Drew said:
All it does is make sure that the beam doesn't shoot upwards unnecessarily high, hence blinding oncoming drivers (we've all had that happen before, I'm sure).
When you are driving over
the crest of a hill, shining the headlights in to the eyes of on-coming drivers is unavoidable with any headlamp system.
But my point is that it doesn't make sense for it to adjust the headlights, simply because you are driving up a hill.
When you are accelerating or stopping, the front end rises or lowers in relationship to the road.
That makes sense for the HIDs to adjust--when the front and the rear of the car are not parallel to the road.
However, if you are simply driving up a hill, the car is still parallel to the road--why would you want to adjust the headlight? If I'm driving on a horizontal road and the HIDs illuminate 20 ft in front of me, I would still want the 20 ft in front of me illuminated when I drive up a hill--I wouldn't want it adjusted down.
Or are you saying that when you drive up a hill the front end rises higher than the rear? That doesn't make sense.