> As a general rule, should highway=trunk be used for routes on the National > Highway System? Considering that those routes are generally more backbone > routes, more important than a lot of primary routes, it makes sense that > they should be tagged with trunk. > --Roadsguy >
The formulation on the wiki page http://wiki.openstreetmap.org/wiki/Highway:International_equivalence does not make any reference to the National Highway System, at least so far. Looking at the NHS Wikipedia page https://en.wikipedia.org/wiki/National_Highway_System_(United_States) I would say the answer to the question should probably be "no", as the NHS roads are defined on certain importance criteria and this assignment seems to be orthogonal to the road classification system, whereas the OSM tagging is based on the road attributes, layout and traffic usage classes.
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