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The road has now reopened after a four-car crash near Blue Bell Hill earlier today.
The collision happened between Taddington and Lord Lees Roundabout in Chatham just before 2pm.
The London bound slip road for the M2 was also closed at the time.
A police spokesman said: "Patrols are currently at the scene of a collision involving four cars at the Lord Lees roundabout near Blue Bell Hill.
"Police was called to the incident at 1.47pm and officers attended along with South East Coast Ambulance Service and Kent Fire and Rescue Service.
"At around 3.20pm the slip road form the M2 was reopened though there continues to be congestion in the area while arrangements are made to recover the vehicles.
"Motorists should consider alternative routes while emergency services are dealing with the incident."
A Kent Fire and Rescue Service spokesman confirmed they were also at the scene.
They said: "Three fire engines attended alongside SECAmb and Kent Police, and crews used hydraulic cutting equipment to rescue one person, who was trapped inside a vehicle. They were passed into the care of paramedics."
SECAmb also confirmed they were called at around 1.50pm.
A spokesman said: "Ambulance crews attended the scene and three patients were assessed and treated before being taken to Medway Maritime Hospital."
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