What is the use of green lights in airport lighting?

Green lights are used at airports primarily to indicate the approach ends of runways. This lighting helps pilots easily identify the start of the runway from a distance, particularly during landing approaches, thereby enhancing situational awareness and ensuring safe landings. The visual cue provided by these lights plays a critical role in guiding aircraft safely to the ground, especially under low visibility conditions or nighttime operations.

In the context of airport operations, other lighting colors and types serve different specific purposes, such as marking taxiways, emergency exits, or hazards, but the distinct use of green lights to denote runway approach ends is a critical element of aviation safety protocols.