机车辆在行驶途中都会产生不同程度的震动，特别是大货车、手扶拖拉机等，在乡村公路上行驶时震动犹其厉害。时间久了或遇到频率超过100次／秒的剧烈震动时，驾驶员的神经系统便可能产生障碍。有的会感到手脚疲劳、握力下降、反应迟钝；有的则感到肌肉麻木、骨质松动；甚至有人 Vehicles on the road will produce varying degrees of vibration, especially large trucks, walking tractors, etc., in the rural road when the vibration is still powerful. Over time, or in the face of violent vibration of more than 100 beats / second, the driver’s nervous system may have trouble. Some people may feel tired hands and feet, grip decreased, unresponsive; some feel muscle numbness, loose bone; and even some people