[euromodder]

Automated enforcement is a mere cash-cow and has little or nothing to do with traffic safety. They generate very high numbers of offences, but hardly generate safety.
The moment revenue goes down, so will the allowed speed.

Based on the numbers I have for local and regional situations, mobile manned speed traps are about 100x times more efficient than fixed-position, automated speed traps.
Anyone wanting increased road safety through enforcement, should push for mobile checks, not fixed camera's.

In the northern part of Belgium, we have about 1400 speed camera's and combined speed/red light camera's - that's one for every 4000 inhabitants.
Portugal has ridiculously few camera's in comparison, but road fatalities there are dropping faster than they do here !
Germany has fewer camera's, but performs far better.

Speed is not the big issue it's claimed to be in road safety.
The EU countries that do better than Belgium, usually happen to effectively allow higher speeds.
Germany does far better, despite the often unrestricted Autobahn and 100 km/h limit on extra-urban roads.
The UK does far better, despite the 96 km/h limit on the often challenging British extra-urban roads. And despite the 0.08 % BAC (most of the EU is down to 0.05 or 0.02 , some down to 0)