BMW Active Cruise Control is a cruise control system that can not only maintain a constant speed, but also adjust the speed automatically to ensure that you always remain a safe distance from the vehicle in front of you. A sensor on the front of the vehicle has a range of up to 650 feet and monitors the distance between your vehicle and those ahead of it in the same lane. When the space between cars reaches a predefined distance the system will slow you down to the speed of traffic, maintaining a safe gap. When one of the vehicles changes lanes and space opens up your car will accelerate back up to the preset speed.
With the Stop & Go function the system will bring the car to a stop if necessary. If the vehicle has only been stopped momentarily it will drive on when possible; if it has been stopped longer the driver may need to tap the accelerator or press a button on the steering wheel to get the car moving. This system can help increase safety and driver comfort when driving in heavy traffic.