Question 321 Rules of the Road

The correct answer is B) tug pushing a barge ahead. The illustration D075RR shows the navigation lights required for a tug pushing a barge ahead, as per the Inland Navigation Rules. The two red lights displayed vertically indicate the tug is pushing the barge in front of it, rather than towing the barge astern (option C) or the barge being pushed ahead without a tug (option D). The white masthead light and the two sidelights (red and green) are also consistent with the lighting configuration for a tug pushing a barge. The other options are incorrect because they do not match the lighting configuration shown in the illustration. Option A (barge being towed astern) would not have the two vertical red lights, and options C (tug towing a barge astern) and D (barge being pushed ahead) would not have the tug's masthead and sidelights visible.