Activists from the protest group Insulate Britain blocked part of the M25 for an eighth day in three weeks, causing long queues of traffic.
At around 08:00 BST on Thursday, supporters glued their hands to the ground at Thurrock Junction 30 in Essex.
According to Essex Police, officers were able to “quickly re-open” one lane, with all lanes re-opening shortly after 10:00 a.m.
Nine people were arrested and are being held in custody on suspicion of obstructing a highway.
“We understand this will be frustrating for people using the road,” police said, “but we appreciate your patience and understanding.”
Insulate Britain, which is urging the government to insulate all UK homes by 2030 in order to reduce carbon emissions, issued the following statement: “We’re picking up the pace this week because, despite the gravity of the situation, the government has yet to respond meaningfully to our demands.
“We are deeply concerned that rising fuel prices and insufficient insulation action will result in additional unnecessary suffering and deaths among the most vulnerable this winter.
“Failure to assist hardworking families, failure to prevent poverty-related deaths, failure to protect the country we love from the greatest threat it has ever faced.”
The organisation also stated that its actions were “in violation of a High Court injunction” obtained by the government last week.
Because of the injunction, anyone who blocks the M25 may be found in contempt of court, which carries a maximum penalty of two years in prison or an unlimited fine.
On Wednesday, Transport Secretary Grant Shapps stated that “reckless protesters” have “already had knocks on their doors.”
“We are serving papers,” he continued, “and those who continue these idiotic, dangerous, and counterproductive demonstrations will be apprehended and face unlimited fines or prison.”
Insulate Britain reported that several activists had been contacted at home regarding the injunction.