Architecture and Art. The complex of the gate was built from a rectangular building with two fronts with openings and with surrounding land. The hinge plates are visible in the remains of the line of the open front, made up of the bases of pillars in reinforced lateritious stone with points of tuff. Between the two fronts there was a courtyard. No trace remains of the walls that united the two fronts, just as nothing has remained of the republican gate, which must have been located in a position behind the current imperial façade.
It must be assumed that there were two guard towers alongside Borsari Gate and that there were guard rounds to join the two fronts, permitting precise and careful control of those who entered and exited from the city: a veritable fortified filter.
The plan of this complex is typically “Italic”, with two fornixes, and is one of the most ancient. Porta Borsari is therefore important as a prototype of an element of military engineering that Rome also developed in the Gallic territories and Hispanic provinces.