Perth motorists are notoriously bad mergers.

But surely this driver has a claim to being one of the worst.

The incident, on Mitchell Freeway southbound near Ocean Reef Road, was captured by motorcyclist Iain Graham’s helmet camera and sent to The West Australian as part of the Zero Excuses road safety survey.

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In the short video, a white four-wheel-drive mounts a kerb before continuing down an embankment — seemingly in an attempt to avoid the slow-moving freeway entry lane.

Mr Graham said it was something he had never seen before.

“I was doing my morning commute and the traffic was a little bit heavy — as you can see it is probably doing maybe 30-40km/h,” he said.

Motorcyclist Iain Graham filmed the incident. Picture: Steve Ferrier

“I’ve noticed this car jump over the kerb and come down that little embankment.

“It didn’t seem to be provoked or anything like that and the guy just started driving normally afterwards.”

Mr Graham said he had submitted the video as an example of shocking road behaviour by WA drivers.

“It definitely looks like impatience because the lane that was merging with the freeway was very, very slow,” he said. “I’ve seen people cut across to merge a little bit early but nothing like that before.”

“You can’t see it in the video, but I was looking in the rear-view mirror to see if they were going to be doing anything else crazy and they seemed to drive quite normally after that.”