What color are the lights used to indicate the end of a runway?

The lights used to indicate the end of a runway are red. This color serves an essential function in aviation safety by providing a clear visual cue to pilots that they are approaching the end of the runway. Red lights are typically positioned at the threshold of the runway and are part of a system designed to delineate the area of safe operation. When pilots see these lights, they understand that they are nearing the termination point of the runway, which helps prevent overruns and enhances overall situational awareness during landing or takeoff.

While white lights are commonly used along the sides of runways and for other aspects of airport lighting, they do not indicate the end of the runway. Yellow lights may be used for various purposes, including taxiway markings, and green lights are often used to denote the beginning of a runway or departure end, but red is specifically designated for runway end indication.