I've never relied on topo maps as road maps. I've found that even the newer ones often label as roads those which have been abandoned or at least no longer are safe for lower-clearance vehicles. I use either Forest Service maps or (more often) the latest Benchmark atlas. A call to the appropriate USFS ranger station just before the trip is also a good idea, especially in this era of frequent forest fires and weather effects such as washouts, etc.

For example, in SW Washington, many of the USFS roads are labeled by name instead of number. Somewhere just south of the latitude of Mt. St. Helens, only names are used. Only the Benchmark Atlas has both names and numbers!

The road maps, of course, stay in my vehicle.