Tagging upgraded/expanded NHs

Many NHs across the country are seeing expansion from single carriageway to dual carriageway setups, and as part of this the new NHs often get route realignments. How do I add these new NHs to the existing NH relation? Should the old single carriageway segments be removed and put into a new “old NHxx” relation? Or should both be kept in the same NH relation? I added a few segments of NH161’s new 10 lane setup here: Way: ‪NH161‬ (‪1239017017‬) | OpenStreetMap but I wasn’t sure how to add it to the NH161 relation. Any help on the preferred way to handle this?

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/tagging-upgraded-expanded-nhs/107972