Portable Speed Radar
Portable Radar speed signs - also known as driver feed back signs, speedcheck signs, radar speed displays and "Your Speed" signs among other terms - work by refocusing driver attention on their current speed. The "portable" configurations typically consist of trailer, dolly, vehicle truck mount or ground/pedestal mount.
Studies show that well-designed radar speed signs are highly effective at slowing cars - particularly around school zones, neighbourhood streets and work zones.