The roads were standardized to 15 feet (4.6 m) wide allowing two chariots to pass, and distance was marked with milestones.

[4] The Via Aurelia crossed the Tiber by way of the bridge Pons Aemilius, then exited Rome from its western side.

[6] The Via Aurelia later was extended by roughly 320 km (200 mi) in 109 BC by the Via Aemilia Scauri, constructed by M. Aemilius Scaurus.

This road led to Dertona (modern Tortona), Placentia, Cremona, Aquilea, and Genua, from which travellers could proceed to Gallia Narbonensis (southern France) by way of the Via Postumia.

[7] By the time of the high Empire, travellers could go from Rome by way of the Via Aurelia across the Alps on the Via Julia Augusta to either northern France or Gades (modern Cadiz, Spain).