The Sichuan Province is adjacent to the Eastern part of Tibet which makes Tibet accessible by road, traversing through the Sichuan-Tibet Highway. This Highway has been divided into two distinct parts, one of which is known as the Southern Route and the other road is known as the Northern Route.
The southern route of Sichuan to Tibet Highway of China belongs to part of G318 National Highway, which spans from Shanghai to Zhangmu. The northern route of Sichuan-Tibet Highway belongs to part of G317, which starts from Chengdu to Nagqu. The southern route has a span of 2149 kilometers, whereas the Northern route which is relatively a little longer than the Southern Route is 2293 kilometers in length. Since the southern route is shorter and the altitude is lower than that of the northern route, most people choose the southern route.
The Sichuan Tibet Highway
The Chengdu-Lhasa Highway, also called Sichuan-Tibet Highway for short, is a modern upgrade of the ancient Sichuan-Tibet Highway. It starts from Chengdu, the capital of Sichuan Province in the east, and ends at Lhasa, the capital of Tibet in the west. It's part of the sections of National Highway 318, 317, 214, and 109. It is the most difficult road in China. Divided into north and south routes. Some connecting lines in the middle of the north-south routes are generally classified as part of the Sichuan-Tibet Highway.
As one of the major roads in and out of Tibet besides Qinghai Tibet Railway, this highway was inaugurated and was made functional on 25th December 1954. This highway is vital to the progress of Eastern Tibet, by promoting the economic development of Eastern Tibet. This road is known to be the best option to reach Tibet if you are coming from Sichuan or any other Southern Chinese Province by the overland route.