I live in Southern California, and there are no less than 4 intersections on my 7 mile each way commute where a bike lane becomes a right-turn-only lane. I asked a motorcycle cop about this once when he pulled up next to me. According to him, I must obey all the traffic laws as if I were driving a car. If I pull into a right-turn-only lane, I MUST turn right. As a consequence, I pull into the right-most lane that still allows me to go straight, and then pull back into the bike lane by the time I leave the intersection. As I live in a state full of lifted F-350's going 65 on surface streets, pulling out of the bike lane is a harrowing experience to say the least.
-Keith