What does the yellow demarcation bar marking indicate?

The yellow demarcation bar marking is used to indicate the beginning of the runway available for landing when there is a displaced threshold. This marking visually separates the area of the runway that is usable for landing from other areas, such as a blast pad or stopway, which are not suitable for landing but may be adjacent to the runway.

When pilots recognize this marking, it informs them that while they may not land on the displaced portion of the runway, they do have a defined area where landing can occur safely beyond the threshold. This helps maintain operational safety by clearly delineating usable parts of the runway from those that are not.

In this context, the demarcation bar contributes to clarity in runway operations, guiding pilots in making informed decisions on approach and landing.