Originally Posted by F30Spida
In fact it's more finely controlled than that, as I understand it. Supposedly the camera in front of the rear-view mirror vectors the light from the oncoming car and dips only part of the light on the side of the oncoming car. The remaining lights are then pointed away from the oncoming car.
The high-beam assist that's part of the visibility package on EU/ROW-spec cars is infinitely variable (i.e. not just 2 discreet settings). In the current BMW product portfolio only the F30 have that equipped with bi-xenons, it isn't available on any other BMWs apart from the F01/02 LCI & F12/13 & only then with adaptive LED headlights option.