## 3 The Case Study of \"P.R. 264\" Linear Infrastructure  
\"I-PRO MONALISA\" tool has been tested to investigate vulnerability of a part of Provincial Road \"P.R. 264\", located in the Cilento, Vallo di Diano and Alburni National Park, in Salerno Province, southern Campania region (Italy). About 15 km long, the considered section of road overpasses three different villages: Omignano, Orria, and Salento. The study area is one of the most interesting in the Campania region, combining peculiar geological characteristics with valuable natural resources and different lithologic, structural, hydrogeologic, and geomorphological settings (Figure 3).  
In regards to tectonic setting, Cilento-Vallo di Diano and Alburni National Park belongs to the Southern Apennines fold and thrust belt, which developed between late Cretaceous and Pleistocene as a consequence of the interaction between the European and the African plates and of the spreading of the Tyrrhenian oceanic basin [50]. Due to the long time and complex lithogenetic and orogenetic history, several litho-stratigraphical units, in the form of nappes and/or irregular sequences can be distinguished. The study area is located along the Alento river valley where the main outcrops are represented by lithotypes of Sicilide Units and North Calabrian Units (Mesozoic-Tertiary) [51], they are made up prevailingly of marly calcarenites, calcilitites, clays, often siliceous, sandy clays, sandstones, and conglomerates which had been sedimented in terrigenous basinal domains. In the area arenites mainly crops out intercalated with argillites and silistones, called Pollica Formation, commonly weathered at the outcrop. Further, the investigated area is almost continuously overlaid by  
Figure 2: “Slope instability kinematics-surveyed damage level” matrix for vulnerability assessment of linear infrastructures.  
a heterogeneous debris cover, consisting of arenaceous and conglomeratic blocks of different sizes, in a silty-clayey matrix.  
Figure 3: Location of “P.R. 264” linear infrastructure in Campania Region (**a**), in the geological sketch map of the Cilento area (**b**) (modified from [52]) and its reference on the orthophoto map (**c**) and on a Digital Terrain Model (DTM) (**d**).  
In regards to geomorphological setting, the test site is characterized by hilly morphologies with low-medium gradient slopes, widely affected by several erosional and gravitational phenomena: Among them, landslides hold a top-rank position. The lithological and hydrogeological differences of involved terrains are among the main factors predisposing to instability: Their lithological and structural features result in a poor mechanical strength and, thus, in a high ratio between the mobilized and the available shear resistance, even in the case of low angle slopes.  
As shown in the official landslide map (Figure 4) provided by Hydro-geomorphological Setting Plan (HSP) of South Campania River Basin Authority in 2012, 24 landslides have been surveyed as interacting with a 100 m buffer zone along \"P.R. 264\" and classified as translational/rotational slides, slow moving flows, and debris flows. Moreover, in regards to the state of activity, in 2012, 22 landslides phenomena were classified as dormant and two as active. Due to the low seismicity of the area, local reactivations are usually triggered by intense and continuous rainfall, as demonstrated by damage occurrence in the limited portion of landslide boundary.