"Merge like a zip" - but don't get yer pubes caught in the teeth.
My understanding is "give way to the right".
The lanes immediately to the sides of the centre lane are "the road", anything else is an "add-on" and by default are the ones that "end" when the lanes merge to one - therefore the leftmost lane is "finishing" in such cases and traffic in it must signal and merge, giving way to the "real" lane, as Spudchuka said.
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