Upgrading Warringah Freeway to enhance connectivity and urban mobility across Sydney's north.
DT Infrastructure and CPB Contractors have been engaged by Transport for NSW in a joint venture to deliver the Warringah Freeway Upgrade, Australia’s most complex freeway.
Scheduled for completion in late 2026, the freeway upgrade will significantly improve travel times, reliability and safety for more than 200,000 daily road users, while easing congestion across Sydney’s northern transport network.
The project will also establish connections to the future Western Harbour Tunnel and Beaches Link, improve public transport with a continuous southbound bus lane to the Sydney Harbour Bridge, and deliver approximately 2.5 kilometres of new and upgraded cycleways and pedestrian paths.
These active transport links will integrate with surrounding public transport infrastructure, including the new Victoria Cross metro station at North Sydney.
Scope
The Warringah Freeway Upgrade is revitalising a 4-kilometre corridor through North Sydney, delivering extensive road, bridge and interchange work to improve safety, capacity and traffic flow on one of Sydney’s busiest road networks.
Construction has been carefully staged to minimise disruption to commuters while maintaining operations.
Key elements of the scope include:
- Upgrading four kilometres of the existing Warringah Freeway to reduce merging and improve safety and traffic efficiency.
- Improving interchanges at critical road connections into North Sydney.
- Constructing a new northbound on-ramp to alleviate pressure on existing access points.
- Integrating the existing road network with the future Western Harbour Tunnel and Beaches Link.
- Delivering a continuous southbound bus lane to the Sydney Harbour Bridge.
- Constructing 2.5 kilometres of new and upgraded cycleways and pedestrian paths, integrated with public transport networks.
- Constructing a 47-metre-long Mount Street underpass using an ‘upside down’ construction method to maintain pedestrian access throughout works.
- Replacing an aging shared user bridge with a wider structure incorporating privacy screens and improved accessibility.
4km
4 km of freeway upgraded.
3,000m3
Excavated more than 3,000 cubic metres of sandstone using a remote-controlled mining.
200,000
Road networks for 200,000+ vehicles per day maintained during construction.
20%
20% of electricity from renewables or Greenpower.
2.5km
2.5 km of new and upgraded cycleways and pedestrian paths.
Social impact
The Warringah Freeway Upgrade is improving daily travel for Sydney commuters through safer road layouts and new walking and cycling links that enhance connectivity and community access.
Some of the key social impact outcomes include:
- Safer, more reliable travel for over 200,000 daily road users.
- Improved walking and cycling connectivity, supporting active transport and community access.
- A new Mount Street underpass connecting to the Cahill Expressway, benefiting 10,000 motorists every day.
- Continued operation of the road network during construction through innovative traffic and work-zone. management, including the QuickChange barrier system.
The project has also embedded sustainability and community initiatives throughout construction, including:
- Use of recycled materials in asphalt, replacing virgin sands.
- Sourcing 20% of project electricity from renewable energy or Greenpower.
- Celebration of Indigenous culture through rain-inspired public artwork integrated into the Falcon Street shared user bridge.
- Delivery of community programs such as the SBAT (School-Based Apprenticeship and Traineeship) initiative with local schools.