[Tagging] Potential proposal for more detail in old_ref=*?

[Albert Pundt]

The old_ref=* key seems to be used a lot for any previous designation of a
road, even decades before. Often a road will have had different
designations over the years. For example, I-676 in Philadelphia was
initially designated I-80S from 1957 to 1958, followed by I-895 from 1958
to 1960, I-76 from 1960 to 1974, and today I-676 since 1974. There's no
good way that I know of to represent all this.

Though previous designations aren't useful for most users, it can still
come in handy to map this data if someone wants to use OSM data to track a
former route, for example.

Ideally, a more detailed tag for I-676 would be something like this:

old_ref=1957-1958 I 80S;1958-1960 I 895;1960-1974 I 76

Would anyone else support such a proposal, or think it to be useful?

--Roadsguy
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