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- -Climate protesters have brought chaos to the road network this morning.
- -Protesters blocked the M25 roundabout at junction 20 near Kings Langley at around 8am.
- -Drivers stuck in the delays clashed with protesters who are from a campaign group called Insulate Britain.
- -There has been a large police presence and Hertfordshire Constabulary has confirmed 18 people have been arrested in connection with the protest at junction 20.
- -Demonstrators were cleared by 10.20am, police said.
- -Hertfordshire County Council warned of delays, with the A41, A4251, and M25 all affected.
- -Other protests have also taken place across the M25 network with activists sitting in the main carriageway at one location.
- -Follow our live blog below for further information and updates
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