I often see such a sign on the roadside: it is forbidden to destroy military facilities. What military facilities are there along the expressway?

Military optical cables and military communication systems are different from our civilian ones. He wants to ensure that the signals in the army are smooth and not affected by the outside world. In addition, the transmission of signals by civil systems is likely to leak, so he must have his own communication lines. For example, the launch of Shenzhou VI was based on their own military route.

The military line is regularly patrolled by his own patrol personnel.