The light and rain sensor, standard on all S6 models, automatically activates or deactivates the low-beam headlights and the windscreen wipers when required. This is particularly convenient, for instance, in unpredictable and poor weather, deteriorating light, entering tunnels, or simply, when it’s getting dark. And the rain sensor reacts to the strength of the rain – adapting the wiper interval accordingly – meaning you can just concentrate on driving.
Article source: www.audi.co.uk