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Runway threshold identification lights are…

  • A
    steady yellow lights.
  • B
    steady white lights.
  • C
    flashing white lights.
  • D
    flashing green lights.

Refer to figure.
ICAO Annex 14
Chapter 5. Visual Aids for Navigation
5.3.8 Runway threshold identification lights

Characteristics
5.3.8.3 Recommendation.— Runway threshold identification lights should be flashing white lights with a flash frequency between 60 and 120 per minute.

5.3.8.4 The lights shall be visible only in the direction of approach to the runway.

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