Je déterre de loin (oui c'est pas le record), suite à une info trouvée sur le net, apparemment ça ne serait pas uniquement une question d'activation automatique, mais aussi une gestion de la portée :
Motorway mode takes advantage of the large amount of light and optimized pages and apron lighting xenon plus pig launcher. Using sensors, a vehicle electronic system continuously analyzes the speed of the vehicle. After a short time above 110 km / h, the system is based on a car ride and automatically switches from low-beam mode in motorway light mode. A special position of the aperture in the xenon plus headlights additional light is now focused by an aluminum reflector and thrown far ahead of the vehicle but without dazzling other road users. The sight is more than doubled: from 70m to 150m in low-beam mode, motorway light mode. This increase in visibility means at a speed of 130 km / h has a gain of 2 seconds to respond to objects in front of the vehicle can. Motorway mode thereby increasing the driving safety significantly.
Et en plus indiqué 110km/h...
