What is the purpose of a taxiway end marker?

The purpose of a taxiway end marker is to serve as a visual cue indicating the end of the taxiway. This marker helps pilots and ground personnel to identify the limits of the taxiway, ensuring safe movement of aircraft on the ground. By clearly demarking where the taxiway concludes, it reduces the likelihood of aircraft inadvertently straying off the designated path, which could lead to safety risks or accidents.

In the context of the other options, the markers are not used to signal runway openings or function as alerts for storm conditions or guidance to fuel stations. Each of those scenarios requires different types of signage or indicators tailored to their specific operational needs on the airport. Therefore, the marking specifically supports situational awareness and navigation on the airport's taxiway system.