PPR — Main roads (tav. P2-P5-P6)

The linear figure identifies the main roads of Piedmont. The data derives from the shape file of the CSI traffic graph and has been modified by the Land and Landscape Sector to select only the main roads本线性图示呈现了皮埃蒙特大区（Piedmont）的主要道路。该数据集源自CSI交通图谱的Shapefile文件，并经土地与景观部门（Land and Landscape Sector）修改，仅筛选保留了其中的主要道路。