WestConnex is part of an integrated transport solution to address the needs of a growing city
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King George Road Interchange Upgrade reaches half-way milestone
Construction on the King Georges Road Interchange Upgrade, which will address one of Sydney’s worst pinch points, has reached the halfway point with completion on track for...
Have a say on the final stage of WestConnex
New inner west park and tunnel link announced
A large stretch of new parkland will provide significant green space for Sydney’s inner west and an underground connection will be built to take traffic off congested...
M4 night closures at Concord
NSW Government confirms funding strategy to deliver WestConnex
New M4 start of tolling
Changes to Sydney Motorway Corporation Board of Directors
First breakthrough on New M4 tunnels
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What's happening now
M4-M5 Link feedback report
The M4-M5 Link feedback report is available now.Sydney Motorway Corporation would again like to thank everyone who met and shared their ideas and feedback on the M4-M5 Link...
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M4 Widening
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...
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View and comment on proposed open space concepts along the New M4
The Legacy Project aims to provide safe, vibrant and high quality open spaces for communities impacted by the New M4 by delivering 5.76 hectares of additional land for...
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New M4 tolls
The new M4 is open. Stretching 7.5km between Parramatta and Homebush and having increased from six to eight lanes, there's now an even faster way to bypass 28 sets of...
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Seeking expressions of interest for the New M5 Air Quality Community Consultative Committee
Sydney Motorway Corporation (SMC) is in the process of establishing an Air Quality Community Consultative Committee (AQCCC) to provide input and advice on the location of air...
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M4-M5 Link Concept Design
Consultation on the M4-M5 Link Concept Design ran from 12 May to the 4 August 2017. This non-statutory 12-week consultation period sought to provide the community and other...
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Helping pre-schoolers have the best possible start to school
Sydney Motorway Corporation will help 20 pre-schoolers with hearing loss within the WestConnex corridor to go through The Shepherd Centre’s Ready Set Go school readiness...
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Fighting fit at any age
In January 2017, Sydney Motorway Corporation provided a grant to Concord Senior Citizens Club to purchase four new playing tables for its table tennis group, so the...
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Photos & Videos
M4-M5 Link: Rozelle Interchange and Iron Cove Link
M4-M5 Link mainline tunnels animation
First tunnel breakthrough - SMC exclusive
Community Connections Program
Engineers Australia Experience It! conference supported by WestConnex
New M4 tunnel breakthrough
WestConnex tunnelling update
Ramsay Street cut and cover
Keeping our city moving
Tunnelling begins at Bexley North
New green space in St Peters
Cleaning up the Alexandria landfill site
New inner west park and tunnel link
Upgrade at King Georges Road interchange takes shape
New life for historic sandstone
The Hulk finishes M4 Widening work
Angelo from Granville
M4 Widening equipment goes west
Tunnelling begins in Homebush
FAQs See all
Transferring vehicles from surface roads into free-flowing underground motorway tunnels will improve the air quality along existing surface roads where traffic is reduced.
For example, an independent air quality assessment detailed in the M4 East EIS found air quality will generally improve along the Parramatta Road corridor because of traffic shifting to WestConnex.
Motorists will have a smooth motorway to travel on, rather than being stuck in congested, stop-start traffic with traffic lights, and this will reduce emissions.
Our tunnels are also designed to reduce emissions, as they are generally flatter and less steep at the entries and exits.
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.
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.
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