Watchman speed cameras are similar to the popular Gatso cameras in that they emit radar signal to detect speeding vehicles. How they differ is that they have two types of camera built in, one is used to take an overview of the road ahead, the other to record the number plates of offending vehicles (Number Plate Recognition System).
Watchman emits a constant stream of radar and speed is calculated as a vehicle passes through the beam and triggers a camera if the vehicle is speeding. As Watchman has ‘rear facing eyes’ slowing down as you approach the camera will not save you licence as your speed will have already been recorded unlike traditional ‘Gatso Style Zones’
Don’t get caught out by speed cameras, purchase a Snooper Speed trap Detector.