It doesn't monitor data connections though, so won't actually set the warning signs off if you're simply checking notifications or your phone's using a rare bit of 4G to update 53 apps you never use, and it won't shame drivers by capturing their number plates either - it only illuminates the no-mobiles roadside sign.
The new system will be used to identify mobile phone use from within a vehicle.
The system is able to simultaneously detect bluetooth signals so that anyone legally in a call via their car's speakers is not wrongly issued a warning. "We are delighted to have been able to partner with Westcotec to trial the new technology across Norfolk".
The UK is testing out a new system that will detect whether or not a mobile phone is being used in your vehicle and it will flash a sign at you.
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.
More signs are deployed to other towns across the country from next month.
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This scheme is a good example of how we can work with local authorities to make using a mobile phone whilst driving as socially unacceptable as drink or drug-driving.
Norfolk County Council's Road Safety team have developed the technology in partnership with vehicle sign technology company Westcotec.
Iain Temperton, team manager for road safety at the county council, described the technology as "cutting-edge" and said it would be used an "educational tool" throughout Norfolk to tackle the problem.
Using a mobile phone at the wheel now carries a punishment of six penalty points and a £200 fine, which was increased from three penalty points and a £100 fine past year.
"Any scheme which prevents this kind of behavior is welcomed".
If the signal detected indicates that a mobile phone is being used inside a vehicle, a road sign with a flashing visual message is activated as the vehicle passes to prompt drivers to stop using their phones.