What is the signal for an aircraft to taxi?

• A. A steady red light from ground control
• B. A light gun signal with a steady green light
• C. A flashing blue light from the tower
• D. Written instruction on a clipboard

Answer: (B)

The signal for an aircraft to taxi is indicated by a light gun signal with a steady green light. In air traffic control operations, a steady green light is universally understood as the signal for an aircraft to proceed. This visual cue allows pilots to communicate and interpret instructions quickly and clearly, especially in situations where radio communication may not be possible or audible. The steady green light effectively directs the aircraft to move safely on the taxiway.

Other signals, such as a steady red light from ground control, generally indicate to the aircraft to stop, while flashing signals are typically used for different instructions, like clearances for takeoff or landing. Written instructions may not be practical for immediate actions needed on the runway or taxiways, as they do not provide the immediate feedback that visual signals offer in dynamic airport environments.