Active Cruise Control (ACC) in the BMW 3 Series Sedan.
A long journey on the motorway. The BMW 3 Series Sedan is cruising at a set speed. It approaches a slower car in the lane ahead, and automatically ACC reduces the Sedan's speed. When the vehicle ahead clears the lane, the Sedan returns to its previous speed - all without demanding the driver's attention. A short touch on the accelerator immediately disengages the system. (Cost Option)