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PS: A high conscription number like this (156) cannot be confused with a new house number. But a low number such as 10 can. When an ambulance driver enters a street name and a house number, and an address in the router database contains a the street name and both the old and new housenumber, the ambulance might get routed to the wrong address and the patient dies. Not a likely scenario, but in general that's the idea behind separating the old from the new address. The addr2:* schema is not common in CZ/SK, but I believe the Russians use it a lot. As far as I know, CZ/SK use another approach (like a tag for conscription number, another tag for orientation number, and a third tag for both combined) that wouldn't match common usage in AT.