An Army bomb squad was scrambled and a motorway closed after police carried out a “tactical stop” on a driver.
Officers attempted to stop the driver on the coastbound M20 in Kent, near to junction 12.
The motorist failed to stop and left the motorway before returning to the London-bound carriageway, forcing police to take action to halt the car.
A Kent Police spokesman said: “It was pursued to junction 9 where a police car made tactical contact with the vehicle, bringing it to a stop with no injuries reported.
“The motorway has been closed to allow for the carriageway to be made safe for road users, who are advised to find alternative routes if possible.
“The British Army’s Explosive Ordnance Disposal team is also currently at the scene as a precautionary measure, following concerns about the security of the subject vehicle.”
Shortly before 7pm Kent Police announced that the road had been reopened.
“The M20 is now in the process of being reopened after a vehicle stopped following an earlier incident was declared safe by explosives experts from the British Army and removed from the carriageway,” the force tweeted.
“Thank you for your patience and understanding.”
The incident caused big delays for those on the road.
James Diggle was about ten cars back from the road block at 3.30pm, having been stuck for three hours at that point, Kent Live reported.
He said police were trying to get cars to reverse the wrong way along the carriageway.
A 27-year-old man from Wales was arrested on suspicion of dangerous driving and failing to stop for police.