The NSW Government, Transurban and the M7 Westlink Shareholders (the Project Sponsors) are building an underground tolled motorway linking the M1 Pacific Motorway at Wahroonga to the Hills M2 Motorway at West Pennant Hills. The $3 billion project consists of a construction budget of $2.65 billion in addition to land and project delivery costs. The project is funded through toll charges with a contribution of $577.3 million from the NSW Government and $412.3 million from the Australian Government.

Project overview

NorthConnex will provide twin motorway tunnels around nine kilometres in length with a height clearance of 5.1m and a speed limit of 80 km/h. Each tunnel will be built with long term capacity for three lanes, but will initially operate with two lanes and a breakdown lane in each direction.

As part of NorthConnex, integration work along the Hills M2 Motorway is under way to allow the safe merge of traffic from the tunnel onto the Hills M2 Motorway via a new westbound lane from Pennant Hills Road to the Windsor Road interchange.

Project features

  • Twin nine kilometre motorway tunnels each with a three lane capacity for future traffic growth
  • A northern interchange at Pennant Hills Road and the M1 Pacific Motorway
  • A northern ventilation outlet and support facilities located within and immediately adjacent to the existing M1 Motorway corridor 
  • A southern interchange at Pennant Hills Road and the Hills M2 Motorway
  • A motorway control centre, ventilation outlet and support facilities located near the southern interchange
  • Integration work on the Hills M2 Motorway to provide an extra 3.5 km lane and bridge widening works from Pennant Hills Road to the Windsor Road interchange
  • On and off-ramps linking the tunnel and the existing M1 Pacific Motorway, north of Edgeworth David Avenue
  • A switching station on Coral Tree Drive to power the tunnel and support facilities
  • Two tunnel support facilities to provide air intake systems, emergency smoke extraction outlets and substations.

Key benefits

NorthConnex will deliver significant benefits to local communities by easing congestion and removing around 5000 trucks daily from Pennant Hills Road. This will help improve safety, local air quality and reduce traffic noise.

Motorists will be able to travel from Newcastle to Melbourne without a single set of traffic lights, reducing travel times for motorists and delivering state and national freight efficiencies.  

The motorway will provide opportunities to improve public transport travel times and services around Pennant Hills Road. 

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