Hidden Speed Cameras for Unprotected Villages

Whilst I might have exalted company temporarily looking at my blog may I put forward a proposal.
A new sign for unprotected villages. Saying Hidden Speed Camera Zone. Outlay very small, benefit very large. A team of Arrive Alive to occasionally visit villages who ask for signs and have them, liasing with the Beat manager and the Community.
Motorists will not know if speed cameras are present so they have to do the correct speed all the way through the village.
North Wales Police have neither the funding or the man power to deal with this anti social epidemic.