Which rule requires reducing speed and navigating with extreme caution in conditions of restricted visibility to avoid collision?

• A. Rule 19
• B. Rule 18
• C. Rule 2
• D. Rule 14

Answer: (A)

In restricted visibility the priority is to slow down and move with extra care so you can detect and avoid other vessels in time. This is addressed by Rule 19, which requires every vessel to proceed at a safe speed appropriate to the prevailing conditions of visibility and to have engines ready for immediate maneuver. In restricted visibility you must use all available means (lookout, radar, AIS, sound signals) to determine if there’s a risk of collision and be prepared to take early action.

Reducing speed isn’t just a suggestion here; it’s a practical way to ensure you have the time and distance needed to assess what’s around you and to respond safely. While general safety and collision avoidance concepts are covered by other rules, the explicit instruction to proceed with extreme caution in restricted visibility and to be ready to maneuver comes from Rule 19.