How far do the touchdown zone lights extend down the runway?

The correct choice reflects the standard regulation that touchdown zone lights extend for a distance of 3,000 feet down the runway from the beginning of the runway. This distance is critical for pilots during landing, as these lights provide visual references and indicate the touchdown zone, helping them gauge their approach and landing accuracy.

Touchdown zone lights are designed to enhance safety and operational efficiency, giving pilots a clear indication of where to aim their landing. The 3,000-foot extension is particularly beneficial for landing aircraft, especially in varying weather conditions, as it allows pilots to see these lights well in advance of landing, ensuring better alignment and glide path control.

In contrast, shorter distances mentioned in other choices would not provide the same level of support for pilots needing clear visual cues for a safe and precise landing.