Road signs that can detect when a mobile phone is being used in a moving vehicle are being installed in Norfolk

The system, which is being installed in a bid to crack down on mobile phone usage behind the wheel, can tell when an active phone call is being made and flash up a red warning signal to drivers when it detects a call.

It is able to detect bluetooth signals so that anyone who is legally using hands-free calling will not be wrongly issued a warning.

The technology cannot log number plates or be used to catch offenders yet, but these advancements are being considered for the future and it is hoped the current system will act as a deterrent.

It is the first system of its kind to be used on roads in the UK and was developed by warning sign specialists Westcotec along with Norfolk County Council’s road safety team