What colors do threshold lights show at the landing threshold and at the end of the runway, respectively?

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The correct answer indicates that threshold lights display green at the landing threshold and red at the end of the runway. This color coding is vital for pilots as they approach for landing. The green lights signal that the aircraft is aligned with the runway and is approaching the designated landing area, offering reassurance that they are on the correct approach path. Conversely, the red lights at the end of the runway serve as a warning to pilots, indicating that they are nearing the end of the usable runway, which is essential for maintaining situational awareness during landings, especially in low visibility conditions.

Understanding the purpose of these color signals helps pilots in their decision-making process when approaching an airport, enabling them to gauge their position and to ensure they execute landings safely.