Police have made dozes of arrests
Isoleer Brittanje, which is demanding government action on home insulation, stopped traffic at two sections of Britain’s busiest motorway.
They targeted Junction 23 for South Mimms in Hertfordshire and the main carriageway from Junction 8 at Reigate to Junction 9 at Leatherhead, both in Surrey.
Demonstrators sat on the road, causing huge queues of traffic.
Videos posted on social media show angry drivers remonstrating with the activists.
Insulate Britain said 89 of its members took part in the action on Wednesday.
The group said in a statement: “We demand credible action now.
“Proper jobs for hundreds of thousands of people to start the first real step – to insulate all the homes of this country – which pound for pound gives us the biggest reduction in carbon emissions.
“It is a total no-brainer and yet this government refuses to get on with the job. This is criminal negligence.”
A demonstration by the same group on Monday saw five junctions of the M25 blocked, leading to tens of thousands of drivers being stuck in huge queues of traffic.”
Dozens of people were arrested.