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Six police cars rushed to the M20 this afternoon and stopped a vehicle they believed to be suspicious.
Officers on motorbikes created a rolling roadblock on the London-bound carriageway, between junctions 7 for Maidstone and Detling and 5 for Aylesford, just before 4.30pm so their colleagues could stop the vehicle.
A police spokesman said: "Officers from Kent Police stopped a vehicle, which was believed to be suspicious, on the M20 at 4.28pm on Sunday.
"Prior to stopping the vehicle, a rolling roadblock was enforced to ensure public safety.
"Officers are currently at the scene and inquiries are ongoing."
Vehicles were released from the rolling roadblock after just a few minutes.
Traffic on the opposite carriageway continued to flow normally.