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All lanes at junction 3 slip road on to the M25 are closed due to an overturned car.
The incident is believed to have happened at around 8am on the M20 slip road.
Emergency services are at the scene to help recover the vehicle.
Vicki Foster from Kent Police said: "Officers were called at 7.34am on to a report of a collision involving two vehicles at junction 1 of the M20.
"Officers attended along with South East Coast Ambulance Service and injuries, not believed to have been serious, have been reported.
"A rolling road block was put on while the emergency services dealt with the incident and the road was cleared at around 9.55am."