What color are the thresholds lighted for night landing?

The correct answer is green because green lights are universally used to indicate the approach and landing thresholds at airports. In aviation, the green color signifies the beginning of the runway and is a critical element for pilots during nighttime operations, guiding them to align properly for a safe landing. This color is easily visible in varying weather conditions, contributing to effective navigation and safety.

In contrast, blue lights are typically used for taxiway edges and not for runway thresholds. Red lights are often reserved for indicating runway holds or obstructions. Yellow is commonly associated with caution or advisories but not specifically for landing threshold illumination. Therefore, green is the definitive color for indicating landing thresholds at night, as it enhances visibility and safety for pilots approaching the runway.