Courts have held public agencies liable for personal injuries resulting from faulty design. Because speed bumps have considerable potential for liability suits, many officials have rejected them as a standard traffic control device on public streets.
In addition, tests of various experimental designs have demonstrated the physical inability of a speed bump to successfully control all types of light-weight and heavy-weight vehicles. The driver of a soft sprung sedan is actually encouraged to increase speed for a better ride over a bump that may cause other motorists to lose control.
The control of speeding in residential neighborhoods is a widespread concern which requires persistent law enforcement efforts ... not speed bumps.