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Airport operationsQuestion 214 of 934

A pilot sees an alternating red and green light from the tower. What does it mean?

  1. Exercise extreme caution
  2. Cleared for takeoff or to land
  3. Stop at once
  4. Return to the starting point
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Correct answer: Exercise extreme caution

Alternating red and green means exercise extreme caution, for aircraft in flight and on the ground.

Source: Aeronautical Information Manual (FAA, Basic with Change 3, 9 July 2026), AIM 4-3-13 Traffic Control Light Signals (TBL 4-3-1), page 257

Practice airport operations

Questions last reviewed: 18 October 2026