How can you determine if a runway has a displaced threshold?

Determining if a runway has a displaced threshold is most accurately done by looking for a white bar at the beginning of the runway. A displaced threshold is signified by a white threshold marking, which indicates that the portion of the runway before this mark cannot be used for landing but can be used for takeoffs in the opposite direction or for taxiing.

This specific marking is crucial for pilots as it helps them understand the safe landing area and the operational limits of the runway. The use of a white bar ensures that pilots can see this important information clearly during approach and landing.

Other options may provide some context about the runway's configuration but don't offer the definitive indication that a displaced threshold exists. A red bar would signify the beginning of runway markings that indicate where landings should commence, not displacement. Visiting the control tower or viewing the runway from the air may yield information but would not provide the immediate visual identification that the white bar does.