I believe the solution for the problem has already been mentioned: the used tag "maxspeed:advisory"=* seems a good way to make the distinction between actual maxspeeds and advisory maxspeeds: http://taginfo.osm.org/keys/maxspeed%3Aadvisory#values
Let's document this in the wiki, e.g. here: http://wiki.openstreetmap.org/w/index.php?action=edit&title=Key:maxspeed%3Aadvisory I have added a paragraph here: http://wiki.openstreetmap.org/w/index.php?title=Speed_limits&oldid=1176298 Feel free to modify / correct / amend it. Cheers, Martin
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