Designed as small speed humps, speed cushions compel residential vehicles to reduce their speed in order to drive over them. Emergency response vehicles can straddle the cushions.
Speed tables are raised traffic calming devices that are 3 inches high and flat-topped. This design facilitates a smoother ride and can therefore be driven over at a higher speed than speed humps.
Speed humps are raised traffic calming devices placed across the road to slow traffic. Speed humps are the most popular physical traffic calming measure in the United States today.