Speed cameras do work though. Here they are often used in specific places where people are driving too fast, especially if near schools and other places where it’s extra dangerous.

For example close to where I live there is a steep hill with a road that goes straight down and after there is a completely straight road and then a really small bridge with a bump.

Some people like to speed down the hill and basically “jump” the bridge bump. Fortunately a speed camera was installed at the bridge and they warn about it well in advance.

While you could technically redesign the road, it would be very costly compared to a camera and that road is a very small road with low traffic and private farmland (or grazing land, I don’t remember) on both sides.

Here the cameras aren’t even activated all the time just enough to achieve their goal of reducing traffic.