In the locality of Passerelle a long stretch of the via ad Allifas, showing two partially overlying phases, was brought to light. In the earliest phase the road was 8 m wide and bedded in the natural tufa bedrock on the bottom of which a small drainage channel had been cut. It was on an east-west alignment and towards the north was supported on a very substantial roadbed which must have facilitated the overcoming of the change in height of the terrain which sloped down towards the east. Only patches of the surfaces were preserved, constituted by medium and small trachyte chippings with smoothed surfaces, bonded with earth and bedded in a layer of tufaceous terrain containing fragments of pottery, brick, grey tufa and trachyte. Evidence from trenches excavated in the roadbed indicated a chronology of within the first half of the 2nd century B.C. These trenches also revealed the presence of a cemetery, contemporary with the phase I road, which produced plain buff ware cinerary jars associated with the scattered remains of the grave goods.

The phase II road, traced for over 100 m, preserved intact for 24 m, was 2.90 m wide, reaching 3.10 m including the margines. At six metre intervals the sidewalks were interrupted by wayside posts put into place like stele. The lave-stone paving showed clear traces of wear due to time and the passage of carts, the wheelbase of which was calculated to be 1.60 m. Deeper trenches revealed very little datable material with the exception of two important fragments of Italian sigillata. However, from these trenches it was possible to reconstruct the reuse of the earliest phase of the road. Almost at the road’s eastern edge there was an area paved with basoli inserted into a stopping place made up of pottery fragments and trachyte chippings that was accessible via an interruption in the kerb. The phase two road seemed to be datable to the end of the 1st century B.C.