What is the full form of HIRL?

The full form of HIRL is High Intensity Runway Lights. This terminology is essential in airport operations and understanding airfield lighting systems. HIRLs are critical for providing visibility and safety for aircraft during takeoff and landing, especially in low-light conditions or adverse weather. These lights are designed to be bright and visible from a significant distance, helping pilots navigate safely along the runway.

In contrast, the other options do not accurately reflect the established terminology used in aviation. High Intensity Radiance Lights, High Intensity Relaying Lights, and High Interference Runway Lights are not recognized terms within the context of airport lighting and operations. Recognizing the correct full form is vital for effective communication in aviation and helps in understanding the related regulations and guidelines that inform the operation of runways.