Apparently the threat of a costly ticket isnt enough to slow down drivers passing through work zones on Missouris highways, so the state is taking extreme measures to solve the dilemma. Missouris Department of Transportation is preparing to deploy the LRAD sound cannon — a tool (some might say weapon) thats been used to break up mass gatherings like Occupy Wall Street — to warn motorists that theyre going too fast. The state has already conducted tests with LRAD (embedded below), loading it onto the back of a truck and sending out verbal slow vehicles ahead warnings to nearby vehicles. But now Missouri has committed to the technology by purchasing two of the pricey devices.