(a) Whenever special pedestrian-control signals exhibiting the symbols or words 'Walk' or 'Don't Walk' are in place the signals shall indicate as follows:

(i) Flashing or steady walk: Any pedestrian facing the signal may proceed across the roadway in the direction of the signal and every driver of a vehicle shall yield the right-of-way to him;

(ii) Flashing or steady don't walk: No pedestrian shall start to cross the roadway in the direction of the signal, but any pedestrian who has partially completed his crossing on the walk signal shall proceed to a sidewalk or safety island while the don't walk signal is showing.