I want to note here that the Detroit area is in severely bad shape with regard to road types. I intend to start on reclassifying the roads in the area consistent with NFC at some point, but it's going to be a big project and anyone who would like to get started wherever they can is welcome to do so, of course.
Just to point out how absurd it is: https://editor-beta.waze.com/editor/?lo ... TT&env=usa
Metropolitan Parkway, which runs east-west, is in every way a thoroughfare. In fact, from Schoenherr Rd all the way to its eastern terminus, it's an expressway, with a 55 mph speed limit and grade access only at major intersections. Nevertheless, it, along with many other 45+ mph roads, is set as a "primary street". That doesn't even hold water along the current unclear standards.