Around 29 protestors were arrested on Monday morning after a planned shut down of the London orbital at 7am.
At Junction 18 at Rickmansworth an enraged driver told the activists: "Why the hell do you think this is the right thing to do?
"I know what you’re fighting, I completely agree, this is a really, really good idea, but this is not the way to do it.
"You’re causing more pollution with all these cars sitting here just doing f*** all. You’re wrecking lives and you’re making people hate you.
“Go and protest London, go down to Downing Street."
“You’re stopping someone from getting to hospital… why the hell do you think this is the right thing to do?”
Furious motorists clash with eco-mob Insulate Britain who have blocked access to the M25 again.
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Another furious motorist was filmed being held back by police as he swore at the protesters.
Police moved to break up the activists who had glued to themselves to the road pouring blue paint as part of their campaign to improve home insulation.
Police have now cleared Insulate Britain protesters and reopened roads on the M25 and A1(M).
Hertfordshire Police confirmed the M25 near Chorleywood and the carriageway near junction four of the A1(M) at Stanborough have opened after being blocked for several hours.
Chief Superintendent Nick Caveney said officers were on the scene “within minutes” and the protesters were now in custody.
He said: “Protesters have made it clear that they intend to continue causing disruption. Not only is purposely blocking a highway incredibly dangerous, it also affects thousands of members of the public who are stuck in delays as a result.
“We have robust plans in place in order to minimise any disruption and to allow us to make arrests as quickly as we possibly can. This includes, but is not limited to, monitoring areas that have been identified as possible protest targets.
“I understand and appreciate the frustration regarding the considerable delays and inconvenience that has occurred as a result of the protests.
“We have now made a total of 76 arrests in relation to protest activity across Hertfordshire over the last week.”
A statement from the protest group said: “Early this morning, Insulate Britain blocked the M25 for a fourth time.
“Actions will continue until the Government makes a meaningful commitment to insulate all of Britain’s 29 million leaky homes by 2030, and all social housing by 2025.
“Many of those blocking the roads today have participated in all four actions to date.”
The group wrote to National Highways and the police on Sunday to urge for speed limits to be reduced and to alert them to the action on Monday.