Rural roads in the United States are something to be especially wary of when using OpenStreetMap derived maps. They are often un-updated TIGER data from 2008, prior to Census doing a big push on accuracy. There are issues with roads being poorly located (or not existing), but there are also issues with little or no differentiation between roads, so a nice new asphalt highway might be classed the same as a barely passable dirt road.<p>One reasonable strategy would be to stick to things that are labeled as state or US highways.<p>(with enough scale, it should be possible to use traffic data to figure out which roads should be prioritized, but programs like OSMAnd are not yet doing that)