The major Decumanus goes from the door Segusina to the one that was merged with the castle of the Acaia first and then into Palazzo Madama. The road had a very wide carriageway, about ten meters and a half, and possessed sidewalks about one and twenty meters wide, bordered by a regular row of square blocks of stone. The roadway was paved with large polygonal stone bases, laid out regularly, under which ran the sewer pipes.
GAT scheme