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
With the more western Ligurian tribes, who held the Genoese Apennines and the Maritime Alps, there were incessant conflicts. They were troublesome neighbours, accustomed to pillage by land and by sea: the Pisans and Massiliots suffered no little injury from their incursions and their piracies.
But no permanent results were gained amidst these constant hostilities, or perhaps even aimed at; except apparently that, with a view to have a communication by land with Transalpine Gaul and Spain in addition to the regular route by sea, the Romans endeavoured to clear the great coast road from Luna by way of Massilia to Emporiae, at least as far as the Alps--beyond the Alps it devolved on the Massiliots to keep the coast navigation open for Roman vessels and the road along the shore open for travellers by land.
The interior with its impassable valleys and its rocky fastnesses, and with its poor but dexterous and crafty inhabitants, served the Romans mainly as a school of war for the training and hardening of soldiers and officers.
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Reference address : https://www.ellopos.net/elpenor/rome/3-07-peace-hannibal-third-period.asp?pg=10