The paper presents the investigation program and slope stability analysis of an active landslide situated on National road DN 1, major traffic way in Transylvania, Romania. Slope stability analysis was performed using Geo Fine software, considering circular or polygonal sliding surfaces and using GFAS software, applying FEM method. The investigation program is continued by a monitoring program to determine movements on the site and ground water table variation. On the site were placed inclinometers and piezometers, where the slope stability analysis indicates a lower value of the safety factor than the acceptable one.