Which type of lighting is used for runways with precision instrument approaches?

High Intensity Lights (HIRL) are specifically designed for runways that accommodate precision instrument approaches. These lights provide a significantly higher level of illumination compared to medium and low intensity lights, which is crucial for guiding pilots accurately during the final stages of approach and landing, particularly in low visibility conditions.

The primary function of HIRL is to enhance visibility and assist pilots in recognizing runway boundaries and alignment. This is especially important for precision approaches, where maintaining a clear visual reference is essential for safety. HIRL systems are robust enough to stand up to adverse weather conditions and ensure pilots can safely land aircraft, thus supporting the operational requirements of modern airports.

Other types of lighting, like medium intensity lights and low intensity lights, do not provide the same level of visibility and guidance needed for precision approaches. Visual Approaches Lighting, while helpful for visual approaches, is not specifically designed for precision instrument landings, further highlighting the importance of HIRL in this context. Therefore, HIRL represents the best choice for ensuring safety and precision in runway operations for instrument approaches.