Introduce intelligent speed governors that can sense the maximum speed limit in an area.
Introduce it on all new cars over a period of time, and require retrofitting on all old cars at the end of that time.
This gets rid of the need to police for speeding, and the speed cameras can go.
Why does this idea matter?
Suspicion that speed cameras are more about revenue raising than safety results in a number of drivers simply selecting routes that are not provided with cameras. Safety is not necessarily improved as there are still those who speed regardless.
Speed governors would focus on the safety without the suspicion of revenue raising, and would put everyone on an even footing. Dynamic speed limits could be introduced and the relevant technology could even advise cars of the future as to ideal speeds, separation, etc.