Usually not because there are other buses overtaking the one stopped in the lane, or there is something else in the way. Plus there are not bus lanes everywher

Usually not because there are other buses overtaking the one stopped in the lane, or there is something else in the way. Plus there are not bus lanes everywhere. But in theory yeah :-) If we had these in London we could return bus lanes to the rest of the traffic or use it for dedicated cycle-lanes or pedestrian use.