Two milestones have been found, one at Rabland, a frazione of Partschins, near Merano in the South Tyrol and the other in Cesiomaggiore, near Belluno. Both are inscribed with the far terminus of the Via Claudia Augusta, Augusta Vindelicorum (modern Augsburg). The milestones indicate that two routes joined at Tridentium before crossing the Alpine pass: one found its starting point at the vicus of Ostiglia, near the Po, the other, its site less securely identified by archaeologists and historians, at the Adriatic port of Altinum, (near the Venetian Lagoon). On its way to Tridentium, that route crossed the Via Annia, which linked Adria to Aquileia, the Via Popilia, which linked Altinum with Rimini, the Via Aurelia, between Padua and Feltre passing through Asolo, and the Via Postumia, the road linking Genoa and Aquileia. This road was initiated by Drusus as a military artery of conquest and defence, and Emperor Claudius continued its development as a cultural and commercial artery with permanently populated posting stations where fresh horses would be available. Some grew into considerable settlements and were fortified during the later Empire. Others can be identified only by the findings of archaeologists. In the 2nd century AD, a second Alpine pass was opened to wheeled traffic, the Brenner Pass.