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

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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.

The clever system assesses the traffic in an area and calculates when drivers need to be warned that an emergency vehicle is coming towards them, before sending the warning.

While the system will only be able to play an alert in cars that have their radios turned on, estimates suggest that the warning will reach two thirds of vehicles on the road.

Currently the system, which was designed by 23-year-old students at the KTH Royal Institute of Technology, is being tested on privately owned ambulances and fire engines operating in Stockholm. However, it is expected to expand across the Scandinavian country later this year.

Cofounder of Evam Systems and industrial engineering student at KTH Royal Institute of Technology, Mikael Erneberg, told the Telegraph: "Often drivers have only a few seconds to react and give way to emergency vehicles.

"The optimal warning time is at least 10 to 15 seconds. We want to catch motorists' attention at an early stage, and mitigate stress that impairs road safety."