Two grade-separated roundabouts could be built at Armadale Road-Solomon Road and further east at Armadale Road-Tapper Road.
This work will form part of the $237 million freeway flyover project linking Armadale Road to North Lake Road.
In a report to councillors earlier this month, Cockburn strategic planning manager Andrew Trosic said some driver education would be needed.
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READ NOWThat was because in some case “drivers will need to spiral the roundabout twice in order to move from the inner circle to the outer circle”.
Mr Trosic said the proposed intersections “were essentially just like any other dual lane roundabout” and was confident drivers would adapt with the aid of line markings and signs.
A Main Roads WA spokeswoman moved to play down any perceived difficulties associated with the roundabouts.
“The proposed roundabout operates the same as all roundabouts in Perth. There is no need to circle twice,” she said.
“The term ‘spiral’ refers to the line-markings, which are designed to guide vehicles through the roundabout.”
She said MRWA has used spiral line markings in recent projects, including at Mandurah Road-Mandjoogoordap Drive and Nicholson Road-Yale Road-Garden Street.
As flagged by the City of Cockburn, the MRWA will consider an education campaign as the Armadale Road to North Lake Road Bridge project progresses.
“Whilst it will be a first for WA, ‘duck and dive intersections’ are used extensively throughout Europe,” the MRWA spokeswoman said.
Cockburn engineering and works director Charles Sullivan said the usual consideration would be needed by motorists.
“The main thing to remember is to exercise caution when traversing a dual-lane roundabout, the same as with any other such roundabout in Perth,” he said.
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