The Adaptive Highbeam Assist Plus, which is available in the new Mercedes-Benz S- and E-Class starting with 2013, is based on a stereo camera:
If its image recognition algorithm picks up a vehicle that is oncoming or driving ahead, it actuates a mechanism in the headlamp module. This module masks the portion of the LED headlamps' cone of light where there are other vehicles to prevent their drivers being dazzled. Consequently, the main-beam headlamps can be turned on at all times without irritating or even endangering other road users.
If road users are detected outside the area that can be masked – for instance when cornering with multiple vehicles in the headlamps' beams – the system will switch to the familiar system of headlamp range control using the low-beam headlamps. The Adaptive Highbeam Assist Plus is active at speeds above 30 km/h when travelling on roads without street lighting in the dark and therefore avoids manual start-up and switch-off processes. Besides that, possible backglare caused by increased use of the main beam and highly reflective signs at the side of the road is also detected and eliminated by dimming the headlamps accordingly.