INTERNATIONAL ONLY You have sighted three red lights in a vertical line on another vessel dead ahead at night. Which vessel would display these lights?

Correct Answer: Option A — A vessel constrained by her draft

Rule 28 specifies that a vessel constrained by her draft shall display three all-round red lights in a vertical line. This signal is distinct from the lights used by vessels restricted in their ability to maneuver or vessels aground, providing specific information regarding the vessel's operational limitations.