BOTH INTERNATIONAL & INLAND The display of lights shown in illustration D048RR below could represent which vessel?

Correct Answer: Option B — a tug and a barge being towed astern

Rule 24(a) requires a power-driven vessel towing to display masthead lights. When the length of the tow exceeds 200 meters, three masthead lights are required. The presence of sidelights and a stern light confirms the vessel is underway and actively engaged in the towing operation as prescribed by the Rules.