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Crossing situation in a traffic separation scheme

  • Description of scenario: Vessel A: Power-driven vessel engaged in towing operations, proceeding in appropriate traffic lane
    Vessel B: Power-driven vessel of more than 20 m in length, crossing traffic lanes
    Vessel C: Power-driven vessel , proceeding in appropriate traffic lane
    Area: Traffic separation scheme
    Visibility: Good (Vessels in sight of one another)
    Vessel B and vessel C are crossing so as to involve risk of collision
    Vessel B has vessel A on her own port side and there is no risk of collision
  • Rule(s) to be applied: Rule 8 (Action to avoid a collision)
    Rule 10 (Traffic separation schemes)
    Rule 15 (Crossing situation)
    Rule 16 (Action by give-way vessel)
    Rule 17 (Action by stand-on vessel)
  • Applying the Rule(s) and comments: Crossing situation in a traffic separation scheme (vessel B and vessel C):
    In accordance with Rule 10 (a) (Traffic separation schemes), Rule 10 applies to traffic separation schemes adopted by the Organization and does not relieve any vessel of her obligation under any other rule.
    In accordance with Rule 10 (b)(i) (Traffic separation schemes), a vessel using a traffic separation scheme (vessel A and vessel C) shall proceed in the appropriate traffic lane in the general direction of traffic flow for that lane.
    In accordance with Rule 10 (c) (Traffic separation schemes), a vessel (Vessel B) shall so far as practicable avoid crossing traffic lanes, but if obliged to do so shall cross on a heading as nearly as practicable at right angles to the general direction of traffic flow.
    In accordance with Rule 15 (Crossing situation), when two power-driven vessels are crossing so as to involve risk of collision, the vessel (vessel B) which has the other (vessel C) on her own starboard side shall keep out of the way.
    In accordance with Rule 15 (Crossing situation), vessel B shall, if the circumstances of the case admit, avoid crossing ahead of vessel C.
    In accordance with Rule 16 (Action by give-way vessel), every vessel (vessel B) which is directed to keep out of the way of another vessel (vessel C) shall, so far as possible, take early and substantial action to keep well clear.
    In accordance with Rule 17 (a)(i) (Action by stand-on vessel), where one of two vessels is to keep out of the way (vessel B) the other (vessel C) shall keep her course and speed.

    Comments:
    In accordance with Rule 10 (a), Rule 10 applies to traffic separation schemes adopted by the Organisation and does not relieve any vessel (using a traffic separation scheme) of her obligation under any other Rule. So, in all situations in traffic separation schemes consider that if there is a risk of collision, the rules applicable for such situation would apply. In the case of crossing situation in a traffic separation scheme, Rule 15 (Crossing situation) would apply.
    In accordance with Rule 15 (Crossing situation), when two power-driven vessels are crossing so as to involve risk of collision, the vessel (vessel B) which has the other (vessel C) on her own starboard side shall keep out of the way.
    In accordance with Rule 10 (c) (Traffic separation schemes), vessel shall so far as practicable avoid crossing traffic lanes, but if obliged to do so shall cross on a heading as nearly as practicable at right angles to the general direction of traffic flow. Crossing traffic lane on a heading not near to right angle due to collision avoiding action doesn't mean contravening the Rule's.
    In accordance with Rule 8 (a) (Action to avoid collision ) any action taken to avoid collision shall be taken in accordance with the Rules of this Part and shall, if the circumstances of the case admit, be positive, made in ample time and with due regard to the observance of good seamanship. Vessel B may slow down and leave vessel C to pass ahead or alter her course to starboard and pass astern of vessel C, but slow down action could bring vessel B in a crossing situation with vessel A so as to involve risk of collision. In accordance with good seamanship, vessel B shall decide to alter her course to starboard and pass astern of vessel C.
  • Actions: In accordance with the ordinary practice of seamen, vessel B may take the following action to avoid collision or close-quarters situation.

    a) Vessel B may alter her course to starboard to avoid collision with vessel C and pass astern of vessel C on safe distance.

  • Graphics:

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