Tonkin Highway Extension and Thomas Road Upgrade

Tonkin Highway to South Western Highway

Under constructionUnder Construction

Extending Tonkin Highway from Thomas Road to South Western Highway, and upgrading Thomas Road from Kargotich Road to Alexander Road, improving safety, connectivity, and freight efficiency for Perth’s growing south-east corridor.

Illustration of Tonkin Highway

What's happening

Early works are underway

Preliminary works have started across the project area, which are an important step in helping inform the design. During these works, intermittent verge closures and stop/slow arrangements will be required on various roads within the project area. These short-term impacts will be implemented during off-peak times (generally, 9:30am to 3pm, Monday to Friday) and will help increase safety for our workforce and the community.

What’s included?

  • Geotechnical investigations – testing ground conditions.
  • Potholing for service locating – identifying underground utilities.
  • Environmental investigations - surveys.

What to expect? 

You may see some of our work crews and vehicles accessing the road reserve at various locations along the alignment, Monday to Friday.

Short-term traffic management arrangements will be implemented as required to help increase safety for our workforce and the community.

Out of Hours works

To help support early investigation works, including pavement dipping and Cone Penetration Testing (CPT) within existing traffic lanes, works are scheduled from Monday 9 June to Friday 13 June 2025, between 7pm and 5am.

To facilitate these works, there will be intermittent and rolling lane closures on Tonkin Highway, between Rowley Road and Thomas Road (southbound) and Thomas Road, between Kargotich Road and Wungong South Road.

These works are required to be completed at night to minimise disruption to road users and are subject to change.

Speed limit reduction

To safely build access to our future site office, the speed limit will be reduced to 60 km/h on Mundijong Road between Kargotich Road and Adonis Street from 16 June 2025.

These works are subject to change.

To stay across the latest information don’t forget to subscribe to project updates and visit our Project Facebook Page.

 
Alleviate

pressure on surrounding roads

Reduce

travel times

Improve

road connectivity

Page last reviewed:  | Last updated: 

Acknowledgement of Country

The Government of Western Australia acknowledges the traditional custodians throughout Western Australia and their continuing connection to the land, waters and community. We pay our respects to all members of the Aboriginal communities and their cultures; and to Elders both past and present.

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