[toyg]

It only includes roads and locations mentioned in two sources: the Peutinger map ("tabula Peutingeriana" [0]) and the Itinerarium Antonini [1]. Clearly you've found where those sources lacked precision.

[0] https://en.wikipedia.org/wiki/Tabula_Peutingeriana

[1] https://en.wikipedia.org/wiki/Antonine_Itinerary