What is displaced thresholds?

Displaced thresholds are runway markings indicating the portion of the runway that is not suitable for landing or takeoff due to permanent obstructions such as buildings, trees, or other structures. A displaced threshold shortens the runway length available for takeoff or landing.

Pilots must be aware of the displaced threshold when planning their landing or takeoff for their aircraft's performance capabilities. The length of the displaced threshold is marked by a line perpendicular to the runway's centerline with arrows indicating the usable part of the runway beyond the displaced threshold.

The runway's touchdown point is moved beyond the threshold, allowing aircraft to clear obstructions during takeoff or landing. This strategy provides added safety and allows airports with limited land availability to operate with larger aircraft.

In some cases, the displaced threshold may be used temporarily due to maintenance or construction on the runway's surface. The displaced threshold markings remain in effect until the obstruction is removed or the runway is repaired.