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Abstract: After the tragic events of Mont Blanc (39 fatalities), Tauern (12 fatalities) and St. Gotthard tunnels (11 fatalities) occurred in the years 2001-1999 in Europe, the importance of tunnels in human, economic and cultural terms have been recognized and addressed through the Directive 54/2004/EC [1]. This aims at fixing minimum safety requirements for tunnels longer than 500 meters in the...