The quote from VW on ACC, ( i typed it out so i may have spelt things wrong

).
"ACC adapts the damping control and shock absorption rate to the road conditions and driving style you require within milliseconds. At the touch of the button, you decide how firm or comfortable you wish to set the suspension, with the choice of three settings: Normal, Comfort, or Sport. In the normal mode, the principle advantage of the system is that the dampers are constantly adjusted to the road and the driving conditions. In the sport mode, the dampers are considerably stiffer and the
steering becomes more responsive. A direct contrast to Comfort mode were the suspension is adjusted to maximum passenger comfort, particularly when travelling on poor road surfaces or long motorway journeys."