Motorcyclists can’t split lanes by repeatedly going over double yellows

Q. Dear Honk: I read your column last week about moving over in the lane in slow traffic on the freeway to let motorcycles pass, which makes sense. My question is whether it is legal for motorcycles to split lanes from the carpool lane to the adjoining lane while crossing over the double-yellow lines? I see this every day when in the carpool lane; this seems very dangerous to the motorcycle riders, and I can’t imagine it is ever legal to cross lanes in this manner.
– Dave Hayes,