MUTCD DESCRIBES A "NORMAL WALK SPEED OF 1.2 METERS (4.0 FEET) PER SECOND" FOR USE IN TIMING THE PEDESTRIAN CLEARANCE PHASE AT A TRAFFIC SIGNAL. THERE ALSO IS AN UNSPECIFIED SUGGESTION TO USE SLOWER SPEEDS WHEN SLOWER PEDESTRIANS "ROUTINELY" USE A CROSSWALK. THIS FEATURE PROPOSES THAT THE CLEARANCE ...