That is a good point. You could have a county/secondary state/farm road that acts like a primary highway or could be a major arterial/county parkway/etc it would be at least primary but if it's a US route that is a dead end, it would be secondary unless there is a linking for primary and higher. River Road can link back to Gaithersburg through MD 112. Primary should have been placed earlier to avoid inconsistencies with the map placement and placement of classifications