I bitched at my town PD about this once. Their new cars have bright white "takedown lights" that are intended to keep a target from looking at them directly. I don't think much of the idea in general, but these ones were aimed so high that they overshot the vehicle being stopped and blinded oncoming drivers instead. So I emailed the chief. I probably wasn't the only one. In any case, they both adjusted them more downwards and stopped using them so much, so it hasn't been a problem since. If you encounter the same problem, I suggest at least trying to find the right contact to let them know. You might be surprised by the result.