What is the tunnel 355km and 470m away from Yin Fu Expressway?

The tunnels 355km and 470m away from Yin Fu Expressway are Shangcun Tunnel. Shangcun Tunnel is a key and difficult control project of Dehui Expressway, with a total length of 329 meters on the left and 29 1 meter on the right. The geological conditions of tunnels are complex, and the construction quality and safety are challenging and difficult. In order to meet these challenges, the project department has taken various measures, such as perfecting the "five systems" such as access control system, video monitoring system, personnel positioning system, emergency telephone system and gas detection system. Fuzhou-Yinchuan Expressway, referred to as "Yin Fu Expressway" for short, is an expressway connecting Fuzhou City, Fujian Province, China and Yinchuan City, Ningxia Hui Autonomous Region, and it is 14 in the east-west route of China National Expressway Network. Yin Fu Expressway was completed on February 22, 201KLOC-0/65438. Fuzhou-Yinchuan national expressway is 14 of the east-west horizontal line of the national expressway network, and it is a traffic artery connecting the east with the west and running through the north and south.