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Piezoelectric sensors transform mechanical energy into electrical energy to collect data.

The sensor positioned in a groove carved into the road's surface when counting vehicles.

An automobile driving over a piezoelectric sensor squeezes it, causing an electric potential - a voltage signal, has a company for piezo sensors.

The degree of deformation is related to the size of the movement.

The voltage will reverse when the car turned off.

Vehicles can be detected and counted using this voltage change.

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