De la enpresa que ha desarrollado el sistema:
"The system comprises a sensor capable of detecting vehicles where there are active 2G, 3G and 4G phone signals, and an LED warning sign located a short distance along the road. As long as the activation meets certain pre-determined parameters, the sensor will pick up that a driver is using a phone for calling, text or data purposes and will activate the warning sign. This shows an illuminated mobile phone icon within a bright red circle and diagonal red line."
https://www.westcotec.co.uk/westcotec-launches-new-mobile-phone-detection-warning-system/
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