The primary purpose of runway end identifier lights, installed at many airfields, is to provide:

A. Rapid identification of the approach end of the runway during reduced visibility.
B. Rapid identification of the primary runway during reduced visibility.
C. A warning of the final 3,000 feet of runway remaining as viewed from the takeoff or approach position.

Runway end identifier lights are primarily used to rapidly identify the approach end of a runway during reduced visibility, as they provide an indication of the runway threshold and alignment for pilots during poor weather conditions or at night.

Explanation:

The primary purpose of runway end identifier lights (REILs) at airfields is to provide a fast and accurate indication of the approach end of a runway, especially during decreased visibility conditions. Option a, 'rapid identification of the approach end of the runway during reduced visibility,' is the correct answer.

These lights are usually a set of two synchronized flashing lights, one on each side of the runway threshold. They facilitate in identifying the threshold and the alignment of the runway, enabling the pilot to establish a safe and accurate approach.

This is vital during poor weather conditions or at night. Thus, the primary objective is not necessarily to identify the primary runway, or to provide a warning of the runway's remaining length, as stated in options b and c.

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