那是因为冬天道路结冰，车辆轮胎抓不住地，容易打滑出事故，所以绑上防滑链！

　　可以增大接触面的粗糙程度来增大摩擦力。铁质防滑链使用范围很广，也是最常见最经典的一种。

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　　由于冬天冰雪道路非常滑，所以车辆的轮子上一般都要按防滑链。所谓的防滑链就是在车轱辘上要几圈儿铁链子。就像你描述的那样，为什么冬天车鼓楼上有铁链子？这个铁链子就是我们所说的铁链子，你房子道路结冰，湿滑造成是交通事故。