Protesters climbed onto an M25 gantry to bring rush hour traffic to a standstill for the second day running.
Police swarmed the scene after a Just Stop Oil activist climbed up the gantry at junction 31 at the Dartford River Crossing just after 7am, and they were arrested around an hour-and-a-half later.
The northbound gantry is at Junction 31 and is the first as you travel into Essex from Kent.