PROTESTERS have occupied the front steps of Premier Colin Barnett's electoral office in Cottesloe this morning as part of ongoing demonstrations against the Roe 8 project.

About 50 people tried to enter the office about 9am but were unable to get in because it was locked.

They then blocked the entrance to the building on Stirling Highway for about an hour before police moved in and began issuing move-on notices.

By 11am most protesters had left but not before causing major traffic congestion along Stirling Highway.

Main Roads had to close one lane while officers from the regional operations group removed the final protester who had locked herself to the handrail with a large metal bolt.

Camera Icon Protesters have occupied the front steps of Premier Colin Barnett's electoral office in Cottesloe this morning as part of ongoing demonstrations against the Roe 8 project.. Credit: PerthNow, Rourke Walsh

Dr Liana Joy Christensen, an author and poet, attached herself to the rail around the neck and refused to move.

She said she was a part of protests in the 1980s when land was cleared for Farrington Road near where Roe 8 clearing is taking place today.

"I am hoping to bring attention to the fact that many laws are being broken in this process," she said.

"There is random and malicious destruction going on of 500-year-old trees, ecosystems and sacred sites."

"It's time for upstanding citizens to say no."

It took police 45 minutes to cut her free.

Protest group Rethink The Link said action would continue right up until next months election.

RTL spokeswoman Kim Dravnieks said she had full confidence opposition leader Mark McGowan would follow through with a commitment to scrap the project.