Efficient way of adding AH18 to route 42

Hi,

I was wondering if someone can recommend an efficient/automatic way of adding AH18 as an international reference to route 42?

You would create a new relation (in case it’s not existing) type=route, route=road, int_ref=AH18, network=AsianHighway and put all the affected roads into it.

http://wiki.openstreetmap.org/wiki/Asia/Asian_Highway_Network

If you’re asking on how to best select them, it’s clicking on “select members” on the existing relation of route 42 (right-click). Review the selection, maybe adding/removing ways, then add them to the AH18 relation.

Assuming you’re using JOSM. Maybe I don’t fully get your question. So if there is a different problem, please explain further.

I was thinking that some way of doing a query that would add int_ref=ah18 to all roads with ref=42 in Thailand would be an efficient way but I suppose using relations is also a way of doing this.