ACTUS REUS OF OFFENCE

Where an individual gave a warning to motorists of the presence of a police speed trap, it was necessary for the prosecution to prove that those warned were either exceeding the legal speed limit or were likely to do so at the location of the speed trap for the individual to commit an offence of obstructing a police constable in the execution of his duty.

[2005] EWHC 2333 (Admin)