Protesters are blocking a roundabout near the Dartford Crossing and part of the A40 in west London.
It’s the latest action by the Insulate Britain group, who’ve also blocked roads in central London and the M25 in recent weeks.
Protesters were blocking traffic near Gypsy Corner on the A40 in North Acton on Wednesday morning, the AA said, with cameras showing people sitting in the road and queuing traffic.
Another demonstration was taking place near the Dartford Crossing, at the A206 Crossways Boulevard.
It comes as Insulate Britain asked drivers to avoid the M25 or reduce their speed to 20mph, declaring that from Wednesday it will become “a site of nonviolent civil resistance to stop our government committing crimes against humanity”.
The group confirmed on its website that its members were behind this morning’s disruption and said it was the fifteenth time it had blocked roads in the last six weeks.