Climate change activists, including a rural firefighter, have disrupted peak hour traffic in Sydney by parking a truck on the Cahill Expressway on the Sydney Harbour Bridge.
It comes as activist group Fireproof Australia follow through on its vow to continue demonstrating, despite increased police powers.
New South Wales Police confirmed a police operation was underway on the Sydney Harbour Bridge on Wednesday and urged drivers to avoid the area.
The protesters blocked lanes on the Cahill Expressway near the south pylon, over Circular Quay and The Rocks.
The group of four blocked traffic by parking a truck in the left lane, with two people climbing on the cabin, while another two glued themselves to the bridge, a spokeswoman for Fireproof Australia told AAP.