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Because of urban transportation planning,there are some roads can only ride bicycle on the overpass.However,the foot bridge is not very friendly to the bicycle.It's hard to ride a bicycle up and down the hill,especially for kids or the elder.Many people would rather to take the risk of riding on the motor way,and don’t want to ride the bicycle to the overpass,which caused a lot of traffic accidents.This kind of the elevator uses the power to extend a motive power on the other side. The person who is riding bicycle can put the bicycle on the handrail and go up the hill easily.It eliminates the trouble of lifting the bicycle on the overpass.