Which bar is used to delineate a displaced threshold from other areas?

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The demarcation bar is specifically designed to differentiate a displaced threshold from surrounding areas, especially on runways. It is a solid yellow line located perpendicular to the runway centerline and serves to notify pilots about the presence of a threshold that is not aligned with the runway’s physical beginning. This marking is crucial because it helps to prevent confusion for pilots during landings and takeoffs, especially when they are approaching a runway where the usable length is not where the runway begins visually.

In contrast, taxiway edge markings are utilized to outline the edges of taxiways, while visual approach slope indicators provide angled guidance for a glideslope during approach but do not delineate thresholds. The runway threshold bar marks the physical beginning of the runway but does not serve the purpose of indicating a displaced threshold. Thus, the demarcation bar is the correct marking for identifying a displaced threshold area.