Swedish drivers will be forced to hear ambulance sirens thanks to radio-jamming technology

Emergency vehicles in Sweden have been fitted with radio jamming devices to ensure that their sirens are heard by nearby motorists.

The new warning device, known as the Evam System, is able to override radio and media devices in vehicles using a FM radio signal. This signal will jam a car's speakers, halting the radio and instead play a voice alert announcing that an ambulance or fire engine is approaching.