The Sichuan-Tibet line north line is 2,412 kilometers long, the highest point along the way is 5050 meters above sea level, the bird mountain; South line total length of 2,146 kilometers, passing through the altitude of 4,014 meters of Litang. North and south between the two lines have changdu to bangda highway (169 kilometers) connected, this part belongs to the small north line. The south line is shorter and lower in elevation than the north line, so the Sichuan-Tibet highway into Tibet is more south line. Along the Sichuan-Tibet Highway into Tibet, into Tibet on the way from east to west in turn over 14 elevation of more than 4,000 meters of high mountains, across the Dadu River, Jinsha River, Nujiang River, Lancang River and other turbulent rivers, the road is difficult and dangerous, but the way the scenery is magnificent, with snow-covered mountains, primeval forests, grasslands, glaciers, canyons and large rivers and big rivers.
The Sichuan-Tibet National Highway 318 is famous for its danger, and is the main highway transportation channel from Tibet to the southwest provinces and cities. But during the rainy season, the 102 landslide cluster and the Tongmai-105 Daoban section of National Highway 318 are muddy and prone to natural disasters.
The Sichuan-Tibet route has only a few months of good roads in a year. The best time of year to travel in and out of Tibet along the Sichuan-Tibet route is May and mid-August-October. between May and August is the rainy season in the west, and the Sichuan-Tibet route is often cut off and rerouted due to frequent mudslides and landslides, which are fraught with many hazards, and require courage and determination to hike through the landslide zones.