Function of Colour Light Signals:
1) Two-aspect colour-light signals: In this each signal has two lamps (one above the other). The higher of the two is a green lamp, and the lower one is a red lamp. The green lamp when lit indicates clear (the proceed indication) and when the red lamp lit it is used for STOP indication.
2) Three-aspect colour-light signals: In this, each signal has three lamps arranged vertically. The top one is green, the middle one yellow and the bottom one is red. The green lamp when lit indicates clear (the proceed indication) and when the red lamp lit it is used for STOP indication and the yellow lamp shows the caution indication.
3) Four aspects of colour light signaling: 4th aspect is attention aspect given by 2 yellow lights in vertical fashion interpreted as “prepared to pass next signal at restricted speed”. Signal-1 & 2 located less than braking distance apart.
Signal- 3 shows attention aspect, when signal-2 is at caution. A driver sighting signal-3, must pass signal-2 at restricted speed & stop has to be made at signal-1.
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