I don't really know what to check there. Is a "highway" an expressway or a normal 50 MPH road?

My route is 80% rural, about 40% of it is gravel road (I haven't seen a "dirt" road for decades, at least not in this country. All gravel here). The remainder of the rural area is 2 lane 50+MPH road. I have about a mile in a small town, still 2 lane but with a center turn lane for most of it. The last mile has a rideable shoulder, apart from that, the white line is 2 inches from the gravel.

There are no paths anywhere around here as far as I know, at least none that go anywhere. There are some isolated parks with recreational trails that just go around in a circle.