G75 Blue Ocean Expressway Lanzhou-Haikou Highway, referred to as Blue Ocean Expressway for short, China National Expressway Network number is G75, which starts from Lanzhou, passes Guangyuan, Nanchong, Chongqing, Zunyi, Guiyang, Majiang, Duyun, Hechi, Nanning, Beihai, Zhanjiang and Hai 'an, and ends in Haikou, of which Zhanjiang-Haikou section and G 15 Shenhai Expressway double track are 250 in length. It is the main channel from the southwest of China to the south China coast.