welcome to the boards Prod...
first off I'm not a LEO, but I've been following the legality of this here and in other states when I can.
It's "not illegal" to lane share in California.
To my understanding that is the definition of the law. It's way COOL, and it's also way TOOL for officer unfriendly to put the bite on you.
Cool is, yes, you can legally lane share, all you have to do is move inbetween the cars and bingo! your lane sharing!
Tool is, "You were operating your vehicle in an unsafe manner" Hello JUDGEMENT call. Officer unfriendly can write you this ticket while your parked at Burger King and you'd have absolutely ZERO way of proving it. Better hope for a friendly judge on ANY judgement call tickets.
Tool is, "you didnt signal before lane change" so yah... uhmmm you really should but can you hit that stupid little button that quick? AND... IF YOU DO... how much risk are you adding to your daily commute by concentrating on a button instead of traffic and cars and objects in the road and pedestrians and aliens from mars and what the hell else ever is going on...
Cool is... quite honestly... he's got to catch you to write you a ticket. if he's 10 or 15 cars back in 2 or 3 lanes of traffic... please tell me exactly WTF he is gonna do to you, whether you live in Cali where lane sharing is legal or in any state where it isnt.
The downside to that philosophy is that you are willing to run, lots of guys are, no problem, I make no judgement here... just be willing accept you are dead, you are quad paralyzed when you crash, the 7 year old in the soccer mom's mini van is quad paralyzed for life after your bike hits them, or johnny law is now dead, dying, or hurt after only trying to do his job to chase you.
back to the question at hand. we dont LANE SPLIT in california, we LANE SHARE and it's not illegal even for 2 cars, a little known factoid. The rest of the laws that apply to traffic can still affect you! It is almost 99% judgement call on the officer.
My personal suggestion is, Lane share and be a ninja sword through butter 24/7... fuck'em if they cant take a joke. When you get pulled over, if you decide to stop, get a very good attorney and fight the ticket since it's based on discretion and judgement call you already have grounds of dispute. It's quite different from being radar clocked at 65 in a 25 school zone. If you decide not to stop, you should be willing to injure or kill any innocent civilian in your way. I'm not, so I dont.. I know lots of people who dont feel the same way. Up to you...