What does the term "approach end of runway" refer to?

The term "approach end of runway" refers specifically to a visual indication of runway entry. This area is crucial for pilots as it represents the point where they transition into final landing configuration while approaching the runway. The visual aids near the approach end, such as lights and signage, help guide pilots during their landing approach, ensuring that they align correctly with the runway.

This understanding is fundamental for operations at an airport like O'Hare, where precision in approaching runways is vital for safety and efficiency. It helps facilitate smooth transitions from approach to landing, minimizing any potential confusion during a time that requires a high level of concentration.