My buddy got a ticket on a rental HD in Cali for lane splitting. Apparently it is NOT completely legal. As is was explained to him it is up to the officer if you are doing it in a safe manner or not. They make the decission on the spot if you will be pulled over and issued a summons. The officers reason was that the bike he was on was too large to safely lane share. Rediculous excuse but he still got the ticket.