What does a steady red light from ATC signal for an aircraft on the ground?

• A. Proceed with caution
• B. Stop or do not proceed
• C. Prepare for takeoff
• D. Clear for taxi

Answer: (B)

A steady red light from Air Traffic Control (ATC) indicates that an aircraft on the ground must stop or not proceed. This signal is crucial for maintaining the safety and order of operations at an airport. When a pilot sees a steady red light, it means that there is a potential hazard ahead, either due to other aircraft movements on the runway or taxiway, or because of air traffic control instructions.

The red light serves as a visual warning to ensure that the aircraft does not move forward, thereby preventing accidents or conflicts with other aircraft or vehicles. Understanding this signal is critical for pilots, as such lights are standard methods of communication in the air traffic control environment.