What command should be given when an officer approaches a blocked passageway?

The command "Gangway" is specifically used to alert individuals to clear a passage for an officer who is approaching a blocked area. This term is traditionally used within military and formal contexts to signify urgency and instruct people to move aside promptly. Using "Gangway" clearly indicates that an officer needs the space to pass through, promoting safety and order.

Other commands might not convey the same level of urgency or specificity. For instance, "Attention" is a command for individuals to stand straight and be ready for instructions but doesn't indicate that they should move. "Make way" and "Clear the way" are also valid phrases for similar scenarios but may not have the same immediate recognition or effectiveness as "Gangway" in a formal setting. The use of "Gangway" in this context is thus most appropriate for ensuring that the officer can traverse the area without obstruction.