I’m sure this isn’t a new topic, but is there a more clear-cut distinction between what should be considered a minor highway versus a primary street? At least in my area the distinction seems rather arbitrary. Sometimes there are typical residential roads marked as “minor highway” while more open roads connecting separate communities are just “primary roads”. Sometimes there are even roads that transition from one type to the other at seemingly arbitrary points.
Is there better guidance on how these road types should be determined?
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This is usually determined by local mapping guidance (as per your country). If you can tell us which country you’re based in I can move your post to the relevant category.
In the US, we follow Functional Classification (FC) for most things. Anything else is an exception and there are a few.
The best bet is to reach out to your state leadership for more information. I suggest joining the Northwest Region on discord (link in my signature). The Washington editors will be glad to help. I’ll probably chime in as well, as the Region Coordinator.