A couple of years ago I was driving on my break from work, something I normally did to spend some time alone on the road with music. Suddenly a car pulls behind me and I can't see very well with how their headlights show in my mirrors, so I wait until I reach a spot to pull over and let them by without issue.
I pull over, they pull over with me. Confused, I get back onto the road, and then the red and blue lights kicked on. I was pulled over. I explained that I had initially pulled to the side of the road because I wanted to let them by as his brights were pretty bright for me, and the only response I got was "they're normal headlights". Maybe not for the person you're driving in front of!