In busy traffic in city centres or on long tiring journeys on motorways, it is easy to overlook a road user when changing lanes. This is because not all areas next to and behind the vehicle are made visible to the driver by the interior or side mirrors. The area that is not directly visible is colloquially referred to as the "blind spot". Nowadays, modern vehicles are equipped as standard with an electronic driver assistance system to solve this problem for the driver and at the same time ensure greater safety in road traffic. With the HELLA blind spot assistant, it is now possible to retrofit this driver assistance system to older vehicle models with plastic bumpers. The HELLA Blind Spot Assist monitors the traffic situation in the poorly visible close-range area behind and next to the vehicle with the aid of radar sensors mounted in the rear bumper. Two displays, positioned on the left and right of the A-pillars respectively, serve as warning indicators for the driver. When the vehicle is overtaken by another vehicle, the display on the corresponding side lights up continuously as soon as the approaching vehicle is detected by the radar sensors. The display goes out as soon as the overtaking process is complete. If the driver fails to notice this warning when changing lanes or overtaking, a warning tone will also sound as soon as the direction indicator is activated. At the same time as the warning tone, the display flashes at the same change interval. The driver is thus warned and can abort the lane change in good time to avoid a potentially dangerous situation.