S312

S312 is a road designation used within the provincial-scale road networks of the People's Republic of China. The letter “S” denotes provincial roads (shengdao), and the number 312 is an identifier assigned within a province’s own numbering system. Because each province administers its own S-series, S312 in one province is not the same physical route as S312 in another province; they share only the numerical designation.

In practice, S312 routes function as regional connectors. They typically link county seats, towns, or junctions with larger national or provincial highways, and they traverse a mix of rural, urban, and peri-urban areas. Maintenance and upgrades are performed by the respective provincial Departments of Transportation, with conditions and priorities varying by section and over time.

The exact length, course, and endpoints of an S312 road depend on the province. Some provinces may designate long trunk segments with historical significance, while others may have shorter stretches that were added or renumbered through upgrades or reclassification. Because the system is decentralized, precise information about a specific S312 route requires consulting province-specific maps or official transportation resources.

See also: S-numbered provincial highways; provincial road networks in China; list of national and provincial highways.