I'm going to have to side with Rob on this as the dude in the video doing the lane splitting says, "...don't quote me on this but I don't think there's is a law that states you can lane split but there's also no law that says you cant. Which is basically what Rob was saying too. As long drivers in California are ok with it than why make a big fuss over it unlike here.
Same goes with Florida's helmet law which I think it's illegal to not wear one but if the general populace don't raise a hell storm over it than that's why they allow people to not wear helmet. But here people are so worried about other people's behaviour, what they wear, how they drive/ride, etc.. If they think long term it's actually more a benefit to them as they get to work faster and more people will get into 2 wheel riding easing the road congestion as well.
[video=youtube;c2WgLYenN2A]http://www.youtube.com/watch?v=c2WgLYenN2A[/video]
Not that I think Wikipedia should ever be cited as a critical source, however the entry on lane splitting does reference a book by Pat Hahn.
The legal confusion in Australia is not exceptional. In California no law explicitly and clearly prohibits lane splitting, and significantly, it has become the traditional policy of law enforcement, the courts, and the public in California to tolerate it when it is done safely. However, those engaged in unsafe behavior, including unsafe lane splitting, can still be cited for violating certain sections of the vehicle code.[SUP][57][/SUP] Motorcycle safety author and consultant Pat Hahn wrote in his 50-state handbook of US motorcycling laws that, "Lane sharing with vehicles other than motorcycles is not legal anywhere, including California. However, it is tolerated in California to large degree" and that "California is the only state in the country that allows lane splitting, lane sharing, and filtering. However, contrary to legend, it is not legal. Nor is it illegal. It falls in a gray area unique to California … You can (and will) get stopped and cited if you're riding like an ***."[SUP][58][/SUP] California has no laws explicitly prohibiting lane splitting, and is the only U.S. state for which official statements state that lane splitting, when done safely, is legal.[SUP][59][/SUP][SUP][60][/SUP] California is not the only state for which there is no traffic law that explicitly prohibits lane splitting,[SUP][37][/SUP][SUP][39][/SUP][SUP][61][/SUP][SUP][62][/SUP] but officials rely on other laws to regularly interpret lane splitting as unlawful.[SUP][61][/SUP] For example, New Mexico does not address lane splitting by name, but has language requiring turn signals be used continuously for at least 100 ft (30 m) before changing lanes,[SUP][63][/SUP] as well as other codes which may be cited by an officer.[SUP][57][/SUP][SUP][64][/SUP] Many other states have identical codes, derived from the Uniform Vehicle Code.[SUP][65][/SUP]