1. Meeting or overtaking is permitted only when the fairway is unquestionably wide enough for simultaneous passage, taking all the local circumstances and movements of other vessels into account.
2. When vessels are proceeding in convoy, the prescribed signals in articles 3.17, 6.04 and 6.10 shall be shown or emitted only by the vessel carrying the boatmaster of the convoy.
3. Vessels on courses which preclude all danger of collision shall not change their course or their speed in a manner which might give rise to danger of collision.
4. A boatmaster seeing any danger of collision shall sound a series of very short blasts.