1. You are accelerating. Release the accelerator to activate Distance Control (ACC with Stop&Go).
2. You are driving too slowly. The Distance Control (ACC with Stop&Go) can only be activated from a speed of 30 km/h.
3. Bad visibility. The Distance Control (ACC with Stop&Go) uses a camera. If its function is temporarily limited, e.g. due to extreme weather conditions or a heavily polluted windscreen, the "Distance Control cannot be activated".