Police have made 32 arrests after Insulate Britain activists blocked traffic both ways on a road near the Dartford Crossing and M25.
The climate group first gathered on Crossways Boulevard, Greenhithe, at around 8am, having announced another day of action.
Some of those involved glued themselves to the road surface, or each other, police said.
Officers attended the scene within minutes and by 8.30am traffic was flowing in both directions, arresting 14.
Soon after, police became aware of an additional four people who were suspected to be involved in the wider planning of the disruption.
They were detained in a nearby car park.
At around 9.05am, a further report of traffic being obstructed on a slip road for junction 1a of the M25, anti-clockwise, was received.
Officers attended and detained a further 14 people, some of whom had glued themselves to the road surface.
One lane is now flowing and officers are continuing to engage with several protestors at the scene.
Each of the individuals was arrested on suspicion of obstructing a highway and conspiracy to commit public nuisance.
They remain in custody as enquiries continue.
Motorists are advised to expect delays and to use an alternative route if possible, police said.
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