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.

Project stats

Project value^$497 million^
Current statusIn construction 
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

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FAQs See all

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

We undertake noise modelling for all of our projects, to predict noise levels after the project opens to traffic.

On some sections of WestConnex, new and upgraded noise walls will be installed to reduce the impact of traffic noise. Sometimes noise walls are not practical or may not be enough to effectively mitigate the expected noise. When this happens, properties may also be eligible for acoustic treatments to reduce road traffic noise. Our teams discuss this option directly with relevant property owners.

Tolls will be introduced on the M4 between Church Street, Parramatta and Homebush Bay Drive, Homebush when this section opens to traffic in 2017. 

Tolls will apply to new sections of WestConnex, including the M4 East, New M5 and M4–M5 Link once these new motorways open to traffic between 2019 and 2023. 

We are also carrying out minor upgrades to the M5 East and a toll will also be introduced on this motorway to account for the massive improvements in travel time and reliability motorists will experience as a result of WestConnex. 

To maintain access to Sydney Airport’s International Terminal, trips using Marsh Street ramps will remain toll free.