It's probobly partly because of the auto leveling feature as well. Sense xenons make such a crisp light line on the car in front of them sometimes you can see when they are slightly readjusting up and down to bumps or dips in the road or u hitting the breaks. It's a series of slight notches up an down and if you look hard enuf u will notice it. Not sayin that this is the reason for what u c but could be part of it.
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