Question 851 Rules of the Road

90% to pass

BOTH INTERNATIONAL & INLAND A vessel which is unable to maneuver due to some exceptional circumstance, shall show two red lights in a vertical line and which additional lights or shapes?

A when making way at night, sidelights and a stern light

B during the day, three balls in a vertical line

C during the day, three shapes, the highest and lowest being balls and the middle being a diamond

D when making way at night, masthead lights, sidelights, and a stern light

AI Explanation

The correct answer is A) when making way at night, sidelights and a stern light. According to the International Regulations for Preventing Collisions at Sea (COLREGS), a vessel that is unable to maneuver due to some exceptional circumstance must display two red lights in a vertical line, as well as the normal navigation lights required for a vessel underway, which includes sidelights and a stern light. The other options are incorrect because they do not accurately describe the lighting requirements for a vessel that is unable to maneuver. Option B and C describe shapes, not lights, which are used for vessels that are not underway. Option D includes additional lights, such as masthead lights, which are not required for a vessel that is unable to maneuver.

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