Runway edge lights are white, except on instrument runways, where yellow replaces white on the last two thousand feet or half the runway length, whichever is less, to form a caution zone for landings.

Runway edge lights are vital for aviation safety. Typically white, these lights switch to yellow for the last 2000 feet or half the length on instrument runways, marking a caution zone for pilots.

Explanation:

The operation of runway edge lights is a critical aspect of aviation safety. These lights, which line the edges of airport runways, aid in the safe landing and takeoff of aircraft, especially during periods of low visibility such as nighttime or poor weather conditions. Most of the time, these lights are white to provide high contrast against the background. However, on instrument runways, which are used when the pilot primarily relies on instruments for navigation, these lights are yellow for the last 2000 feet, or half the length of the runway, whichever is less. This creates a caution zone, alerting pilots that they are nearing the end of the runway and must prepare for landing or take other necessary actions.

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