Emergency Vehicle indicator

A warning signal fromemergency vehicles that are approaching. This would let us know that they are near and to pull over or stay through a green light to let the cop car or firetruckpass by. Sometimes you can't hear the sirens when the music is up too loudly.
Curran F 12/11/2013
Emergency vehicles are being equipped to send out a frequency that can be picked up by radar detectors and future radios. The goal is to silence car radios like an emergency broadcast on your tv when going code 3 nearby.
steve c 08/17/2013
They do have one two infact they are called eyes and ears.....and the third one.....thumbs to turn the stereo down.