I live on another street and have experienced the same problems as the original poster. My sympathies - I can totally relate!
I've tried all the same methods and taken all the same actions. The Sheriff's department can only so much. Their hands are tied. We've also considered placing our house on the market since the homeowner does not care about surrounding neighbors.
I was really hoping that the HOA would address this issue at the meeting and make amendments to the covenants, as discussed in earlier posts.
Until these issues directly affect the current HOA board members, this will continue. It's really a shame that a few bad neighbors can spoil it for everyone. My prediction is that this annoying behavior will ultimately result in depreciating home values in our neighborhood. I'm sure none of us want that!