Try driving on a highway with not extra lighting. Makes a huge difference. I was talking to a guy I work with about windshield tint. One of our SEMA/show trucks had windshield tint at one time. He and another guy was driving it back from a show one niight when they hit a rainstorm and a highway that had just been paved and not lined yet. They couldn't tell whether or not they were even on the road. They had to rip the tint off because it was too dangerous.