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1. Vessels carrying out transport operations involving certain flammable substances that are referred to in ADN shall carry, in addition to the marking prescribed elsewhere in these regulations, the following marking in accordance with the requirements of sub-section 7.1.5.0 or sub-section 7.2.5.0 of ADN:

By night:

A blue light;

By day:

A blue cone, point downwards

as indicated in ADN, Chapter 3.2, Table A, column (12) or Table C, column (19).

These markings shall be in a suitable position and high enough to be visible from all directions. The blue cone may be replaced by one blue cone at the bow and one blue cone at the stern of the vessel, at a height of not less than 3 m.

2. Vessels carrying out transport operations involving substances constituting health hazards that are referred to in ADN shall carry, in addition to the marking prescribed elsewhere in these regulations, the following marking, in accordance with the requirements of sub-section 7.1.5.0 or sub-section 7.2.5.0 of ADN:

By night:

Two blue lights;

By day:

Two blue cones, point downwards,

as indicated in ADN, Chapter 3.2, Table A, column (12) or Table C, column (19).

These markings shall be placed about 1 m one above the other, in a suitable position and high enough to be visible from all directions. The two blue cones may be replaced by two blue cones at the bow and two blue cones at the stern of the vessel at a height not less than 3 m.

3. Vessels carrying out transport operations involving explosives that are referred to in ADN shall carry, in addition to the marking prescribed elsewhere in these regulations, the following marking, in accordance with the requirements of sub-section 7.1.5.0 or sub-section 7.2.5.0 of ADN:

By night:

Three blue lights;

By day:

Three blue cones, point downwards,

as indicated in ADN, Chapter 3.2, Table A, column (12).

These markings shall be about 1 m one above the other, in a suitable position and high enough to be visible from all directions. The three blue cones may be replaced by three blue cones at the bow and three blue cones at the stern of the vessel at a height of not less than 3 m.

4. When a pushed convoy or side-by-side formation includes one or more of the vessels referred to in paragraphs 1, 2 or 3 above, the marking prescribed in paragraphs 1, 2 or 3 above shall be carried by the vessel propelling the pushed convoy or side-by-side formation.

5. Pushed convoys propelled by two pushers side-by-side shall carry the marking referred to in paragraph 4 above on the starboard pusher.

6. Any vessel, pushed convoy or side-by-side formation carrying out a transport operation involving several dangerous substances that are referred to in paragraphs 1, 2 and 3 above shall carry the marking corresponding to the substance that requires the greatest number of blue lights or blue cones.

7. Any vessel not required to carry the markings referred to in paragraphs 1, 2 or 3 above but which has been issued with an approval certificate in accordance with section 8.1.8 or a provisional certificate in accordance with section 8.1.9 of ADN which conforms to the safety provisions for vessels referred to in paragraph 1 above, may, on approaching a lock, display the markings referred to in paragraph 1 above, when it wishes to pass through the lock with a vessel required to display the markings referred to in paragraph 1 above.

8. The intensity of the blue lights prescribed in this article shall be at least equal to that of ordinary blue lights.