Police have arrested 35 Insulate Britain protesters in two locations including another junction on the M25.
Essex Police said it detained 16 people after officers were called to a slip road at junction 31 for Thurrock, near the Dartford Crossing, just after 08:25 BST.
It was then called to reports of people blocking Stonehouse Lane, Purfleet, where 19 people were arrested.
The force said all the affected roads had been reopened.
It has thanked the public for its "patience and understanding", a spokesman said.
The M25 slip road blockage forced multiple vehicles including HGVs to stop and turn round, causing clashes between protesters and angry motorists.
It is the 13th day of protests by the group in the past five weeks.
Insulate Britain said about 40 people were at junction 31 and at the nearby A1090 London Road, near the Dartford Crossing.
The protest group, which has been regularly blocking highways since 13 September, has been calling for the installation of heat-saving measures in social housing by 2025, and all homes by 2030.
It has admitted its latest action is "in breach" of an injunction obtained by the government last month.
A spokesman, Liam Norton, said: "In 10 years' time when fuel crises are catastrophic, when the food has run out and when people are experiencing unsurvivable heatwaves, what would you be wishing you had done now?"
The government has said it was investing £1.3bn to support people to install energy efficiency measures.
On Thursday, 35 protesters were arrested after blocking Old Street roundabout in central London and junction 25 of the London orbital motorway at Waltham Cross in Hertfordshire.
On 5 October, drivers clashed with protesters at the entrance to the Blackwall Tunnel, which goes under the Thames to the east of the Isle of Dogs, and 38 people were arrested.
Essex Police said it detained 16 people after officers were called to a slip road at junction 31 for Thurrock, near the Dartford Crossing, just after 08:25 BST.
It was then called to reports of people blocking Stonehouse Lane, Purfleet, where 19 people were arrested.
The force said all the affected roads had been reopened.
It has thanked the public for its "patience and understanding", a spokesman said.
The M25 slip road blockage forced multiple vehicles including HGVs to stop and turn round, causing clashes between protesters and angry motorists.
It is the 13th day of protests by the group in the past five weeks.
Insulate Britain said about 40 people were at junction 31 and at the nearby A1090 London Road, near the Dartford Crossing.
The protest group, which has been regularly blocking highways since 13 September, has been calling for the installation of heat-saving measures in social housing by 2025, and all homes by 2030.
It has admitted its latest action is "in breach" of an injunction obtained by the government last month.
A spokesman, Liam Norton, said: "In 10 years' time when fuel crises are catastrophic, when the food has run out and when people are experiencing unsurvivable heatwaves, what would you be wishing you had done now?"
The government has said it was investing £1.3bn to support people to install energy efficiency measures.
On Thursday, 35 protesters were arrested after blocking Old Street roundabout in central London and junction 25 of the London orbital motorway at Waltham Cross in Hertfordshire.
On 5 October, drivers clashed with protesters at the entrance to the Blackwall Tunnel, which goes under the Thames to the east of the Isle of Dogs, and 38 people were arrested.
Insulate Britain: Angry motorists confront M25 protesters
Police arrest more campaigners as Insulate Britain mounts its 13th day of road protests.
www.bbc.co.uk
