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Tonkin Highway Extension and Thomas Road Upgrade

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Tonkin Highway Extension and Thomas Road Upgrade

Welcome to the official Main Roads Tonkin Highway Extension and Thomas Roads Upgrade Project Community Page.

For more information on the project, please visit our website and to subscribe for updates.

09/06/2026

Are you a WA artist or creative with a connection to Byford, Serpentine Jarrahdale or the surrounding area?

Expressions of Interest are now open to design integrated artwork for the anti-throw screens on the Thomas Road Bridge, delivered as part of the Tonkin Highway Extension and Thomas Road Upgrade Project.

This is the first opportunity under the project’s broader Public Art Program, with more artist opportunities expected to be released progressively.

More information is available on the project website - https://www.mainroads.wa.gov.au/projects-initiatives/all-projects/metropolitan/tonkin-highway-extension-and-thomas-road-upgrade/

EOIs close 5pm, Monday 29 June 2026.

05/06/2026

We’ll be hosting a small pop-up at the SJ Farmers Market. A great opportunity to meet some of the team and ask any questions you may have about the project.

Saturday 13 June 2026 | 8am to 12pm
2 Paterson Street, Mundijong

Have questions but can’t attend the market?
Get in touch at [email protected] or call 138 138.

03/06/2026

Nightworks are required on Thomas Road, between Wungong South Road and Hay Road (see map in comments) between Thursday 4 June and Friday 11 June 2026, from 7pm to 7am. (with a contingency period from Sunday 14 June to Sunday 28 June 2026).

These works are necessary to undertake streetlight removal and minor road modifications, including median removal and asphalting. Following these works, traffic will be switched to the eastbound lanes, allowing permanent construction to start on the westbound lane and shared path realignments.

To facilitate construction of the new shared path alignment, a small section of the existing noise wall along the bridge will be temporarily removed.

02/06/2026

A section of the Thomas Road Shared Path between Hay Road and Blackberry Ramble will be closed from Thursday 4 June 2026 until May 2027. Path users are encouraged to use the detour route which will be signed along the way (see map in comments). Please note the Armadale Rail PSP will remain open.

The closure is to ensure a safe work environment while we deliver critical infrastructure upgrades along Thomas Road and has been planned in consultation with the Department of Transport and WestCycle.

20/05/2026

An exciting milestone has been reached on the project, with the first part of the pedestrian and cyclist underpass structure successfully installed on site.

This is one of seven trapezoid units to form this underpass. The shape improves weight distribution by directing loads from the road above down through the angled walls and into the wider base of the structure. This design also reduces the amount of material required compared to traditional rectangular structures, improving construction efficiency while still delivering a strong and durable outcome for the future road network.

Importantly, installation of this structure is a key step in the overall construction sequencing. It will allow the future Tonkin Highway southbound connection onto Thomas Road to be built, which will play an important role in maintaining vehicle movements through the area during construction of the new Thomas Road bridge over Tonkin Highway.

Great to see another significant piece of infrastructure now in place as progress continues across the project.

18/05/2026

Rock pitching works are now underway!

You may notice crews placing rocks onto prepared foundations along embankments and drainage areas across the project. This process, known as rock pitching, creates a strong layer that stabilises the ground and helps protect against erosion.

By slowing and directing stormwater flows, rock pitching also improves drainage performance and helps maintain the shape and integrity of embankments and drains over time, especially during periods of heavy rain.

It’s a durable, low-maintenance solution and a key part of the upgrades to the southern drainage system along Thomas Road.

14/05/2026

You may have noticed nightworks underway along Thomas Road, between Masters Road and Plaistowe Boulevard. These works are necessary to support road widening, which will maintain traffic flow as permanent construction continues on the westbound lanes.

These nightworks are expected to continue intermittently from Friday 15 May 2026 to Sunday 7 June 2026. Following completion of the works, the traffic will be switched onto the eastbound lanes. This traffic switch will improve safety for both road users and our workforce by separating live traffic from active construction zones, allowing works to continue more efficiently and with reduced risk.

07/05/2026

To support construction of the new Mundijong Road and Tonkin Highway intersection, Mundijong Road is proposed to be temporarily closed between Pure Steel Lane and Adonis Street from June 2026 to December 2026.

This temporary closure will allow Mundijong Road to be aligned to meet the Tonkin Highway intersection, provide a safe, protected work zone, and minimise interaction between traffic and the worksite.

In addition, the Lampiter Drive and Mundijong Road intersection will be permanently closed, with emergency egress maintained at the end of Lampiter Drive.

What to expect:
• Pure Steel Lane and Adonis Street will remain open during these works
• Signed detour route through Bishop Road (see map in comments)

The project is working closely with the Shire of Serpentine Jarrahdale and the Department of Fire and Emergency Services (DFES) to ensure emergency access routes are maintained during construction and are incorporated into the final road design. Bushfire safety and emergency response are key considerations in the planning process.

Public submissions on this planned closure are now open and can be made in writing to the Shire of Serpentine Jarrahdale by 5pm, 3 June 2026.

Submissions should be addressed to:

Chief Executive Officer
Shire of Serpentine Jarrahdale
6 Paterson Street, Mundijong WA 6123
Email: [email protected]

https://www.sjshire.wa.gov.au/publicnotices/tonkin-highway-extension-and-thomas-road-upgrade-proposed-temporary-road-closure-mundijong-road-between-pure-steel-lane-and-adonis-street/10195

06/05/2026

We recently had the opportunity to meet with students at Byford Secondary College.

We visited a Year 12 Mathematics class to talk about the wide range of careers in construction, and how maths is used every day in delivering major infrastructure projects like ours, from planning and design through to construction on site.

It was great to hear such thoughtful and interesting questions from the students, and to discuss how the skills they’re developing in the classroom are applied in real world project delivery.

We really value opportunities like this to support local students and help them explore future career pathways in the construction industry.

01/05/2026

Thank you to everyone who provided feedback on the recent Public Notice issued by the Shire of Serpentine Jarrahdale regarding the planned closure of Orton Road. In response, we’ve reviewed the proposed staging of works and identified an opportunity to delay the start of these works. The planned closure will now be from mid-June 2026 to September 2026.

These works may slightly overlap with Water Corporation’s bridge upgrade on Gossage Road, depending on construction progress.

This closure will enable our team to construct the new Orton Road connection to Timbrel Road (formerly Hopkinson Road), while maintaining a safe, protected work zone and minimising interaction between traffic and the worksite. This connection will also support future stages of work as we continue construction of the new Tonkin Highway and Orton Road intersection.

What to expect:
• Bullock Drive and Timbrel Road will remain open
• Local access to properties on Orton Road will be maintained
• Properties east of the closure will be accessed via Timbrel Road
• Properties west of the closure will be accessed via Orton Road from Kargotich Road (see map in comments)

We are working closely with the Shire of Serpentine Jarrahdale and the Department of Fire and Emergency Services (DFES) to ensure emergency access routes are maintained throughout construction and considered in the final road design. Bushfire safety and emergency response remain key priorities in our planning.

Address

Waterloo Crescent
Perth, WA
6004

Opening Hours

Monday	9am - 4pm
Tuesday	9am - 4pm
Wednesday	9am - 4pm
Thursday	9am - 4pm
Friday	9am - 4pm

Website

http://www.mainroads.wa.gov.au/THETRU

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