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The A20 has been blocked by an accident.
Eastbound traffic on London Road in Allington is very slow following the crash near Maidstone Park and Ride.
Fire engines were called after a car ended up on its roof.
A spokeswoman from Kent Fire and Rescue Service said: "The car was on it's roof but a woman inside was able to free herself.
"Two fire engines were sent to the scene".
Crews were called to the crash at 11.45am and left shortly after midday.
A spokesman from Kent Police said: "We were called at 11.48am on Thursday regarding a collision involving two cars on London Road at its junction with Beaver Road.
"Officers, Kent Fire and Rescue Service and the South East Coast Ambulance Service are currently at the scene where one of the cars has overturned."
The woman's injuries are not thought to be life threatening.