A group of French school children on an exchange trip to Britain filmed an Indian-origin man after spotting him driving naked on a road linking Folkestone and Maidstone towns, a media report said.
The Canterbury Crown Court heard that Anand Singh, 37, was driving past the bus carrying the students when he was spotted "abusing" himself in February this year, the Mirror reported on Friday.
Prosecutor Robert de Banzie said Singh, a former prison guard, was completely naked when he drove alongside the bus while abusing himself.
"He pulled alongside the bus before reducing his speed and making eye contact with witnesses on the bus. These included a number of children who proceeded to film him using their phones," he was quoted as saying.
Police got the registration number of his car from photos taken by the French students.
The defence lawyer said Singh had "no appropriate explanation" for his actions, adding that "driving in his own car along a motorway completely naked is hardly sneaky or sophisticated".
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"He was struggling with a number of events in his life including a marital break-up and three bereavements within 12 months," the court was told.
Judge Adele Williams ordered Singh to go on a treatment programme for his problems and was banned from driving for six months.