Broken of the subgrade

To facilitate high -altitude binding along the highway at a distance of not more than 1 km, as well as in artificial structures in embankments in embankments with a height of more than 5 m, referens are installed. In a plain monotonous area, the reperri are installed after 2 km. Brarevy marks are checked by double leveling. Buildings, protrusions of a cliff or specially dug pillars are used as reperns. The whereabouts and features of the re -reaches are recorded in a special journal.