There are plenty of legal cases where it is one persons word against another. Thats where the solicitors and barristers aim to discredit the liar and the Judges tend to be pretty astute in working out who is lying. In a case such as this the driver of the car would have all the work to do to prove his innocence as the complianant will be believed pretty quickly, why would someone go to all the bother of reporting someone they don't know and have to endure court etc.
Having said all that this seems more likely a spot by a Policeman rather than another member of public.
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