Introduction to Qinhuang Chidao: In 221 BC, Qin Shihuang unified the six countries. In the second year (220 BC), he ordered the construction of Chidao with Xianyang as the center and leading to all parts of the country. Among them, the famous Chidao There are 9. Chidao is the emperor's exclusive lane. The ministers, common people, and even the emperor's relatives have no right to use it.