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- Speed measurement is carried out using three or four sub-surface piezo sensors.
- Piezo-electric axle sensors allow speed measurement
in tunnels, underpasses, close to bends and on bridges.
No spurious speed readings possible.
- Piezo sensors are visible in the photograph thus
showing where the photo was taken.
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![[Picture showing the speed measurement system]](i/speedmeasurement.jpg "Typical speed measurement sensors and secondary speed check lines on a road")
