Principle of operation
Two piezo-electric strips are embedded in the road; two such strips at a known distance apart
will detect your wheels over them. The pressure impressed on the strips will result to a
proportional voltage. This voltages act as the signals that will be processed by the
microprocessor. The time it takes between the two strips gives the speed. (Speed equals
distance divided by time).A microprocessor records the time taken by the vehicle between the
two strips and calculates the speed of the vehicle.The camera takes a photograph if the vehicle
is over speeding. A simple illustration is as shown below
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