I consider the visual lane assistance as it is named - as an assistance
useful where there are several options.
If there is no assistance anybody who get the advice "take the exit"
(*) should obviously use the rightmost lane.
So even _no_ turn lane tagging would be an option for me in this (quite
normal) case.
(*) Please do not cry "What about left-hand driving" - it is a
right-hand example!
And any unusual left exit _should_ be tagged with lane assistance.
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