TERMIUM Plus®

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FOUR-ASPECT SIGNAL [1 record]

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Record 1 2009-07-16

English

Subject field(s)
  • Signalling (Rail Transport)
  • Railroad Safety
CONT

The most common type of four-aspect signal has four lenses arranged from top to bottom as follows: yellow, green, yellow, red. Modern LED [light-emitting diode] signals with just two lenses can show all four aspects. The lower lens is capable of displaying a red, yellow or green light. Not all lines use four-aspect signalling - three or two aspects are used where the headway and line speed allow.

French

Domaine(s)
  • Signalisation (Transport par rail)
  • Sécurité (Transport par rail)

Spanish

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