Thomas Ashby, 1911 Encyclopædia Britannica, Volume 27… (1911)
“ The difficult route from Cerfennia to the valley of the Aternus—a drop of nearly 1000 ft., involving too the crossing of the main ridge of the Apennines (3675 ft.) by the Mons Imeus (mod. Forca Caruso) —was, however, probably not made into a highroad until Claudius's reign: one of his milestones (Corp. Inscr. Lat. ix. 5973) states that he in A.D. 48–49 made the Via Claudia Valeria from Cerfennia to the mouth of the Aternus (mod. Pescara) . ”
