The control of speeding in residential neighborhoods, while maintaining acceptably safe street and roadway conditions, is a widespread concern that requires persistent law enforcement effort. The inability of posted speed limit signs to curb the intentional violator leads to frequent demands for the installation of "speed bumps". However, actual tests of various experimental designs have shown the physical inability of a speed bump to control all types of lightweight and heavyweight vehicles successfully. In fact, a soft sprung sedan is encouraged to increase speed for better ride, while some vehicles may lose control. Increased hazards to the unwary, challenges to daredevils, disruption of the movement of both emergency and service vehicles and undesirable increases in noise have caused speed bumps to be officially rejected as a standard traffic control device on public streets.