| Regional or national deviation from Article is possible under the provisions of Chapter 9 |
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,
− Vessels or convoys proceeding upstream shall stop at the approach of vessels or convoys proceeding downstream and wait until they have passed through the section;
(b) On waterways for which “downstream” and “upstream” are not defined,
− The corresponding rules in article 6.07 apply.
2. If, in order to prevent any meeting, the competent authorities prescribe alternate one-way traffic:
− 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.