FAA Ground School Practice Test

What does an alternating red and green light signal from the control tower communicate to an aircraft in flight?

1. Cleared for takeoff

2. Immediate landing clearance

3. Proceed with extreme caution

4. Leave the airspace

The correct answer is: Proceed with extreme caution

An alternating red and green light signal from the control tower communicates to an aircraft in flight to "proceed with extreme caution." This specific signal is used to alert pilots that all may not be well regarding air traffic or that there might be hazards they need to be mindful of. It serves as a warning while still allowing for some limited action, advising pilots to proceed carefully while being prepared to respond to any additional instructions or changes in weather or air traffic situations. This signal is crucial for maintaining situational awareness and enhancing safety, particularly when pilots may be operating in an environment where visual cues are limited or when status changes quickly. Understanding this signal is a vital component of pilot training, emphasizing the need for awareness and readiness to adjust to evolving situations in the airspace.