The Lanzhou–Haikou Expressway, commonly referred to as the Lanhai Expressway is an expressway that connects the cities of Lanzhou, Gansu, China, and Haikou, Hainan. When fully complete, it will be 2,570 km (1,600 mi) in length. It is one of the most important routes between Northwest China and the Southwest, and considered one of the developmental axes of Development of Western China.
