Question for you all: What make Michigan state routes 5 and 10[1] trunks rather than primaries?
To my mind these are highway=primary mainly because of at-grade intersections.. I am still confused about what makes a trunk road in the US. To my mind it's roads with no at-grade intersections but not built to interstate standards / not having an interstate designation... I'm not looking to open up a can of worms but I would really like to understand. Martijn [1] https://www.openstreetmap.org/#map=13/42.5188/-83.3982
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