Acceleration Lane Upgrade – Anstey Road and Mandurah Road

  • Repairs and roadworks
  • Planning and design

Project summary

In partnership with Main Roads Western Australia, the City is proposing upgrades to the Anstey Road and Mandurah Road intersection. Community feedback is sought on the proposed works.

The City of Rockingham, in partnership with Main Roads Western Australia, is proposing upgrades to the Anstey Road and Mandurah Road intersection in Secret Harbour. The works include a new left‑turn slip lane from Anstey Road and an acceleration lane on Mandurah Road, designed to reduce rear‑end crashes, improve safety, and ease morning peak congestion.

What is being proposed?

The proposed works will include:

  • New left‑turn slip lane at Anstey Road
  • Extension into an acceleration lane on Mandurah Road
  • Additional street lighting
  • Minor kerb, pavement and line marking works

View the concept plan shown below to see the proposed works.

Share your thoughts

We invite you to provide feedback by emailing customer@rockingham.wa.gov.au by close of business (COB) on Thursday 12 March 2026.

Pending consultation outcomes, works are expected to begin in the 2026/2027 financial year.

FAQs (Frequently asked questions)

Why is the City constructing an acceleration lane on Mandurah Road when it is managed by MRWA?

We are delivering this project as a medium‑term solution to address congestion and improve road safety. As the service level experienced by road users on Anstey Road becomes unacceptable and the risk of crashes increase, the City is proceeding with the project only after securing funding from the state government.

Why isn’t the intersection being signalised instead?

As Mandurah Road is managed by MRWA, any future traffic signals would need to be delivered by them. MRWA has advised that signalisation of this intersection is not currently a high priority. Because of this, the City is progressing interim upgrades.

Signalisation has been one of the City’s advocacy priorities for several years, and we will continue to raise it with MRWA.

Why isn’t the right turn lane into Anstey Road being extended?

As Mandurah Road is under MRWA’s management, any changes to the right‑turn lane would be part of a future upgrade by MRWA.

Most crashes at this intersection relate to the left‑turn movement from Anstey Road onto Mandurah Road. The current upgrade focuses on improving that movement.

It is understood that the right‑turn lane will be extended when traffic signals are installed by MRWA in the future, although there is no confirmed timeframe at this stage.

Will the speed limit at the intersection change?

No, the speed limit will remain the same. However, the new left‑turn slip lane and acceleration lane are expected to significantly improve safety.

What traffic management will be in place during construction?

Traffic Management will be required throughout the project to keep motorists and workers safe. Although much of the work will be carries out off the road, there will still be times when:

  • Lanes on Mandurah Road need to be closed
  • Turning movements from Anstey Road are restricted
  • Detours are in place.

We understand these works can affect travel times and will schedule higher‑impact activities during off‑peak periods where possible, including night works.

Is the lighting across the whole intersection being upgraded?

No, existing lighting will stay in place. However, additional lighting will be installed to support the new left‑turn and acceleration lanes.

Will a noise wall be built between the new acceleration lane and nearby properties?

No, a noise wall will be considered in the future as part of the intersection signalisation upgrade by MRWA.

Where is the funding from?

The project is two‑thirds funded by the State Government.

Location

Intersection at Anstey Road and Mandurah Road

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