Transportation techniques, facilities, or programs designed to slow the movement of motor vehicles.  Traffic calming typically involves changes in street alignment, installation of barriers and other physical measures to reduce traffic speeds and/or cut-through volumes in the interest of safety, livability, and other public interests.  Physical treatments may include speed tables, raised crosswalks, textured pavement, roundabouts, chicanes, curb extensions, partial roadway closures, diagonal diverters and median barriers.