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Shouldn't speed bumps be designed that you move over them at the speed allowed there, e.g. 30 km/h? So theoretically there wouldn't be a slowdown, unless you're already going faster than allowed.

At least I haven't seen speed bumps in 50 km/h roads just to slow people down.

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Should, probably, but it's common in Central Europe that on a 50km/h road, there are 2 speedbumps that can't be safely passed if you're going over 25km/h.

Here in germany, mostly due to tech that allows speed-bump avoidcance, most villages and citys use a sort of slalom that by virtue of physics enforces a speed limit.

Also beloved are narrowings to one lane, where you can not see until you are really close up, wethere somebody from the other side is entering the lane.

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