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1. Without prejudice to the other provisions of these regulations and to any other provisions applicable, boatmasters shall, on approaching and passing through movable bridges, obey any instructions given to them by the bridge staff to ensure safe and orderly navigation or quick passage. The boatmaster of a vessel shall announce his intention to navigate through the bridge to the bridge operators by means of a long blast or radiotelephone.

2. On approaching a movable bridge, vessels shall reduce speed.

If they cannot or do not wish to pass through the bridge, and if boards bearing the sign B.5 (annex 7) are placed on the bank, they shall stop short of those boards.

3. Overtaking when approaching movable bridges is prohibited unless special instructions are given by the bridge staff.

4. Passage through movable bridges may be regulated by the following signals:

(a) One or more red lights mean:

Passage prohibited;

(b) A red light and a green light at the same height or a red light above a green light mean:

Passage is still prohibited, but the bridge is being opened and vessels should prepare to get under way;

(c) One or more green lights mean:

Passage permitted;

(d) Two red lights one above the other mean:

The opening of the bridge for navigation is suspended;

(e) A yellow light placed on the bridge together with the marking referred to under (a) and (d) above means:

Passage prohibited except for vessels of reduced height; passage authorized in both directions;

(f) Two yellow lights placed on the bridge together with the marking referred to under (a) and (d) above mean:

Passage prohibited except for vessels of reduced height; passage prohibited in the other direction.

5. The red lights referred to in paragraph 4 above may be replaced by red-white-red boards (sign A.1, annex 7), the green lights by green-white-green boards (sign E.1, annex 7) and the yellow lights by yellow boards (sign D.1, annex 7).

6. The bridge operator is obliged to have on or near the bridge a radiotelephone device corresponding to the provisions of Article 4.05. For the entire duration of the navigation through the bridge, the radiotelephone device must remain switched on.