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Fire crews were called out to Blue Bell Hill on Thursday afternoon after a vehicle caught alight.
Traffic built on the Chatham-bound carriageway as Kent Fire and Rescue Service dealt with the blaze.
Crews were called to the scene at 1.17pm, and one lane was closed to enable emergency services to deal with the incident.
The fire was out by 1.31pm.
Traffic has now returned to normal in the area.