Kent Police have confirmed that they were called to a road traffic collision, between junctions 3 and 4 on the coast-bound carriageway of the M2, at 1.40pm this afternoon (Sunday 16th February).
In the accident, which involved four cars altogether, one car landed on its roof in the middle of the carriageway.
A woman, from Camberwell in South East London, who was a passenger in the over-turned vehicle, suffered severe injuries and was taken to a London hospital by the Kent Air Ambulance. Kent Fire and Rescue Service were also in attendance due to fuel leaking from the vehicle.
Both carriageways' traffic was stopped for the air ambulance. The London-bound carriageway was re-opened at 3.30pm and the coast-bound at 4.15pm.
The injured woman is believed to have possible life-changing injuries. The driver of the vehicle was not injured.
The Serious Collision Unit, at Maidstone Police HQ, are appealling for witnesses to contact them on 01622 653430.