Rule 403 — Appearance of Colour Light Signals

1. (a) Block and interlocking signal aspects will be displayed by the colour, position, flashing of lights, or combinations thereof.
2. (b) The indications of any such signal may be qualified or modified by an attached arrow and/or plate(s).
3. (c) Lights may be attached to either side of the signal mast and number plates may be provided for the purpose of identifying the location.

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