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1. Prohibition of passage through an opening in a weir may be indicated by:

One or more red lights or red-white-red boards (sign A.1, annex 7).

2. Passage through an opening in a weir is permitted only when the opening is marked to the left and to the right by:

A sign E.1 (annex 7).

3. By derogation from paragraph 2 above, in the case of weirs with an overhead bridge, passage through an opening may also be authorized by:

A sign D.1a or D.1b (annex 7) placed on the bridge above the channel.