Abstract: The Makkah inner ring road project involves construction of four-vehicular tunnels and connectionroads around Holy Kabe in Saudi Arabia. The tunnels are horse-shoe shaped in cross section, double-tube, and ofvarying lengths. ,Quartz diorite of Preeambrian age consitütes the major bedrock along tunnel MIT-2, which is located approximately 1 km southeast of Kabe» The bedrock is frequuently crossed by felsite and dolerite dykes. Both the bedrock and the dyke rocks are strong to very strong.The joints developed within quartz diorite give rise to a large and/or very large blocky structure to the rock.The joints are generally widely spaced having tight and/or narrow apertures, and rough to planar surfaces. Theycontain neither infillings nor water.In order to provide a basis for tunnel support design, the rock mass quality is determined as «weak» at the tunnel portals and «good» away from the portals. It is further recommended that at the tunnel portals rockfall and othersimilar incidents may be avoided by the application of systematic bolting, wire meshing, and shotcreting. Awayfrom the portals random bolting and shotcrete application may be sufficient.