What color do runway threshold lights display in the direction of landing?

Runway threshold lights display a green color in the direction of landing. This is an important visual cue for pilots as they approach the runway to land. The green lights are positioned at the beginning of the runway threshold and serve to indicate the correct path for landing, signaling to pilots that they are aligned with the runway centerline. The use of green lights helps enhance safety during the landing approach, particularly in low visibility conditions, as they are easily distinguishable from other light sources.

In contrast, red lights are typically used to indicate that the area beyond the threshold is not suitable for landing, warning pilots to prepare for a go-around if necessary. White lights may be used for other runway lighting systems but do not indicate the landing direction. Blue lights are generally employed for taxiway edge lighting and do not play a role in the landing process. Understanding these specific functions of runway lights is crucial for effective training and safety management in aviation operations.