A motorist drove off over Doncaster farmland to avoid capture by an off-duty police officer.
Humberside Police said an off-duty officer started following a Land Rover, which was towing a trailer, along the M18 in the early hours of yesterday.
The Land Rover pulled into the M18 Services at Doncaster and then drove off over farmland.
A spokesman for Humberside Police said: "An off-duty officer was following a suspicious looking Land Rover pulling a trailer when it left the road over farmland at the M18 Services at 12.48am.
"The vehicle has not been located since the incident."
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