Although the Rumbler, conceived and sold by Federal Signal, has been helping cops grab the attention of citizens for a few months, its shock waves are just now getting the publicity they demand. The setup is being installed on patrol cars in locales such as Washington, D.C., Pennsylvania and New York, and it serves the purpose of moving crowds / vehicles out of the way when an officer is headed to an emergency. More specifically, Rumbler-equipped rides take advantage of the powerful woofers and amplifier to shake the ground beneath them and get people a-lookin’ some 200-feet away. Reportedly, the gizmo is meant to be used “judiciously, in situations where motorists should pull over to make way for the police,” and it can also be helpful in grabbing the eyes of deaf drivers who cannot hear the traditional siren. ‘Course, you could just load up your ride with a few subs and pop in a low-frequency CD to achieve the , but don’t be shocked if your copycatting ways net you an unwanted citation.