I recently read in the CA Driver Handbook that a car making a right turn MUST merge with the bike lane before the intersection to make the right turn.
http://www.dmv.ca.gov/pubs/hdbk/pgs22thru25.htm#bike_ln
"When you are making a right turn and are within 200 feet of the corner or other driveway entrance, you must enter the bike lane for the turn. Do not drive in the bike lane at any other time."