In this method, streams of traffic proceeding in opposite or nearly
opposite directions are separated by separation zones (4) or lines (3); the use of zones
LS to be preferred, but in narrow passages and restricted waters it may be necessary to
use a separation line rather than a zone so as to allow more navigable space in the
traffic lanes. A length of separation line may also be substituted for a zone in positions
where this may encourage and facilitate correct procedures by crossing traffic. The
outside limits (6) of such traffic separation schemes are the outer boundaries of the
traffic lanes. The arrows (1) indicate the established direction of traffic flow.