What color are runway threshold lights?

Runway threshold lights are specifically designed to indicate the beginning of a runway, and they are colored green. This color is significant as it provides pilots with a clear visual reference for landing and takeoff. The green lights located at the runway threshold help to visually distinguish the runway from the surrounding area, indicating a safe environment for aircraft operations.

The other colors, such as red, blue, and white, are used for other purposes in aviation lighting but do not serve to signify the runway threshold itself. Red lights typically indicate the ends of a runway or obstructions. Blue lights are commonly used for taxiway edge markings, and white lights are utilized for runway centerlines and other runway surface lighting. Thus, the specific use of green lights at the runway threshold provides crucial information and assists in safe flight operations.