Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Following in the steps of Claudius, the Roman senate wove around Italy that network of roads and fortresses, the formation of which has already been described,(39) and without which, as the history of all military states from the Achaemenidae down to the creator of the road over the Simplon shows, no military hegemony can subsist.
39. Cf. II. VII. Construction of New Fortresses and Roads
Following in the steps of Claudius, Manius Curius built from the proceeds of the Pyrrhic spoil a second aqueduct for the capital (482); and some years previously (464) with the gains of the Sabine war he opened up for the Velino, at the point above Terni where it falls into the Nera, that broader channel in which the stream still flows, with a view to drain the beautiful valley of Rieti and thereby to gain space for a large burgess settlement along with a modest farm for himself. Such works, in the eyes of persons of intelligence, threw into the shade the aimless magnificence of the Greek temples.
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Reference address : https://www.ellopos.net/elpenor/rome/2-08-law-religion-army-economy-nationality.asp?pg=38