Qinshihuang said about unifying his domain by reorganizing his government into commanderies, directly responsible to his central government, standardizing the written language and the system of weights and measures including even the width of carriage tracts.

秦始皇为了一自己的国家而将自己的政改组为由中央一管辖的郡县，并规范了文字和度量衡，至包括马车的宽度（书同文、车同轨）。