An 89-year-old man on a mobility scooter took "the wrong turning" and began travelling along a motorway near Kent, police said.
Members of the public called police after seeing the pensioner drive along the hard shoulder of the M20 at Cheriton, near Folkestone.
A Kent Police spokeswoman said: "Kent Police received reports that a mobility scooter was travelling on the hard shoulder of the M20 on the London-bound carriageway.
"An 89-year-old local man had taken the wrong turning and had travelled by mistake on to the M20."
The man, who was not hurt in the incident on Tuesday afternoon, was escorted home by police with his scooter.
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