What does a steady red light directed at an aircraft on the ground indicate?

• A. Proceed
• B. Stop
• C. Hold Short
• D. Taxi

Answer: (B)

Visual ground signals use color and steadiness to tell pilots exactly what to do while taxiing. A steady red light aimed at an aircraft on the ground means stop immediately—you must not move until you’re given further instructions or a signal to proceed. This stops traffic to prevent collisions, especially around intersections and active runways.

If you see a green signal, that indicates you may proceed as cleared, and a flashing signal communicates a different instruction (such as a change in how you should move). So the steady red is the clear indicator to halt and wait.