ABSTRACT: Toppling is a failure mode observed in rock slopes with parallel and almost vertical discontinuities which are inclined in to the hill. The rock slope excavated in Eocene aged tuffs, is located in the Devgeriş (Samsun) district of Black Sea coast highway, and exposed to discontinuity-controlled failures. As a result of the quarry operation at the northwest side of studied rock slope, some cracks occurred along the direction of J2 (245/80) joint set. Therefore, the kinematic and FEM-based numerical analyses were carried out in order to investigate the possibility of discontinuity-controlled failures. The results of the kinematic analyses showed that toppling failure is possible along the J2 joint set. It was determined that the factor of safety value is 0.86 for the worst condition and 1.23 for current condition when possibility of toppling failure is investigated by numerical analyses. After bolting or slope flattening, the rock slope becomes stable