System for stabilizing a motor vehicle, comprising: - at least one speed sensor for sensing a longitudinal speed and a transversal speed of the motor vehicle; - a calculation unit which is designed to calculate an attitude angle of the motor vehicle from the sensed longitudinal speed and the sensed transversal speed; - an evaluation unit which is coupled to the calculation unit and is designed to compare the attitude angle with a predefined threshold value and to detect an oversteering situation if the attitude angle exceeds the threshold value; - an actuation unit which is coupled to the evaluation unit, and an actuator which influences the driving behavior of the motor vehicle, wherein the actuation unit is designed to actuate the actuator in an oversteering situation in accordance with the attitude angle, characterized in that an optical speed sensor is provided for sensing the vehicle transversal speed and/or the vehicle longitudinal speed and is designed to sense and evaluate light which is reflected on a roadway surface on which the motor vehicle is moving during operation, in order to determine the vehicle transversal speed and/or the vehicle longitudinal speed, wherein the system also comprises a steering angle sensor for sensing a wheel lock angle which is set at steerable wheels (102a, 102b) of the motor vehicle and a further evaluation unit which is designed to detect an understeering situation on the basis of the attitude angle, of the wheel lock angle and of a vehicle model, wherein the actuation unit is coupled to the evaluation unit and is designed to generate actuating requests for influencing the driving behaviour in an understeering situation. - at least one speed sensor for sensing a longitudinal speed and a transversal speed of the motor vehicle; - a calculation unit which is designed to calculate an attitude angle of the motor vehicle from the sensed longitudinal speed and the sensed transversal speed; - an evaluation unit which is coupled to the calculation unit and is designed to compare the attitude angle with a predefined threshold value and to detect an oversteering situation if the attitude angle exceeds the threshold value; - an actuation unit which is coupled to the evaluation unit, and an actuator which influences the driving behavior of the motor vehicle, wherein the actuation unit is designed to actuate the actuator in an oversteering situation in accordance with the attitude angle, characterized in that an optical speed sensor is provided for sensing the vehicle transversal speed and/or the vehicle longitudinal speed and is designed to sense and evaluate light which is reflected on a roadway surface on which the motor vehicle is moving during operation, in order to determine the vehicle transversal speed and/or the vehicle longitudinal speed, wherein the system also comprises a steering angle sensor for sensing a wheel lock angle which is set at steerable wheels (102a, 102b) of the motor vehicle and a further evaluation unit which is designed to detect an understeering situation on the basis of the attitude angle, of the wheel lock angle and of a vehicle model, wherein the actuation unit is coupled to the evaluation unit and is designed to generate actuating requests for influencing the driving behaviour in an understeering situation.