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An exit slip road was closed on the M25 near Swanley while the air ambulance responded to an accident.
It landed near Wested Lane and there was a full closure of the exit at Junction 3 due to a collision involving two cars.
Watch as the ambulance lands near Wested Lane
Kent Police was called just after 11.50am by paramedics from South East Coast Ambulance Trust and attended alongside Traffic Officers.
A person was taken to a local hospital but the extent of their injuries is unknown.
Traffic was queuing to Junction 4 for Orpington before the road reopened at around 2pm.