I get what you mean, but it's not quite correct.

For example, one situation I have seen in real life: You are on a road with speed limit 100km/h. There's a bend to the right with bad visibility, and right around the bend is a speed limit 30km/h and a speed camera right next to it. This situation is propbably financially great, but from a safety aspect it's really not.

It would be much better to gradually decrease the speed limit (e.g. 100, 70, 50, 30) over a longer distance and where there's better visibility.

In fact, if placing the signs, placing the radars and collecting the fines are handled by the same department, it's likely that they will purposely create dangerous situations like that to collect more fines.

That's why it should be three separate departments with separate goals:

• One handles placing safe speed limits with the goal to increase safety.
• One handles placing the cameras with the goal to reduce the amount of people going over the speed limits.
• One handles maintaining the cameras and collecting fines.