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Block guide is a roadblock design,when it stop persons it will also guide them to the right way.When accident or service happen,there will be roadblocks to stop you to another way,but we don`t know where should we lead to.According to the clever way of changing the arrows` derection, Cars or passerby will easily find the right direction.
Bingzhi/Zhu Zhang/Cheng Ling`en/Wang Qichong/Wei