It is four kilometers away from zero kilometers, so it is called four kilometers.

During the Anti-Japanese War, Sichuan-Guizhou Highway 1935 started at Haitangxi Station on the south bank of Chongqing, with a distance of zero kilometers, which was the "Skyscraper Twin Towers" of Sheraton. "Zero kilometer" is located along the Yangtze River, which is matched with the ferry terminal and has convenient land and water transportation. This ferry terminal is the famous livelihood terminal.

This road extends two kilometers to Luojiaba Grain Station, three kilometers to Luojiaba and four kilometers to Chongqing Education College.

There are five kilometers, six kilometers, seven kilometers and so on, all the way to Guiyang. Only some place names are not called xx kilometers.