What does a communication changeover point look like on an airport diagram?

A communication changeover point on an airport diagram is represented by a bolded zipper-looking line. This specific graphical representation indicates a location where pilots need to switch their communication from one frequency to another, often occurring during the transition between different air traffic control sectors or areas. The design of the line serves as a clear visual cue to help pilots easily identify when and where they need to make this important switch in communication, ensuring effective and safe operational procedures.

The other options, while they might depict various aspects of aviation diagrams or related markings, do not accurately represent the specific feature of a communication changeover point. For instance, a dashed line could signify different types of boundaries or restrictions in aviation but not specifically for communication changes, while a solid black circle may mark points of interest or navigational aids. A highlighted text box typically refers to annotations or notes but does not convey the changeover requirement visually as effectively as the bolded zipper line.