Question 801 Rules of the Road

The correct answer is D) a towing light above the stern light. According to the navigation rules, both international and inland, a vessel towing a barge must display a towing light above the vessel's stern light. This configuration helps other vessels identify the tow arrangement and navigate accordingly. The other options are incorrect because: A) two towing lights in a vertical line is the configuration for a vessel engaged in towing another vessel astern, not a barge; B) only a stern light would not indicate the presence of a tow; and C) two white lights in a vertical line is the configuration for a vessel not under command, not a towing vessel.