New road signs can detect mobile phon...

New road signs can detect mobile phones are being used in vehicles

Road signs that know when a mobile phone is being used in a moving vehicle are being installed in Norfolk, in a bid to tackle usage behind the wheel. The system, which can tell the difference between active phone calls and other activities based on the strength of a signal and how long it lasts, flashes up a red warning signal to drivers when it detects a call.

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