Prepare the self-driving route from Lhasa to Nyingchi and Shannan: Lhasa-Basongcuo (Sujieba Village)-Lulang-Yalung Zangbo Grand Canyon (Susong Village)-Jiacha (Sujiacha)-Zedang (Suzedang)-Yanghu - Lhasa. Is the line reasonable? Will the road in Shannan be difficult to drive? Do I need to apply for a border defense permit for this itinerary? Thanks!