Some of the most used historical tags are for things that are just old, not necessarily disused or with another use than the original one. Wayside cross and shrine, monuments, memorials, castles etc. It just seems to signify a special relationship with history, not much more than that.
But then there is the conflict with other historic tags a road might have. On the other hand, if cutting does not imply "constructed" it seems like the perfect fit. But the wiki for cutting seems to imply this ("an excavated section"). Also, cutting can be defined as left/right/both, which is kind of possible for sunken lanes too. So that makes me think of a third solution, where we use a dedicated tag sunken_lane=yes. This could then be seen as a fine-tuning of cutting. Data consumers would then have to look for a subtag to decide what kind of cutting it is. Or we could define it as "do not use it together"; say if you combine it, it would mean "a former sunken lane that has now been artificially cut". Doing this would also make it possible to add a left/right value for cases where the sunken lane is very asymmetrical. But that would mean an entirely new tag. In all, I think I like historic=sunken_lane best. In the cases where two values apply, well, that's just part of a bigger issue we'll have to deal with somewhere else. As for the word hollow_way, seems there is still some discussion about that, so we now have six options :) I still haven't heard of a procedure to vote on tag A over tag B, so I've invented my own. You can vote here: https://framadate.org/ApOlIj5ePZvrTjz8 I'll adapt the proposal to whatever wins and put that up for a vote.
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