I suggest you take a bus to Lanzhou. The intersection of Yongdeng Longquan Temple is OK, but there are still dozens of kilometers from the airport to the intersection. There are generally no cars on this section. If you take a taxi to the intersection, it's hard to say whether you can take a long-distance bus with a seat, and it's too painful to wait in the open air in ice and snow. Therefore, it is safer to take a bus from Lanzhou departure station.