What does a red light signal from the control tower indicate?

A red light signal from the control tower indicates that the pilot must not land and should continue circling. This is a universal directive used by air traffic control to prevent a landing under specific circumstances, such as when the runway is obstructed or there are other safety concerns that necessitate keeping aircraft in the air rather than allowing them to land.

In this context, the red signal serves as a critical warning, ensuring the safety of both the aircraft and those on the ground. It is essential for pilots to understand and respond to such signals to maintain safe operations around airports. Understanding the significance of light signals from the control tower is fundamental for pilot safety and effective communication with air traffic control.