Guerrilla cycling activists who say they are sick of waiting for a Perth council to take action have spray-painted bike priority markings in the dead of night on a road they say is dangerous.

The group struck overnight on Rutland Avenue in Victoria Park, which local Maxine Drake said was a recognised bikeway, but was not marked as such.

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The road connects existing cycle paths that lead to the city and through Victoria Park into the City of Canning.

The activists ventured out in darkness on Tuesday night to spray paint the markings. ( Supplied: Maxine Drake )

"We are at risk along this stretch of road," Ms Drake said.

She said the local council had consulted on a bike plan for the area, but had told community members it would be some years before they could act.

The fresh stencilling work was obvious along Rutland Avenue in the light of day. ( ABC News: Rebecca Trigger )

Ms Drake said the activists had not painted lanes, which would be dangerous, but rather bike symbols to indicate to cars that cyclists used the road.

"It will indicate to motorists that they're on our turf, not we're on theirs," she said.

Ms Drake said she understood the markings were "breaking the rules" but feared without them, people would be at risk.

"[It's] a very light-touch thing really ... but from our point of view it's a safety issue," she said.

She said one of their cycling crew was knocked off her bike a few weeks back on the road, and hopes the unofficial markings will prompt the council to act.

Town of Victoria Park Mayor Trevor Vaughan said he understood why the group had done it.

"I can understand the frustration, in fact I've cycled that very often myself," he said.

"The town has for the last 15 years been trying to get the funds to put in a shared cycleway along there."

But he said they had not been able to secure the funding from the State Government.

More Perth cycle blackspots may be targeted

Maxine Drake says the stretch of road is putting people at risk. ( ABC News: Rebecca Trigger )

Ms Drake said she understood the activists may strike again — in other parts of the city where cyclists were being put in harm's way.

"What you have is a whole heap of other bicycle infrastructure that is established then left," she said.

"There's all sorts of places you might want to hit with another symbol."

While Perth was streaks ahead of the eastern states in terms of cycling lanes and infrastructure, but much of it was not connected, Ms Drake said.

"I think in the time I've been in Perth the promulgation of cycling facilities has been fantastic, there's probably no better time to ride a bike," she said.

The Labor Government pledged to roll out a one-metre trial in Perth requiring drivers to leave at least a one-metre gap when overtaking cyclists in speed zones up to 60 kilometres per hour, and 1.5 metres on roads with higher speed limits.