Following the entrance to the Dora Valley near Rivoli, one would reach a small town called Susa. There were two forks in the town. One headed south; after reaching a place called Briançon, one could continue south to a place called Gap, then head west, emerge from the mountains at Valence, and follow the Ancient Roman road north to Lyon.
This was limited by ancient engineering methods. The earliest Simplon Road had a section of tunnel, and they had even used explosives. But before the invention of nitroglycerin, black powder's blasting effect was mediocre—perhaps not even as effective as Hannibal's method of heating rocks and then cooling them rapidly.
Another route headed north from Turin. When Georgiana came out of the Alps, she had passed through a small town called Ivrea. After reaching Aosta, there was another fork. The route she had taken in from Lausanne was Geneva Road. One section was particularly rugged and difficult; during Ancient Roman times, it had been a trail reserved exclusively for military use.
Heading west at the Aosta fork, one would reach Courmayeur, then go south through Moutiers and Albertville to reach Vienne. During Ancient Roman times, it was called Vienna, the same name as Vienna in Austria. To distinguish it, Vienne had adopted its current name.
From there, Lyon was very close. Before Mount Cenis Road was completed, this route had been the main transport route for Piedmont's raw silk. Now that Mount Cenis Road had been completed, they would enter the Alps through Rivoli, Turin, head north along Susa, and reach a small town called Moncenisio. There was a lake near the town called Lake Mont Cenis. Once they crossed it, they would arrive at an Ancient Roman road that had existed only in documents; it had long since vanished without