6.13 The minimum widths of traffic lanes and of traffic
separation zones should be related to the accuracy of the available position-fixing
methods, accepting the appropriate performance standards for shipborne equipment as set
out in IMO resolutions and recommendations.
6.14 Where space allows the use of traffic separation zones, the
width of the zone should, if possible, be not less than three times the transverse
component of the standard error (measured across the separation zone) of the most
appropriate of the fixing methods listed in paragraph 6.11. Where necessary or desirable,
and where practicable, additional separation should be provided to ensure that there will
be adequate early indication that traffic proceeding in the opposite direction will pass
on the correct side.
6.15 If there is doubt as to the ability of ships to fix their
positions positively and without ambiguity in relation to separation lines or zones,
serious consideration should be given to providing adequate marking by buoys.
6.16 The extent of a mandatory routeing system should be limited
to what is essential in the interest of safety of navigation and the protection of the
marine environment.
6.17 It shall be possible for ships to fix their positions in
relation to a mandatory routeing system by one or more of the means mentioned in paragraph
6.11 of this section."
Converging and junction areas
Whichever of the several available routeing methods is chosen for use
at a route junction or in a converging area, it must be a cardinal principle that any
ambiguity or possible source of confusion in the application of the 1972 Collision
Regulations must be avoided. This principle should be particularly borne in mind when
establishing or recommending the direction of traffic flow in such areas. If recommended
directions of traffic flow are adopted, these should take full account of the existing
pattern of traffic flow in the area concerned, and also of all other applicable provisions
of ships' routeing.
6.19 At route junctions the following particular considerations
apply:
.1 the need to encourage the crossing of traffic lanes as nearly as
possible at right angles;
.2 the need to give ships which may be required to give way under the
1972 Collision Regulations as much room to manoeuvre as possible;
