A barge over 50 meters long must show how many white anchor lights when anchored in a special anchorage area?

Answer: B — Two

When a barge that is over 50 meters in length is anchored in a special anchorage area, it is required to display two white anchor lights. This regulation ensures proper visibility and signals to other vessels that the barge is anchored, enhancing safety in navigation. The use of two lights is particularly important for larger vessels since they occupy more space and may not be as easily seen, especially in conditions of reduced visibility. In special anchorage areas, the requirement for two anchor lights supports the need for enhanced signal clarity, as these areas may have unique traffic patterns or vessel types. This is consistent with the standards set forth in the USCG Rules of the Road, which aim to prevent collisions and ensure that all vessels are properly marked, regardless of whether they are in common anchorage areas or designated special anchorages.