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2. A single motorized vessel may in addition more than 110 m long shall be required to carry by night at the stern a second masthead light placed in the axis of the vessel and at least 3 m 3 m higher than the forward light, in such a way that the horizontal distance between these lights is at least three times the vertical distance. A single motorized vessel more than 110 m long shall be required to carry this second masthead light.

3. A single motorized vessel temporarily preceded by night by an auxiliary motorized vessel shall continue to show the lights referred to in paragraphs 1 and 2 above.

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These scintillating lights shall be placed one above the other about 1 m apart, in a suitable position and high enough to be visible from all directions.

5. When passing through the opening of a fixed or closed bridge or weir, or when passing through locks, vessels may carry the masthead lights provided for in paragraphs 1 and 2 above at a reduced height so that passage may be effected without difficulty.6. The provisions of this article shall not apply to small craft or ferry-boats.

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