“Missouri’s Department of Transportation is preparing to deploy the LRAD sound cannon  that’s been used to break up mass gatherings like Occupy Wall Street to warn motorists that they’re going too fast. The device emits a targeted, deafening siren that ‘easily penetrates the windshield and well-insulated cab of a car, even overriding the vehicle’s engine sounds and a radio turned up loud enough to jam to tunes at highway speeds.’  Missouri has committed to the technology by purchasing two of the pricey devices.  LRAD’s sirens can reach up to 153 decibels, more than enough to potentially cause hearing damage. This is technology that’s been deployed in war zones, after all.”

http://www.theverge.com/2014/4/14/5613782/missouri-will-fire-lrad-sound-cannons-to-deter-work-zone-speeding

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