What is the least preferred barrier type in terrain flight operations?

In terrain flight operations, the least preferred barrier type is a point barrier. This classification stems from the inherent limitations that point barriers impose on flight operations. A point barrier represents a specific, singular location or object, which can be difficult to navigate around or assess in relation to the surrounding terrain during flight.

In contrast, other barrier types such as line, area, and zone offer more extensive coverage and can encompass multiple potential hazards or obstacles over a broader space. A line barrier can provide a continuous reference along the flight path, while area and zone barriers allow for identification of larger sections of terrain that may require caution or avoidance. These broader categories facilitate better situational awareness and give pilots more flexibility in planning their routes to avoid terrain hazards.

Thus, point barriers, due to their limited scope and the difficulty in integrating them into effective flight planning, are considered the least preferable option for managing terrain risks.