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."
More top news
War medals belonging to the late Great Escaper Bernard Jordan will be auctioned for charity.
Simon's Blog - Britain's Animals Have Got Talent
Tuesday night's weather for the east of the region