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Roads, railways and urban areas are frequently subjected to instability of rock slopes. Such instabilities can affect the superficial portion of the slope or involve its entire global stability. Rock fall protection systems are the key element in the design and maintenance of infrastructure networks and have a direct impact on safety.
The classical distinctions made between active and passive protection systems are these:
"Passive" systems are those that hinder or control rock falls or avalanches to protect the infrastructure below the slope; such as roads, railways, buildings, etc.-. Passive systems include:-