“…Over the last two decades, several qualitative risk rating systems (QRSs) have been proposed in order to reduce the potential consequences of rockfalls, and information technology systems (involving the use of electronic data sets, video images, lidar-based technologies, and GIS) have been implemented by several authors and transportation agencies in the USA, Canada, Australia and elsewhere (Pierson et al, 1990;Franklin and Senior, 1997;Bateman, 2003;Rose, 2005;Drumm et al, 2005;Liang et al, 2006;Pack et al, 2007;Youssef and Maerz, 2012;Russell et al, 2008;Mekni et al, 2008;Ferrero et al, 2011;Lato et al, 2012;Mignelli et al, 2012).…”