[Tagging] Inconsistent road refs

[Paul Norman]

On 2/3/2016 1:35 AM, Martin Koppenhoefer wrote:
> why isn't it signed any more? Has the route stopped to "exist" and 
> they removed the signs on purpose (but just haven't finished yet hence 
> the signs on the crossing roads)? I would tag "old_ref" for situations 
> where the ref is no longer valid, but might still provide some useful 
> information today. E.g. in Italy a lot of roads have passed from the 
> national operator to the regions (admin entities), and changed their 
> refs accordingly (e.g. SS 4 to SR 4), and they also put some new signs 
> here and there, but they didn't remove a lot of the old signs, so that 
> you can find a lot of old refs still signposted. In this context we 
> have tagged also old_ref to these roads.
>
> If on the other hand the refs are still valid, but simply aren't 
> signposted on some stretches anymore, I would keep them in "ref".

What do you mean by valid?