INTERNATIONAL ONLY A vessel constrained by her draft may display which lights?

Correct Answer: Option D — Three all-round red lights in addition to the lights required for a power-driven vessel of her class

Rule 28 states that a vessel constrained by her draft shall display the lights prescribed in Rule 23 for a power-driven vessel, in addition to the three all-round red lights in a vertical line. This ensures she remains identifiable as a power-driven vessel while signaling her specific constraint.