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A woman has been badly hurt in a motorbike crash that closed a section of the A2 near Bluewater.
Emergency services were called to the London-bound carriageway near Bean at about 12.30pm.
The road was closed for almost three hours while officers from the serious collision investigation unit carried out an investigation.
The Highways Agency said normal traffic conditions were expected by 5.15pm.
Motorists were earlier urged to avoid the area as traffic stretched back to Rochester, with delays of 40 minutes.
A police spokesman said a woman has suffered serious injuries.
The crash is believed to have also involved another motorbike.
The coast-bound carriageway was earlier closed when the air ambulance landed at the scene.
At 2.30pm, the Highways Agency said trapped traffic was being released past the scene in two lanes, but the road remained closed until about 4pm.
Many motorists were left standing on the carriageway as long queues formed.
Vehicles spotted included two vintage Rolls-Royce cars adorned with wedding ribbons.