Adaptive Brake Assistant: A practical addition to the Adaptive Cruise Control (ACC) system. The radar sensors at the front of the car measure both the distance to the vehicle ahead and its current speed. If the vehicle ahead stops suddenly, or if an obstacle appears in the lane ahead, the Adaptive Brake Assistant calculates whether emergency braking must be applied, and the necessary amount of brake pressure.

Having calculated the optimum braking power, the system activates the brakes only after the driver has applied the brake pedal. It also gives the driver warning signals: depending on the model, visual warnings are provided on the dashboard or on the Head-Up Display. The type of warning differentiates between a cautionary signal (e.g. if the vehicle ahead is too close) or an acute alert to a critical situation (e.g. the vehicle ahead brakes suddenly).