Another innovation Mercedes-Benz offers is Active Blind Spot Assist, a system that makes use of a multi-stage warning concept. If the system detects that a lane change would be too dangerous, it warns the driver by displaying a red triangle in the glass of the exterior mirror. Close-range radar sensors monitor the area immediately to the side and to the rear of the car. If the driver disregards this warning and, for example, uses the turn indicator, an audible warning also sounds. If the driver continues to ignore the warnings and comes dangerously close to a vehicle in the neighboring lane, the system acts: a corrective braking intervention via ESP® is applied to the wheels of the opposite side of the vehicle. This causes a yaw movement about the car's vertical axis due to the unequal distribution of the braking forces. If an accident still cannot be avoided, the active Blind Spot Assist system can reduce the consequences of a collision through the brake actuation.