Does 'S' Stand for Provincial Highway?

[LaDamian]

s stands for provincial highway. Relevant introductions are as follows: Rules for road numbering: In China, roads are mainly divided into three levels according to their administrative grades: national highways (including national trunk highways), provincial highways, and county highways. The first letters of the Chinese pinyin for the words 'national', 'provincial', and 'county'—G, S, and X—are used as their respective identifiers, with the identifiers followed by numbers to form the numbering. Numbering of provincial highways: The numbering of provincial highways is compiled within the scope of provincial administrative regions; the numbering of provincial radial highways is also compiled within the scope of provincial administrative regions. Radial lines (starting with 1), vertical lines (starting with 2), horizontal lines (starting with 3), vertical connecting lines (starting with 4), horizontal connecting lines (starting with 5), and ring lines (starting with 6).