We already have default speed limits within urban zones defined by a polygone. No relation here. Now, you are talking about an exception to the default speed limit and I hope, it is a minority of streets in this case. Then just simply add the tag maxspeed to these ways, thus overriding any default values. Why are you making you life so complicated ? Are you going to create a relation or a polygone for all oneway streets or streets with bicycle lanes in your town ? A speed limit is nothing else than a property of a street. Pieren
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