The eastbound carriage of the A20 near the Sidcup Bypass has now been opened following the earlier incident.
However, one lane has remained closed as well as the westbound carriage. Drivers are advised to consider alternative routes.
An air ambulance was called to deal with a serious, multi-vehicle crash on the A20 Westbound easlier this morning.
Traffic had been backed up from the Sidcup Bypass to the Swanley Interchange as the A20 Eastbound has been closed off to help assist the situation.
A spokeswoman from Air Ambulance Kent Surrey Sussex said that a team was dispatched at 11:15am and are currently working on the scene
Police and the ambulance services have been contacted for more information.
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