In Italy we've been using something like
maxspeed=50; source:maxspeed=IT:urban
maxspeed=90; source:maxspeed=IT:rural
+1 in France:
maxspeed=50; source:maxspeed=FR:urban
maxspeed=90; source:maxspeed=FR:rural
maxspeed=130; source:maxspeed=FR:motorway
maxspeed=30; source:maxspeed=FR:zone30
maxspeed=20; source:maxspeed=FR:living_street
Although for the last two, speed limit is included in the
corresponding traffic sign design.
http://wiki.openstreetmap.org/wiki/Key:source:maxspeed
Eric
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