The series ends where Part Two began: one small California county, three rail abandonments across forty-one years, and the 1956 highway act sitting in the middle having caused none of the first two. What survived was the alignments, one paved and one left a fire road. The claim is narrow: a nation that funded one mode automatically and the other by permission never chose between them.
The series does not claim highways were a mistake or that anyone was tricked, only that the nation never made a choice between modes. A recreational trail is not a substitute for a transit system, and the Claiborne Expressway's status is left uncharacterized.