I know this has happened to you. You're rocking out to a tune in your car, and suddenly are aware that an emergency vehicle is very close. You never heard the siren. Now, a number of police departments are adding a new type siren that can be felt. Kind of like Sir Mix-a-lot booming Baby Got Back from the speakers in the low rider 200 feet behind you.
Implications - This new Rumbler sends a low-frequency sound that is able to shake the ground. The Rumbler was designed to send out ten seconds of shaking at a time, as long as the area is safe. The featured video interviews police officers and drivers who take about what they think of this new traffic control innovation.
Innovation in Traffic Control
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