The new signs measure speed in a similar way to hand-held cameras

Research shows speeding is the main cause of accidents and injuries on the island's roads.

The "speed visor" works in a similar way to the hand-held guns police use to measure how fast a car is travelling.

One sign has already been put up on St Aubin's inner road and another in Gorey.

As a car approaches, its speed is displayed - but only if the motorist is breaking the limit.

The signs are moveable and they could be used elsewhere in Jersey if the current campaign proves a success.