Federal Signal Rumbler Intersection Clearing System

Popular Mechanics calls the Rumbler Intersection Clearing System an "Ear-Splitting Road Clearer".

The Rumbler system introduces a revolutionary new concept to audible warning. This system provides secondary, low frequency duplicate tones that enable vehicle operators and nearby pedestrians to feel sound waves, and perhaps even see their effects through a shaking rearview mirror. The results? Improved emergency response and safer communities. A complete intersection-clearing system consists of an amplifier, a timer, two subwoofers and vehicle specific mounting hardware. This system is then paired with emergency siren. The Federal Signal Rumbler intersection-clearing system is deployed in more than 200 communities and in evaluation in another 100.