I was totally fine with the way I saw speed cameras set up in Sweden, Latvia, Lithuania etc. in those places you generally see them only when you are genuinely passing through a place that it is unsafe to be speeding, most often this is the main crossing point in a small village where one of the only the bus stops is. A totally reasonable place you don’t want people rocketing by at 100 kmh. The key is that in Europe you are almost always warned exactly where, in meters, the speed trap is, often multiple times. So you have ample time to slow down and it’s not a “gotcha” like speed traps you might see in the States or the infamous red light cameras that you would only know they are photo enforced as you are driving through them because the barely visible sign is right before the light.

In short, the key thing about European speed cameras in my experience that makes them reasonable and effective is that they are actually designed and implemented as a way to slow people down, not as a moneymaking agenda

Side note I think Norway has gone just a bit too far with them. Especially in Oslo area