Which description best matches 'Slow down' in collision avoidance?

• A. Slight reduction in speed
• B. Very early and substantial reduction in speed
• C. Stop immediately
• D. Speed up to pass

Answer: (B)

Slowing down in collision avoidance means reducing your speed in a way that gives you more time to assess the situation and take appropriate action. The best description is a very early and substantial reduction in speed because it lowers the closing speed with any conflicting vessel and provides the time and space needed to decide whether to alter course, continue slowing, or take further measures. A small reduction often isn’t enough to reduce risk, while stopping immediately can be abrupt or impractical, and speeding up would only increase the danger. So, slowing down early and significantly best fits the intent of reducing risk and keeping a safe separation.