1. If there are regulations or special requirements laid down by the competent authorities prohibiting lateral berthing near a vessel (for instance, because of the nature of its cargo) that vessel shall carry on deck, in the longitudinal axis:
A square board with a triangle below.
Both faces of the square board shall be white with a red border, and have a red diagonal from the top left to the bottom right with the letter ‘P’ in black in the centre.
Both faces of the triangle shall be white and show in black figures the distance in metres over which berthing is prohibited.
2. By night, the boards shall be illuminated so as to be clearly visible on both sides of the vessel.