M25 junctions blocked by Insulate Britain campaigners
Police make more than 40 arrests at a series of co-ordinated protests around the motorway.
www.bbc.co.uk
Climate change protesters blocked five M25 junctions, causing long tailbacks and disruption for motorists.
There were protests at junctions 20 for Kings Langley, Herts, 14 for Heathrow terminal four, three for Swanley in Kent, six for Godstone, Surrey and 31 for Lakeside, Essex.
They have since been reopened but police said 42 people were arrested.
Protest group Insulate Britain tweeted it was "disrupting the M25" to "demand the government insulate Britain".
A government spokeswoman condemned the protests and said it was supporting people to install energy efficiency measures in their homes.
Hertfordshire Police said 18 people were arrested after officers were called to a protest near junction 20 at about 08:00 BST.
Supt Adam Willmot said: "Protesters ignored police requests to move location, so we took robust action to enable roads to be reopened and to remove the protesters causing obstructions."
The force closed the slip roads in both directions, which led to "congestion and delays on both the M25 and the A41", but the closures had lifted by 10:20 BST.
image captionThe group said action would go on until a "meaningful commitment" was made by the government
image captionA government spokeswoman said "resulting traffic delays will only add to vehicle emissions"
Essex Police said 12 people were arrested after it was called to reports that a number of people were blocking the road near junction 31 just before 08:15 BST.
It said officers worked to resolve the situation "quickly and safely", which included shutting the slip road temporarily.
Ch Insp Paul Austin said the action caused "significant disruption" and thanked drivers for their "patience and understanding."
image captionPolice made more than 40 arrests at the protests
image captionTraffic backed up near the exit for Heathrow
Kent Police has confirmed that 12 people were arrested at junction three where the B2173 and the M25 meet, near Swanley.
It said it was called at 08:10 BST to a group of people obstructing the roundabout.
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And these pricks wonder why climate activist murder rates are going up!