Can you actually refuse to roll your window down all the way on a traffic stop? It's not illegal to refuse to roll your window all the way down. That's not a lawful order. He can't make you roll your window down or arrest you for not doing so. What he can do is what he's about to do. And 99 times out of 100, if you roll your window down this far, guess what happens next? You're going to step out of the car because he's entitled to ask you out of the car. I teach people roll the window all the way down. Why are you going to antagonize this guy with a 3-in crack in your window? Why would you do that? It's just going to escalate his behavior, which is going to increase your chances of getting arrested.