At a level crossing, a moving half-barrier...
A)only prohibits passage while it is in a transverse position to the roadway; if it is rising, you may continue.
B)requires extreme caution, and you may only cross if no vehicle is approaching.
C)requires you to stop.Correct
Upon reaching a level crossing or a movable bridge that is closed, with the barrier or half-barrier in motion, or when its traffic lights prohibit passage, drivers and users must stop one behind the other in the corresponding lane until they have a clear passage.