The GPS in my car says something like take the A5 towards Brno. It always tells the ref and one of the names on the sign. Furthermore it displays a sign with the ref and some names. Typically more than one name, but not all of them I think. and it displays the number of lanes in that direction (and in the other direction). It also shows whether a lane is shared for both directions.
So no, ref alone is not enough if you want to replace commercial systems with OSM :-) regards m
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