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I think lanes are "supposed" to be organised so that the direction of rotation alternates with each lane. This means that swimmers in the adjacent lane, separated by lane ropes are always swimming in the same direction as you, and means that the only swimmers swimming in the opposite direction to you should be in your lane. The marginal improvement in safety seems pretty small to me but I guess it reduces the chances of painful arm clashes with people in the adjacent lane.
The reality is that I've seen all sorts of approaches in different pools and that there should be a sign at the end of the lane telling you which way to swim. One pool local to me is a free for all and you just have to go with whatever direction everybody else is doing.
Thank you @ewanmac for the detailed reply. That all seems very reasonable.
Is clockwise normal?