http://wiki.openstreetmap.org/wiki/Highway
"key:highway" is used for all roads, from footways, to paths, to tracks,
to motorways.
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HB: added construction tag
http://wiki.openstreetmap.org/wiki/Key:construction
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RP: looks good, but we need to ensure the road is pointing the correct way if it is one way, assuming the direction data is included
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HB 21 Aug 2012: Using the NZOGPS group's cleaned up version for the mainland, but we can merge the Antarctic roads by hand. So tagging with that in mind. Updated a number of the fields, more needs to be done for the mainland if this data is to be used there. Should be ready for the Antarctic, pending review.
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