It's a heart stopping moment which every motorist dreads – a police officer points a radar gun at your car clocking you over the speed limit.

Drivers found speeding face being fined and having points added to their licence however an increasing number are using hi-tech equipment to evade speed guns.

Officers from Acle Road Policing are warning drivers about the consequences of using laser jamming devices which confuse speed guns.

The electronic gadget works by alerting the driver to laser speed detectors and temporarily prevents it from taking a reading, therefore allowing the driver time to slow down.

The device can be purchased and fitted to a vehicle for around £355 and while it is not illegal to own or install such a device on a vehicle it is an offence to block police speed guns.

Anyone found to be using this device to avoid speeding tickets face getting a criminal record and a fine.

Last night (September 6) traffic officers arrested a sixth driver for using a jamming device after police were unable to get a speed reading from a Mercedes travelling towards Great Yarmouth.

The vehicle was stopped and the 57-year-old driver was arrested on suspicion of perverting the course of justice. He has been released on police bail until October 2.

It is one of five cases currently being pursued by police and follows a successful prosecution in July where a driver was given a six month conditional discharge and fined £85 after he admitted using a laser jammer for obstructing police.

Sgt Geoff Bowers said the devices would not be tolerated on Norfolk’s roads.

He said: “Motorists using these devices clearly have no regard for speed limits and consequently are a danger to themselves and other road users. They are also obstructing police officers in the course of their duty.

I hope the arrests and conviction act as a firm warning to motorists considering using such a device. Drivers using laser jammers face getting a criminal record and having their car seized.”