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
The Finances and Public Buildings
An approximate measure of the condition of Roman finance at this period is furnished, in the absence of definite statements, first of all by the public buildings. In the first decades of this epoch these were prosecuted on the greatest scale, and the construction of roads in particular had at no time been so energetically pursued. In Italy the great southern highway of presumably earlier origin, which as a prolongation of the Appian road ran from Rome by way of Capua, Beneventum, and Venusia to the ports of Tarentum and Brundisium, had attached to it a branch-road from Capua to the Sicilian straits, a work of Publius Popillius, consul in 622.
On the east coast, where hitherto only the section from Fanum to Ariminum had been constructed as part of the Flaminian highway (ii. 229), the coast road was prolonged southward as far as Brundisium, northward by way of Atria on the Po as far as Aquileia, and the portion at least from Ariminum to Atria was formed by the Popillius just mentioned in the same year. The two great Etruscan highways-- the coast or Aurelian road from Rome to Pisa and Luna, which was in course of formation in 631, and the Cassian road leading by way of Sutrium and Clusium to Arretium and Florentia, which seems not to have been constructed before 583--may as Roman public highways belong only to this age.
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Reference address : https://www.ellopos.net/elpenor/rome/4-11-commonwealth-economy.asp?pg=21