Police, Amulance, and Fire Department vehicles now may have a new feature to some; being able to vibrate your car. This new siren system, is very effective because most cars made are now trying to keep very little sound from the outside of your car able to make it's way into it. Often, you might be too distracted by the radio in your car, or somthing els to realize there is a cop, ambulance, or fire truck near you. With the newer siren, police and other important vehicles send off a vibration to your car and a low frequency sound wave. Basically it should make your car vibrate like a bass speaker to catch your attention and alert you to pull over or get out of the way.
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but, i'm not real sure!
I think people need to be responsible when they are driving and being aware of cops/ambulance/fire trucks is a part of your responsibility while driving!