. It is a notorious and frustrating bottleneck, with congestion for up to 13 hours a day just ask any motorist who sits in bumper-to-bumper traffic every day.

WestConnex M4 Widening involves building an additional lane in each direction on the M4 Motorway between Parramatta and Homebush. The project is about 7.5km long.

Environment and planning 

The M4 Widening received planning approval in December 2014 and work started in March 2015.  


Project history

  • 15 August 2017 - Distance-based tolls commence on the new M4.
  • July 2017 - M4 Widening opened, one month toll-free.
  • February 2017: New viaduct open to traffic, with work on resurfacing old westbound carriageway underway.
  • January 2017: New interchange at Homebush Bay Drive opened to traffic. Cars travelling south on Homebush Bay Drive can access M4 Motorway westbound via a 'G-loop', removing two sets of traffic lights.
  • March 2015: Construction work on the M4 Widening started.
  • December 2014: The contract to build the M4 Widening was awarded.
  • December 2014: The project was approved by the Department of Planning and Environment subject to a number of conditions.
  • October 2014: A Submissions and Preferred Infrastructure Report was prepared in response to submissions received during the EIS exhibition period. The report was considered by the Department of Planning and Environment and informed the Minister for Planning, in the projects approval assessment.
  • August to September 2014: The M4 Widening Environmental Impact Statement was exhibited for community comment and a community update and environmental overview were prepared.
  • March 2014: A shortlisted of contractors to build the M4 Widening was announced. 
  • November 2013: Expressions of interest to construct the M4 Widening were issued.
  • October to November 2013: Community consultation was carried out on the motorway concept design and the feedback received is outlined in the M4 Widening Community Issues Report. 
  • September 2013: The planning application for the M4 Widening was lodged with the Department of Planning and Environment.

Project stats

Project value^$497 million^
Current statusOpen to traffic 
Construction startMarch 2015
Open to traffic2017
Current traffic projections*163,800* vehicles per average weekday by 2031

* Based on WestConnex Road Traffic Model V2.1, WestConnex Updated Strategic Business Case, November 2015
^ WestConnex Updated Strategic Business Case, November 2015

Industry partners

    Design and construct contract: CPB Contractors and Rizzani De Eccher Joint Venture
    Operations and maintenance contract: Maintenance during construction: CPB Contractors and Rizzani De Eccher Joint Venture
    Operations and maintenance after project completion: Fulton Hogan and Egis Joint Venture
    Tolling contracts: Roadside tolling equipment: Kapsch TrafficCom Australia
    Back-office services and systems: Roads and Maritime Services

     

     

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

For each WestConnex project, a series of documents including details of the measures to appropriately manage and reduce the impact of the project on local communities. These include: 

  • The Environmental Impact Statement (EIS) – the EIS explores the potential environmental impact and outlines measures to manage and reduce this impact based on best practice and expert advice. 
  • The Submissions Report – this responds to all feedback received on the EIS during exhibition. It provides additional mitigation measures needed in response to new information, additional assessment or community feedback. 
  • The Conditions of Approval – in approving each project, the NSW Minister for Planning issues a range of conditions that must be adhered to during and after construction, to ensure impact of the project is mitigated. 
  • The Construction Environmental Management Plan and sub plans – before we start major work, these are prepared to provide a detailed approach to the management of environmental issues. The Department of Planning and Environment must approve these before major construction work can start. They build on the mitigation and management measures established in the EIS, the Submissions Report and Conditions of Approval.

We always notify local communities before we start a new section of work and before we do any out-of-hours work. 

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.

WestConnex projects will open to traffic in stages between 2017 and 2023. See our Interactive map