What color do runway edge lights show?

Runway edge lights are designed to provide clear visual guidance to pilots during takeoff and landing, particularly at night or in low visibility conditions. The correct answer is that these lights display white color. This consistent color helps in delineating the edges of the runway, allowing pilots to distinguish the runway boundaries from surrounding areas.

Green lights indicate the start of the runway from the approach direction, while red lights are typically used to delineate the edges of taxiways. Yellow lights are not standard for runways; they are commonly utilized in other areas such as taxiway edges or to indicate warning areas.

Thus, the use of white for runway edge lights is critical for maintaining safety and functionality in aviation operations, ensuring that pilots can clearly see the limits of the runway during landing and takeoff phases.