What do markings on the taxiway edge consist of?

Taxiway edge markings are designed to define the limits of the taxiway and ensure safe navigation on the airfield. The correct answer, which identifies the markings as consisting of two solid yellow lines, accurately reflects the standard used in aviation to indicate the edge of a taxiway. This configuration is critical as it visually demarcates the taxiway boundary, signaling to pilots that they should not cross beyond these lines during taxi operations.

This clear delineation helps prevent aircraft from unintentionally straying into unsafe areas, such as those designated for runway operations or other obstacles. By utilizing two solid yellow lines, airfield safety personnel ensure there is a robust visual cue for pilots, thereby enhancing situational awareness and contributing to safe airfield operations.