Whenever special pedestrian-control signals exhibiting the words
"Walk" or "Wait" or "Don't Walk" are in place, such signals shall
indicate as follows:
1. Walk. Pedestrians facing such signal may proceed across the roadway
in the direction of the signal and shall be given the right of way in
the direction of the signal by the drivers of all vehicles.
2. Wait or Don't Walk. No pedestrian shall start to cross the roadway
in the direction of such signal, but any pedestrian who has partially
completed his crossing on the walk signal shall proceed to a sidewalk
or safety island while the wait signal is showing.