The is no summary for this season.In the central reservation between the dual carriageways of via di Acqua Acetosa Ostiense, near the modern overpass of via Cristoforo Colombo, archaeological investigations revealed the ancient passageway of Via Laurentina. It is located in the basin of the Fosso di Vallerano where the alluvial valley lead to the volcanic area of the Colli Albani. The field investigations revealed the best approach used by the Romans in building the road, overcoming the morphological obstacles of this territory like hills, plateaus and alluvial valleys. Also the proximity of the river with its floods led the repair of the Roman road up to five times, dating from the late Republic to the 3rd Century AD. The excavation established the exact relationship between the climate events, described by the ancient authors, and the alluvial deposits that covered the road levels. In addition to this, the stratigraphy revealed evidence of the road maintenance works made by the Roman Government.