"Sweden's Ambulances Can Block Your Radio Signal"
Three students from KTH Royal Institute of Technology in Sweden have invented a program that jams FM radio waves in civilian vehicles and warns them of an approaching ambulance or firetruck.
According to Evam System, the device will also block the use of auxiliary cords and Bluetooth. So the vast majority of time in which a car’s speakers are on, an approaching emergency vehicle is able to deliver a warning. However, rather than just cutting out music, the device also gives voice alerts stating an emergency vehicle is approaching.