Originally Posted by
degnaw
Strictly legally, I would say the motorist is at fault. In reality, however, I would never count on drivers to check for bikes in a way that isn't an afterthought while looking for cars.
I myself as a conscientious cyclist, IMO, have opened car doors after looking and had cyclists zip past me. When riding I keep this thought in mind; treat every parked car like a gun and assume it is loaded, with an occupant ready to exit.