The operator stayed on the phone with the man to reassure him until a patrol located his car - and drove the vehicle through the tunnel with him as a passenger, before sending him on his way. He was too scared to drive through the Dartford crossing.
Inspector Paul Sellwood, of the Kent Police roads policing unit, said: "This incident shows how seriously we take all calls we receive from members of the public."
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Wiltshire Police are warning parents and children of stranger danger following reports of children being approached by strangers in cars.
Wednesday morning's weather for the west of the region
Wednesday morning's weather for the east of the region