The construction of 040 1 project plays a vital role in Beijing's combat readiness. It's a national highway now.
040 1 The national defense highway project crosses Yanshan Mountain, Taihang Mountain and Wutai Mountain, nine mountains such as Xifeng Mountain, Songshuling Mountain and Tuhuling Mountain, and five rivers such as Yongding River, Dashi River and Juma River. Where the mountain road passes, the terrain is complex, the mountains are steep, the canyons are criss-crossed, and some sections are sparsely populated, lacking water and food, and there is no access. In addition, the combat readiness project follows the principle of "safety, smoothness and concealment", and most routes take the shady side of the hillside, which is not easy to be destroyed by enemy bombing. The earthwork excavation of subgrade is very large, and the project is very arduous. * * Earthwork117500 m3, masonry slope protection 503,000 m3, 5 tunnels with a total length of 954 meters, 69 large and medium-sized bridges, * * 44 17 linear meters, and small bridges and culverts 1792 with a length of * * 692.