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The visually-impaired people usually use cane, guide brick to confirm those obstacles on their path.
But there are more and more public posters and traffic signs being ㄇ-shaped, hurt the visually-impaired people because they are not able to predict the height of those ㄇ-shaped structure.
Cars' Adaptive Cruise Control inspired this product, people would use the radar sensor to know the road condition.
It can keep the safe distance between the visually impaired and those obstacles.