I’m glad the local council installed speed bumps on my local road. They do slow down the knob ends a bit, what else would have worked ?
Largely down to how and where they’re placed. My old place had them scattered all over the village, all it did was make normal non-speeders suffer and invite more speeding because the gaps between were places to make up time – lethal. What works is visible policing, it doesn’t annoy the non-speeders and it slows down/stops the speeders.
Besides most speed bumps are actually more comfortably driven if you go over at 35 mph rather than crawling over them.
Depends on your car and the bump I guess – the full-width ones at my old place would rip your axles off if you hit them at 35. There’s plenty round here you can pass over at 30 without even realising they’re there.