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There is queuing traffic on the London-bound carriageway of the A2 following an earlier accident.
Police say they were called at 2.49pm today to a three-vehicle collision near Pepperhill, Dartford, and the A296 junction.
No serious injuries were reported, but officers remain at the scene, which is near the turn-off for Bluewater, while the incident is attended to.
The crash initially closed one lane causing congestion back to the Gravesend/Tollgate Services.
All lanes have no re-opened, but National Highways said there is still three miles of congestion and a 20-minute delay.