robc007 wrote:Detroit can't afford primary streets. :}
Lol. They can't afford to maintain them anyhow.
You may want to look at any of those that you're changing from Street to make sure they aren't county highways. I had to add the county highway alternate names to the ones in northern Michigan because they weren't on there as alternate road names from the import. I noticed you added them to the section of the roads around Cheboygan that I wasn't able to do yet, so you probably already noticed that. I'm not sure how they are in southern Michigan as I haven't looked down there yet.
And I definitely agree with using Primary Street on regular roads that have a more important use than normal streets. Any road that the majority of traffic would use to get from point A to point B could probably be labeled as a Primary Street without being incorrect. As long as point A and point B are not close to each other (eg. the majority of traffic from one block to the next would use the same route, but that doesn't make it a primary street).
Roads labeled "County Road XXX" on the street sign probably would make sense as Primary Streets as well, though I am not sure that I've had any specific experience driving roads with that label, so I am not sure how accurate that is.