Check this article out... a driver was flashing his lights to warn other drivers of police with a speed gun and got fined:http://www.bbc.co.uk/news/uk-england-humber-12115179
The law states that police should be clearly visible to all motorists, at all times (even when watching out for motorists who are speeding or driving dangerously) so in reality 'speed traps' are a contradiction to that law.
Despite the above a 64 year old man gets fined £175 (plus £250 court costs) for doing so.
What say you? Approve or disapprove?