Rule 846 — Mounting of Signals

1. (a)Signals displayed for protection of track work and track conditions must provide an unobstructed view of them as seen by the crew of an approaching movement. They will be of the prescribed colour, size and shape.
2. (b)When a day signal cannot be plainly seen, each flag must be reflectorized or equipped with a reflectorized lens, target or disc, or a reflectorized sign may be used instead. In the application of Rule 841, the required light must be displayed.
3. (c)Red, yellow, and yellow over red flags may display those colours only in the direction of an affected approaching movement. Green flags must display that colour in both directions.

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