ROAD SURFACE SCAN uses a stereo camera positioned behind the windscreen. "It measures the road up to 15 metres in front of the vehicle and with a height measurement accuracy better than around 3 millimetres", as Cytrynski explains how the system works. This provides a precise picture of the road surface profile. Together with the information on the driving conditions, the control unit continually calculates the best control strategy for dealing with unevenness in the road. Based on this, the active suspension is able to make the damping firmer or softer within fractions of a second in advance and individually for each individual wheel, and increase or decrease the load on each wheel via the active hydraulics. This can reduce vehicle body movements significantly. Since ROAD SURFACE SCAN is a camera-based system, it functions during the day in conditions of good visibility and on suitably surfaced roads as well as at speeds up to 130 km/h.