What I've tended to do in my part of Texas is:
Motorway - two or more consecutive intersections with grade separation and
no driveways, or any interstate (some very rural locations do have the
occasional turn off directly from the main travel lanes)
Trunk - US highways without any other reason to
There was a discussion on this list ("Road classification") a short while ago about the "Highway" tag that should be revisited. Someone posted a classification system back in December that made a lot of sense, and is more in sync with what I know commercial data providers. Basically, it would be
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