The thing with sound is that it doesn't travel in a straight line. It radiates out from its source, bounces and echos off things etc.
So how will they be able to prove that the vehicle in the picture is making the noise, and the source is not some kid screaming its head off just out of shot?
Ok, they say they've tested it, but then again back in the '80s they "proved" that leg protectors on motorcycles were the best thing since sliced bread. It turned out they only worked if a Honda Cub hit a Morris Minor at a certain angle and speed, but they were very nearly made mandatory
So I reckon a decent lawyer will be able to get anyone caught by this 'snare' off. IMO
And wasting $112,500 of public money on a folly might well get people unelected
