A homemade motorcycle stopped on the M25 was described by a traffic officer as the "most unusual vehicle" he had apprehended in 26 years.
It was spotted just before junction 21 for the M1 in Hertfordshire at about 20:30 BST on Sunday.
The officer tweeted that it was "all checked and in order" but he was "not convinced" he knew what it was.
A police spokeswoman said the vehicle was approved and registered by the DVLA.
Another roads policing officer called the vehicle a "homemade electric motorcycle" which was "made from bits of balsa wood and duct tape".

ID'd from his feet to be Cedric Lynch >

