loosely related but watched a video on BMW's adaptive headlights last night which was amazing. constant full beam effectively until it recognises a car ahead. It then angles the headlights to form a 'tunnel' ie deflects the beams away from the incoming car that it tracks via camera, so you have constant high intensity light without dazzling the other driver. Then when the car gets to the point where it's too close to be able to point a light away, it shuts off the nearside light until they pass and goes back to full beam when they do. for moth oncoming and same direction traffic, it's pretty amazing stuff