What color are the fixed, unidirectional runway threshold and wing bar lights?

The correct answer indicates that the fixed, unidirectional runway threshold and wing bar lights are green. This is established by the conventions used in aviation lighting systems, where green lights signify the beginning of the runway, guiding pilots safely during takeoff and landing. These lights are instrumental for pilots as they can clearly identify the runway threshold, especially during low visibility conditions.

Green lights are universally recognized in aviation as indicating a point of interest or direction, which supports the pilot’s situational awareness when approaching the runway. The presence of green lights at the runway threshold fulfills a crucial role in maintaining safety and navigational accuracy. This standardization across airports allows pilots to understand the layout and operational protocol of the runways without confusion, regardless of location.