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Bizarre footage appears to capture a naked man imitating having sex with a blow-up doll on the end of a slip road on the M1 .
The footage, taken on a lorry's dashcam , shows the man standing behind the doll near Northampton last Wednesday morning.
He appears to be balancing it against a crash barrier and has it facing away from him.
The driver, who wants to remain anonymous, said: "Some people have very strange hobbies and fetishes."
The clip has amused many social media users and has been shared widely.