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A man in his 60s was cut free by firefighters after a car crashed into the central reservation on the M2.
Emergency crews were called to the coastbound carriageway between J2 and J3 near the Medway bridge at 10.15am.
The casualty was assessed by paramedics before fire crews cut away the site of the vehicle to free him.
Three of the four lanes were closed while the crash was dealt with causing significant delays for drivers.
The motorway re-opened around 11.30am.
Police spokesman Andy Saunders said: "Police were called at 10.15am to reports a vehicle had collided with the central reservation on the coastbound M2, close to junction 2.
"Officers and ambulance crews are in attendance and lane closures are currently in place."
The crash has happened on the same day the motorway is closed London bound from J7 Brenley Corner to J5 Sittingbourne / Maidstone for roadworks with a 69 mile diversion route in place.
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