I've run a semi over-the-road before and one thing that is, in my opinion, critical is to have as up-to-date of an atlas as possible. On the trucking side of the fence - it is beyond the map accuracy because there are state regulations and contact info for local and state authorities in there, so those can be as important if TSHTF as knowing where the roads are (and I have had to use the "other" resources before, not that I want to but the point is having them when you need them is a blessing).

As far as the maps go - I found it interesting this summer that there was a new portion of Rt 53 through Minnesota that, to the best of my knowledge, was not passable in 2017 until some time in 2018 (haven't researched it in depth yet), that was listed in my 2018 Rand McNally atlas as the "new" route. What is interesting about it is if, at the time of publication, the road was the "old" route, how was it that the printed atlas could have the "new" route on it? If they went off of a proclaimed schedule of completion - who's to say a delay wouldn't show up? Then if the road was the "old" route in 2018 and the atlas showed the "new" route it would be incorrect.

I would think the dating of atlases might work better backwards than forwards. For example - how often is it that routes disappear vs new routes and bypasses being created? If you stick to an old route through a town - which you would do on a bicycle anyway - and there is a bypass route/4 lane freeway built around town (look at Burlington, WI for example) - who cares if a map/atlas doesn't show the new route? Now, if the old route through town disappeared (not likely) then that would be an issue to a cyclist.