There seems to be inconsistencies in how the roads are classified, with many National Highways being marked as trunk, primary, secondary, tertiary and even unclassified.
Based on http://wiki.openstreetmap.org/wiki/Nepal/Roads#Road_Classification and my own experience with roads in India, the tagging should probably be more like this: Trunk National Highway (ref=H##): trunk Feeder Roads (ref=F##): primary District Roads (ref=D##): secondary used with appropriate surface=* tag Can someone from the ground make any recommendations based on practical use? There does not seem to be any comprehensive documentation of how the existing tagging scheme came about and it looks quite messy. The forum has some discussion about this with no clear consensus: http://forum.openstreetmap.org/viewtopic.php?id=30221 -- Arun Ganesh (planemad) <http://en.wikipedia.org/wiki/User:Planemad> <http://j.mp/ArunGanesh>
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