What is the meaning of REIL in airport lighting?

The correct answer refers to Runway End Identifier Lights, which are crucial components of airport lighting systems designed to enhance safety during takeoff and landing procedures. These lights are typically placed at the ends of runways and consist of a series of lights that help pilots visually locate the runway's ends, especially in low visibility conditions.

Runway End Identifier Lights serve to provide a clear indication of the runway's alignment, particularly at night or during adverse weather. This visual guidance aids pilots in ensuring that they are properly positioned for landing or takeoff, thereby reducing the likelihood of runway incursions or miscalculations in approach.

The other options, while they utilize similar terms, do not accurately describe the functionality or purpose of REIL. By identifying and illuminating the runway ends, REIL significantly contributes to operational safety and adherence to procedural protocols in airport management and operations.