>>>Not only in Britain but in Romania too:)
>>
>>But surely they've got radar-based BAT'S eyes in Romania!? :-)
>
>There's a habit in most of the ex-Yu countries to hang a CD on the rear-view mirror (officially called "retrovizor" - one of the official names that stuck in the regular language, amazingly) because it will, presumably, confuse the police radar and you won't get caught speeding.
>
>Someone tried to investigate the origins of this legend, and found that Germans use to do that too. So the guy (a Gastarbeiter in Germany) asked his German neighbor, assuming the Germans must be more tech-savvy, why does he do it. And the neighbor said "well, we saw you Yugos do it, and you guys know all the tricks".

This was on MythBusters, and they proved it did work.