"key:highway" is used for all roads, from footways, to paths, to tracks,
HB: added construction tag
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
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.