designer's own words:Normal zebra line has been used for hundreds years, however, it never changes. Zebra line is a bridge between two sides, it gives passersby information that it will keep them safe. But, it’s not really so safe! The bridge (zebra line) also implies the passersby that you could cross the street every time. It decreases the function of the red/green light. I think the zebra line should be the same with the red/green light; they should change together, turn together. Two kinds of information could make your crossing safer.