There is a movement afoot in Idaho to adopt a "three foot law" on behalf of cyclists. (In essence, the cyclist gets a 3-foot force field - the safety-zone that motorists can't encroach upon, when passing, etc.) Currently, the law states that it has to be a "reasonable" distance... but apparently some people's "reasonable" isn't very reasonable to others, particularly the cyclists who are out there being put in harm's way.
I could support that legislation, I s'pose. There are similar laws in numerous other states, including recently in Utah.
BUT... when current laws-on-the-books aren't being enforced, it makes me wonder if there's value in putting yet another law on the books.
Here's another interesting legal development...
Columbia, Missouri, just passed a law that prohibits "verbal and physical harassment by aggressive motorists." Story HERE.
Frankly, it's hard to believe that we need a specific law that says you can't throw stuff at cyclists. (Wouldn't that be assault and/or battery?) But maybe that's where we're headed.
I don't know if I'm just lucky... but since 1986 I believe I've had stuff thrown at me two times (and nothing "dangerous" ever). I get honked at, I'd say, 3 or 4 times a year, almost always by little blue-haired ladies or punks... both groups have marginal driving skills, so maybe it's a good thing that they honk. (Maybe if you're always getting stuff thrown at you, or are getting screamed at or honked at regularly... you should take a look at your bike-riding techniques. Just sayin'...)