Runway threshold lights shall be provided for a runway equipped with runway edge lights, except on a noninstrument or non-precision approach runway where the threshold is displaced and wing bar lights are provided.
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runway threshold light; threshold light: terms usually used in the plural.
When a threshold is at the extremity of a runway, the threshold lights shall be placed in a row at right angles to the runway axis as near to the extremity of the runway as possible and, in any case, not more than 3 m outside the extremity.
