>The idea is that with a 30 driving rules list applying to an agglomération

If it's just the traffic rules urban vs. rural, there's the tag (with 37 000+ 
uses)

zone:traffic=**:rural
zone:traffic=**:urban

where ** is the two letter country code.

Don't count on anything ever deriving the rules (like maxspeed) from that tag, 
so tag the maxspeed anyway.

If, on the other hand, it's about the area that is considered "agglomerated", 
irrespective of the (not) implied traffic rules, there are probably/apparently 
different rules in every country for calculating the area, for example by 
buffering all residential buildings and combining the area formed by that 
operation.

-- 
Alv


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