Chaos struck the M25 for a sixth time after Insulate Britain blocked traffic again, with police dragging protestors off the motorway.
Campaigners from the climate change group sat in front of traffic on Junction 14 of the London ring road by Heathrow Airport.
Police confirmed one lane of traffic was reopened and that arrests had been made.
The Metropolitan Police tweeted: “We’re attending a protest at Junction 14 of the #M25 near Heathrow Airport where activists are blocking traffic on a slip road.
“We are on scene and have opened one lane of the carriageway. Arrests are being made – we will share updates shortly.”
Insulate Britain spokesperson Liam Norton said earlier: “You can throw as many injunctions at us as you like, raid our savings and confiscate our property, but we are going nowhere.
“This country is going to hell unless you take emergency action to stop putting carbon into the air.”
Officers swarmed to the scene to rid the road of the sit-in protestors just after 7am, footage shared by TalkRADIO showed.
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