I think the challenge would be to come up with the definition of "siren"- or "car horn"-sound. While some are obvious, there are a ton of songs that feature air horns, sirens or other light disturbing noises. Would it have to match a spectrogram of siren noises to be illegal? Does the decibel gauge the legality?

I think there is a ton that's going to fall within the gray area, and it will ensue a lot of lawsuits.

Not that I disagree that it should be illegal, but I think the law would be complicated to define.