Light signals are installed with their signal plates and lamps positioned perpendicular (normal) to the track. Depending on field conditions, the signal plate with its lamp assembly may be rotated to an appropriate angle to ensure optimal visibility and alignment with the line of sight of the train driver. The signal lamp itself is designed for multidirectional adjustment, allowing precise orientation of the light beam for proper signal routing.
Main signals are used to provide essential instructions, prohibitions, or permissions for the movement of trains.
The minimum visibility range of a main signal depends on the maximum permitted train speed on the railway line. For a line speed of 160 km/h, the required minimum visibility distance is 500 meters.
The signal post, including its foundation, must be structurally stable and capable of withstanding wind speeds of up to 150 km/h without any permanent displacement or deformation.
