I have noticed that my units will follow old roads that no longer exist or old alignments of existing roads (where the path has been changed). They will also not follow any new roads that have been created in the last six years or so it seems. Specifically, in my area a large expressway/loop around town has been completed in phases over the last eight years. None of the segments that have been opened in the last six years are usable by my units.
What, if anything, can be done to fix this?