@SomeoneElse, here are some examples of the types of roads involved.
Unpaved Tertiary 1. Unpaved tertiary road in summer 2. Unpaved tertiary road in autumn 3. Unpaved tertiary road near dams and power generating stations 4. Unpaved tertiary road with bridge 5. Unpaved tertiary road in winter 6. Unpaved tertiary road in winter - in use
Unpaved Unclassified 1. Unpaved unclassified 2. Unpaved unclassified 3. Unpaved unclassified 4. Unpaved unclassified, typical of service roads leading to cabins 5. Unpaved unclassified, typical logging road that will deteriorate over time
Unpaved Track 1. Track beside paved highway 2. Track beside unpaved tertiary 3. Track that was an unclassified road but has deteriorated 4. Track through scrub underbrush 5. Track that was an unclassified road but has deteriorated 6. Track that appears overgrown from satellite photos 7. Track through small trees 8. Track on muddy ground 9. Track on rocky ground