What is indicated by the color red in an airport lighting system?

In an airport lighting system, the color red is used to indicate an obstacle warning. This is crucial for ensuring the safety of aircraft during takeoff, landing, and taxiing phases. Red lights typically signify that there is a potential hazard in the approach or flight path, alerting pilots to exercise caution and be aware of their surroundings.

The use of red for obstacle warnings helps to minimize the risk of collisions with structures or terrain, especially in low visibility conditions. Pilots are trained to recognize these signals and adjust their actions accordingly, ensuring that they maintain safe operational practices while navigating the airport environment.