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This design aims to solve the problem that blind man can't distinguish traffic lights condition when they go across the road, it is bitterly dangereous for them.This electronic blind brick keeps pace with trafic lights.When trafic lights are red ,the projection of brick is Dot-like shape,representing they should wait a moment.When trafic lights are green,the projection of brick is Strip-like shape,representing they could go acros the street now.Makes safe and convenient traffic for the blind.