While the laws in
California are
vague on the matter of lane splitting - Ha! That's an
understatement - until recently, there have been absolutely no references to the act in the
California Vehicle Code - there is now a reference.
CVC Section 21714(b)(2) described the act of lane splitting while explaing that it is explicitly prohibited for certain kinds of vehicles. Motorcycles are not included in that class. Interestingly, neither are traditional cars.
So, now we've got lane splitting on the books, and it's not to outlaw it for motorcycles!