Which COLREGs rule outlines responsibilities in a Traffic Separation Scheme (TSS)?

• A. Rule 9.
• B. Rule 10.
• C. Rule 11.
• D. Rule 12.

Answer: (B)

Traffic Separation Schemes are designated lanes to separate opposing flows of traffic on busy routes, and the rule that governs how vessels must behave in and around a TSS tells you to use the appropriate lanes in the direction of traffic, keep to the starboard side of your lane, and avoid crossing or entering the separation lines unless it’s necessary and safe. Vessels not using the TSS should stay clear of it to minimize confusion and risk. This rule is the one that specifically addresses responsibilities inside a TSS, so it’s the best answer. Other rules cover different situations, like navigating in narrow channels or actions when vessels are in sight of each other, but they don’t directly govern TSS conduct.