Some people do, but you can easily put speed cameras where there are some accidents. It's more honest that way in my opinion. I've driven in Germany and their cameras don't make me go much slower, just annoy:
- A series of 80-60 speed changes on straight road, then just when you are annoyed and don't slow, there is a speed trap.
- Badly marked school zone, I was doing 40km/h already, then a black painted camera hidden in bushes caught me.
We have those in Poland too, that's how I got my first speeding ticket. three lanes each way 80, 80 80, crossing with 60 and camera (there wasn't even any pedestrian crossing there too.
- A series of 80-60 speed changes on straight road, then just when you are annoyed and don't slow, there is a speed trap.
- Badly marked school zone, I was doing 40km/h already, then a black painted camera hidden in bushes caught me.