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First, the lights on the street can change real time by themselves according to the streams of people who are waiting for crossing the road from two sides in order to show the width of the zebra crossing. People now can wait on the street by the lights. What’s more. the lights on the street can be touched by the visually impaired due to the bumps on the street. Then when people can cross the road, the lights beside the street will show the width of the zebra crossing. And it can remind some smart phone addicts of the change of sign lights, too. Finally, when people from two sides cross the road, they won’t collide with each other.