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A series of red flashes from aerodrome control directed towards an aircraft on the ground means..
  • A
    give way to other aircraft that are taxiing.
  • B
    taxi clear of the landing area in use.
  • C
    slow down taxi speed.
  • D
    the aircraft is on the wrong taxiway and must stop and taxi back.

Refer to figure.
ICAO Annex 2
Appendix 1 - 4. SIGNALS FOR AERODROME TRAFFIC

4.1 Light and pyrotechnic signals

From Aerodrome Control to Aircraft on the ground

  • Steady green - Cleared for take-off
  • Steady red - Stop
  • Series of green flashes - Cleared to taxi
  • Series of red flashes - Taxi clear of landing area in use
  • Series of white flashes - Return to starting point on the aerodrome

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