Do a traffic study at several city intersections. Record the time allotted for pedestrians who cross by the “walk” cycle of the traffic light. Also measure the curb-to-curb distance at the crosswalk. Look up the range of the adult human gait, and determine what fraction of the adult population will have insufficient time to cross. For the purpose of this exercise, do not consider individuals walking with canes or riding in wheelchairs.
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