Henan, a Chinese province on the central plain area, has an expansive network consisting of national-level and provincial level expressways. As of 2017, the province had 6,523 km (4,053 mi) of expressways.^[1] 99 out of the 109 county-level divisions of Henan has expressway connections.

The national-level expressways are numbered with a letter prefix G, which is short for "guojia" in Chinese meaning "national". For provincial-level expressways, a letter prefix S, which is short for "shengji" (province level). The numbering of provincial-level expressways in Henan follows the rules below:^[2]

• For radial expressways leaving Zhengzhou (the province capital), use a number in 81–90. (except for S1)
• For north–south expressways, use an odd number in 11–69. (in ascending order from east to west, except for S83)
• For east–west expressways, use an even number in 10–70. (in ascending order from north to south, except for S81 and S86)
• For connection or branch routes, use a number in 91–99.
• Numbers 2-10 are reserved for radial expressways, and 71-80 are reserved for connection routes.