Except cameras don't increase safety. You say it yourself that everyone just speeds up after the camera.
Getting a ticket also does nothing to prevent you from speeding in the first place (the ticket does not arrive to you instantly, you're still speeding on the road).
Road safety is an infrastructure problem, but it is always easier and cheaper to just put a camera and collect money. While designing roads that you cannot go too fast, and actually building them cost money.
They just want the cheapest option to say "we did something". Not the safest.
One time when I was living in Shanghai, I accidentally took the train to the wrong airport and had to take a cab to the other one. The cabbie was driving on the highway right at the speed limit, and I was worried I wouldn’t make my flight. I asked him if he could rush a bit, but he replied that he would not speed because 100% he would get a ticket.
It only doesn’t work if the system is half assed. But I agree that in low speed pedestrian areas, the built form is a better solution, but knowing you will get caught is also effective (if you accept the privacy tradeoffs).
>You say it yourself that everyone just speeds up after the camera
...because they know where it is and there are so few of them...
Humans are very good at trying to get away with things. The only way to solve speeding is for people to receive the fines, receive the points on their license. They only speed because they're selfish fucks and because it's so easy to get away with it.
Getting a ticket also does nothing to prevent you from speeding in the first place (the ticket does not arrive to you instantly, you're still speeding on the road).
Road safety is an infrastructure problem, but it is always easier and cheaper to just put a camera and collect money. While designing roads that you cannot go too fast, and actually building them cost money.
They just want the cheapest option to say "we did something". Not the safest.