Pedestrian control signals exhibiting the words "WALK" or "DON'T WALK" indicate as follows:
1) "WALK": Pedestrians facing the signal may proceed across the roadway in the direction of the signal and must be given the right-of-way by the drivers of all vehicles.
2 "DON'T WALK": A pedestrian may not start to cross the roadway in the direction of the signal, but any pedestrian who has partially completed his crossing on the walk signal may proceed to a sidewalk or safety island while the "DON"T WALK" signal is showing.