Duke University’s John Staddon makes the case for less, and more effective, road signage in the U.S – using Durham roads and streets as examples:
ugh, WordPress does not like this format. You can see the video here or here.
From here, which I discovered here because I am fascinated by the science of traffic and driving. If only explaining the mathematical models of traffic flow and the cognitive psychology of driving to the traffic cop could get one out of a ticket….
A Blog Around The Clock 
The bigger problem is communities that use traffic enforcement fines as a revenue generator. Multiple and/or misleading signage becomes a profit center. The same thing goes for red light cameras, where traffic light timing is manipulated to increase revenue at the expense of safety.