Comment: It's a directed acoustical

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In reply to comment: And those working in the work zones (see in situ)

It's a directed acoustical

It's a directed acoustical weapon. It sends a "beam" of sound in a single vector, able to hit specific targets, even at long distances. It is NOT a speaker which sends sound in all direction. So, if the LRAD is placed in front of the work zone pointed at oncoming traffic, no workers will be able to hear it.