Speed humps

Speed humps, cushions, and tables discourage drivers from speeding. Speed humps are raised asphalt bumps that extend across the street. Speed cushions resemble speed humps with added wheel cutouts to allow large vehicles, like buses or emergency vehicles, to pass through unaffected. Speed humps and cushions are usually spaced 200-300 feet apart.

Street characteristics, such as width, determine the type of device we use. We usually install speed humps on non-arterial or residential streets, and reserve speed cushions for busier streets with larger vehicles. 

How does SDOT decide where to install speed humps, cushions, or tables?

• SDOT installs speed humps and speed cushions on neighborhood greenways and streets around schools.
• The Neighborhood Traffic Calming Program prioritizes locations for speed humps, traffic circles, and other traffic calming devices throughout the city each year.
• The Arterial Traffic Calming Program prioritizes the highest severity crash locations for speed cushions and other traffic calming devices.