The Doppler Radar Detection System has been designed to detect approaching vehicles only. It can detect vehicles moving at speeds as slow as 2.5 mph. The Doppler Radar Detector mounts directly to SQ model portable traffic signal systems and is easily adjusted to maximize the detection zone. It is equipped with an LED indicator to provide visual confirmation of detection. The Doppler Radar Detector has a rugged housing and an operating temperature range of -40° to 158°.