Minh Nguyen
As far as I know, the only on-the-ground vestiges of this route are the roads named after it (along the same corridor but not necessarily the same exact alignment) and at least one Confederate monument that was installed after the fact. The route is of no interest for navigation or wayfinding.

I’d be in favor of deleting the route (potentially copying it and its members to OpenHistoricalMap) and also tagging any road named Dixie Highway along this corridor with name:etymology:wikidata=Q818896.

Elsewhere, particularly in the South, some old alignments of the Dixie Highway have been preserved, but I don’t think they merit a larger-scale route relation.