"McGuire, Matthew" <matt.mcgu...@metc.state.mn.us> writes:
> I see three dimensions of road classification at play here. > > 1) System > 2) Function > 3) Observed Character I think you have this exactly right. I view current practice as more or less a blend of system (interstate/us/state) and observed character (trunk), with a nod to function, where e.g. Massachusetts 2 is tagged as primary because it is as important (if not more so) than a US highway in terms of how people view it and in terms of how people use it (it's the major E/W route in the north half of the state, so it's arguably more important than US 20 wich is superceded by I90 for long distance travel).
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