The Northern Road Upgrade, Peter Brock Drive to Mersey Road

The Australian and NSW governments are planning to upgrade The Northern Road as part of the Western Sydney Infrastructure Plan (WSIP), a 10 year, $3.6 billion road investment program.

The Northern Road Upgrade will deliver new and upgraded roads to support integrated transport in the region and capitalise on the economic benefits from developing a western Sydney airport at Badgerys Creek. It would also improve safety, increase road capacity and reduce congestion and travel times in the future.

This second stage covers about 11.5km between Peter Brock Drive, Oran Park and Mersey Road, Bringelly, including the intersection of The Northern Road and Bringelly Road which will be built as a grade separated interchange (overpass).

The Northern Road, south of Bringelly Road and Greendale Road intersection.

Updates and announcements

The detailed design was finalised in March 2016. This upgrade now includes the proposed grade separated interchange at Bringelly Road and The Northern Road. For more information, read our latest community update (PDF, 2MB).

This project is also being packaged for construction delivery with the Bringelly Upgrade, King Street to The Northern Road.

Project background

The Northern Road Upgrade between Peter Brock Drive, Oran Park and Mersey Road Bringelly is about 11.5km long. The Northern Road will be one of the main arterial transport corridors within Sydney’s South West Growth Centre. As residential and commercial development occurs, the amount of traffic in the area is expected to increase on The Northern Road. The Northern Road Upgrade will also support a western Sydney airport at Badgerys Creek.

Roads and Maritime displayed the concept design and Review of Environmental Factors in October 2012. Community feedback received during the environmental assessment and our responses are provided in a Submissions Report.


The project will provide a range of benefits including:

  • Increased capacity to cater for future population growth in the area
  • Improved safety for motorists by:
    • Building new intersections with traffic lights to access precincts
    • Building a central median to separate opposing traffic flows
    • Building turning lanes at intersections
  • Improved safety for cyclists and pedestrians through an off-road shared path
  • Improved travel times and capacity to accommodate future development needs
  • Access to future South West Priority Land Release Area along The Northern Road
  • Improved access and travel times for road freight in Sydney’s south west.

Key features

The main features are:

  • Widening from a generally two lane to a four lane, divided road with a 4 metre wide shoulder and wide central median allowing for widening to six lanes, if required in the future
  • A grade separated intersection at Bringelly Road to the east of Bringelly Village shops and the existing intersection with Bringelly Road/Greendale Road
  • A speed limit of 80km/h
  • A three metre wide shared pedestrian/cyclist path on the eastern side
  • Adjustments to public facilities such as gas, electricity, water, and telecom services along the route
  • Designated turning lanes and bicycle and pedestrian crossing provisions at traffic lights
  • Upgrade and/or tie in with local roads where required
  • Bus priority lanes at traffic lights and indented bus bays
  • Temporary U-turn facilities at some future precinct link roads
  • Existing properties along The Northern Road will continue to have left in/left out access until precinct development takes place
  • Nine intersections to be upgraded with new traffic lights
  • Existing bridge over Thompson Creek will be replaced for southbound traffic and a new bridge will be constructed for northbound traffic.

What happens next?

Key activities for 2016 include:

  • Shortlist Expression of Interest applications and invite tenders
  • Property surveys
  • Contacting potentially affected property owners about property adjustments and acquisition.

Roads and Maritime is progressing the project with the successful construction tender winner due to be announced in late 2016/early 2017.

We expect to start construction in early to mid-2017 and open the road to traffic in 2019.

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