You make compelling points. A real problem is the blurring of physical road type, administrative class and importance. These are three separate things. I was trying to suggest minor modifications/clarifications to get more consistency without a wholesale replacement.
But, as I understand trunk, it's meant to be a physical upgrade from primary, which is a national-level highway. I've driven in .ie, and don't remember the numbering scheme, but the non-motorway main roads between towns that are not divided and have at-grade junctions and have national-type numbering seem like they ought to be 'primary'. And it seems that's how it is - the N62 from Thurles to the M8 (amusingly, someplace I've been to - the horse and jockey pub shows up at z12) is tagged as primary. http://www.openstreetmap.org/?lat=52.6539&lon=-7.8013&zoom=12&layers=B000FTF The N8 is trunk when it isn't M8, and I'm guessing N/M is a hint that it doesn't quite meet motorway standards, but I don't remember this well enough.
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