Speed bumps are rare in my area save for malls, parking lots, schools, and apartment complexes. I regard them as necessary evils there to keep pedestrians from being mowed down. Speeding is a real and significant problem on many residential streets that goes largely unchecked as well...
Just as an amber light at a cross section means to go faster, the very name “speed” bump clearly indicates that one must gain a modicum of speed in order to navigate their imaginary stock car over it. And, philosophically speaking, it isn’t the straight road which makes us wiser, but how we manage the bumps.
We have them all over in London, yet I don't recall seeing them in the US. We call them Sleeping Policemen.
This 4-Wheeler was a known speed-bump offender, driving over them routinely at the speed limit or higher. In fact, the invincibility of his wheels so dominated what little sense he had left, he tried to cross the Colorado River in them. The river is Federally adjudicated, thus we have U.S. Coast Guard, Bull Head City, Laughlin, Clark and Mohave County Law Officers routinely keeping the river safe for the thousands who enjoy it. Not sure if it matters, but the State Line between Arizona and Nevada runs smack-dab down the center of the river, which kinda explains the jurisdiction "rights", and this fool embarked from the Arizona shoreline and got less than 1/10 of the way across. BHC Fire Department. Frank
Speed bumps or sleeping policemen are very rare in my area. You may find them in some residential areas and they are not high enough. Suppose the function is rather to remind drivers than to really make them slow down.