Operate the runway edge lights between sunrise and sunset when surface visibility is less than ___ mile(s).

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Multiple Choice

Operate the runway edge lights between sunrise and sunset when surface visibility is less than ___ mile(s).

Explanation:
Edge lights in daylight are used to help pilots see the boundaries of a runway when visibility is reduced. The standard rule is to operate these lights between sunrise and sunset when surface visibility is less than three miles. This level of visibility is where the lights make a meaningful difference in perceiving the runway edges, especially in hazy or foggy conditions. So the best filled value is three miles. If a source lists a smaller threshold, keep in mind that three miles is the widely accepted guideline for daylight operation of runway edge lights.

Edge lights in daylight are used to help pilots see the boundaries of a runway when visibility is reduced. The standard rule is to operate these lights between sunrise and sunset when surface visibility is less than three miles. This level of visibility is where the lights make a meaningful difference in perceiving the runway edges, especially in hazy or foggy conditions. So the best filled value is three miles. If a source lists a smaller threshold, keep in mind that three miles is the widely accepted guideline for daylight operation of runway edge lights.

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