China Naming Network - Ziwei knowledge - What does the number 3 18 mean?

What does the number 3 18 mean?

The number 3 18 represents the Shanghai-Nyalam highway. No.3 18 is National Highway 3 18, which is one of the horizontal lines of Shanghai-Nyalam Highway, China Ordinary Highway and China National Highway Network. The number is G3 18, so the number 3 18 stands for Shanghai-Nyalam Highway.