Speed cameras might be important in some places such as school zones. But if their purpose is safety, make them permanent in those places, don’t hide them. Mark them well so that drivers will ALWAYS slow down for them.
Is there any data that shows that the number of accidents decrease where there are speed cameras? It seems as if the state’s purpose in using speed cameras is to make money from them. Playing games and changing the camera positions to maximize revenue from the cameras does not make people safe. The cameras are purposely hidden behind trees and placed at the bottom of hills where speed might be temporally higher, or placed just before a sign which increases the speed limit so the driver might be accelerating to the higher speed. I do not believe this fiddling with signs increases safety but is just to confuse drivers and to make more money for the state. In fact many drivers spotting a speed camera slam on their breaks actually causing a traffic hazard.
In addition to all these issues, we need to audit the cameras to check for their accuracy.