G8513 Pingliang–Mianyang Expressway
The G8513 Pingliang–Mianyang Expressway, commonly referred to as the Pingmian Expressway, is an expressway in China that connects the cities of Pingliang, Gansu and Mianyang, Sichuan.
The Pingliang–Tianshui section includes the Guangshan tunnel through the Liupan Mountains.