Question 432 Rules of the Road

The correct answer is C) Two masthead lights in a vertical line. According to the International Regulations for Preventing Collisions at Sea (COLREGS), a power-driven vessel 45 meters or more in length pushing ahead or towing alongside is required to display two masthead lights in a vertical line. This is specified in Rule 23(b) of the COLREGS. The other answer choices are incorrect because: A) Two all-round red lights at the masthead is the lighting requirement for a vessel constrained by its draft, not a power-driven vessel pushing ahead or towing; B) Two towing lights in a vertical line is the requirement for the towing vessel, not the vessel being pushed or towed; and D) A towing light above the stern light is the lighting requirement for the vessel being towed, not the vessel doing the towing.