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The inside shape of deceleration device is wedge, square plastic device at its top is to buffer and reduce friction. The shape of deceleration device can give the driver a Psychological hint(though it is soft)that i must slow down and it can't be forced through.
hubei university of technology
wuhan, China
kaiqiang xu weibing deng
hubei university of technology
wuhan, China
pei yang xiaobo jiang jianfeng li jingming huang
