How sneaky are the police now with mobile speed checks. I once read that they are suppose to display signs so far up the road in each direction. I see them doing it all the time where i live except they don't have any signs up, they hide in the hedges and only stay there for half an hour so they don't get complaints. I think it's ridiculous that they can sneak up us like that. Whats your thoughts and have you been caught like this???