What are the names of all exits of Qinghai g6 Expressway?

Qinghai has four entrances along the way: Lanzhou North, Zhangjiasi, Machangyuan and Ledu. According to relevant public information, the G6 Lanzhou-Xining section of Beijing-Tibet Expressway is the only highway connecting Lanzhou, the capital of Gansu, and Xining, the capital of Qinghai, with four exits: Lanzhou North, Zhangjiasi, Machangyuan and Ledu. Expressway, referred to as expressway for short, refers to the expressway dedicated to high-speed driving of automobiles. Expressway has different regulations in different countries and regions, different times and different scientific research and academic fields.