What do red and white airport boundary signs indicate?

Answer: B — They indicate the boundary of the movement area

The indication of red and white airport boundary signs as markers for the boundary of the movement area is rooted in their role in ensuring safety and adherence to operational protocols on the airfield. These signs serve a critical function by establishing the limits of the area where aircraft are authorized to move. The movement area consists of runways and taxiways, where aircraft can operate. By clearly marking this boundary, red and white signs help to prevent unauthorized access to areas where potential hazards may be present, thereby enhancing the safety of personnel and equipment on the airfield. Understanding this function is essential for all personnel involved in airfield operations, as it assists in maintaining operational efficiency and safety protocols, thereby reducing the risk of accidents or incidents that could arise from confusion regarding boundaries.