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We have observed that current blind sidewalks exist a few questions. Blind people can not see anything, they have no sense of direction, and they do not know whether they are in reverse. So it is likely to cause something dangerous. We attach language on the blind sidewalks. Transform the convex lines to inclined lines. Then blind people will feel their direction by their feet when they step on the blind sidewalks. It can surely reduce some accident.
He Huang Wenhua Gong Qi Zhou