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Drivers were urged to slow down and take care following reports of people walking along a motorway.
It happened on the coast-bound lane of the M20 between J4 A228 (for Leybourne and Snodland) and J5 with the A20 for Aylesford.
The alert was issued by Kent Highways.
It is understood a broken down vehicle is responsible for the danger and authorities said the road cleared at around 12.45pm.