Ok, update: I ask a CHP motocop yesterday. Very nice guy. Told me the same thing: only OK with 2 lanes. Every CHP will pull over anyone doing lane sharing on one lane road. They think it's too dangerous because, with one lane drivers don't know on which side you can come. with 2 lanes, they're exepcting you in the middle.
Not very smart IMHO, but at least it makes some sense.
So, be cautious. 2 or more lanes: OK, one lane: ticket.
Oh, and BTW: you'll loose in court: cop will say "it was dangerous in his opinion". Period. You're dead.
![Angry](http://ducatimonsterforum.org/Smileys/classic/angry.gif)