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1. On approaching a section marked with the prohibitory signs A.4 or A.4.1 (annex 7),

(a) On waterways for which “downstream” and “upstream” are defined,

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− Prohibition of passage shall be indicated by a general prohibitory sign (A.1, annex 7);

− Authorization of passage shall be indicated by a general “entry permitted” sign (E.1, annex 7).

Depending on local circumstances, warning of the sign prohibiting passage may be given by the mandatory sign B.8 (annex 7) used as an advance sign.

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