INTERNATIONAL ONLY You see the lights shown in illustration D066RR below. What do these lights indicate?

Correct Answer: Option A — Vessel towing a barge alongside

Rule 24(c) specifies that a power-driven vessel when towing or pushing another vessel shall exhibit two masthead lights in a vertical line. When the length of the tow exceeds 200 meters, three lights are required. The configuration described indicates a vessel towing a barge alongside or pushing ahead.