How are the runway edge lights configured for the last portion of the runway?

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The correct answer is that the runway edge lights turn yellow for the last portion of the runway. This configuration serves as a warning to pilots that they are approaching the end of the usable runway surface. The yellow lights effectively alert pilots that they should prepare for a runway exit or consider the need to take other precautionary measures.

In contrast, continued display of white lights would indicate that the aircraft is still on the runway and has ample length for takeoff or landing, which would not provide the necessary alert about nearing the runway limit. Red lights typically indicate areas that should not be crossed, while alternating flashing lights are often used in different contexts, such as to signal caution in construction zones or areas undergoing maintenance. The use of yellow in this scenario is standardized in aviation practices, ensuring clarity and safety for all operations on the runway.