In addition, Section 544.011 of the code states that a driver shall comply with any lawful order or direction given by a police officer. The officer has the legal authority to require a motor vehicle driver to roll down their window as part of a lawful order or direction during a traffic stop.
It's probably been a while since you took the Texas Department of Public Safety test to get your drivers license, let's see if you could still pass the test.
Why did I not know this until recently? I got my license when I was 16, literally....well nevermind it doesn't matter how many years ago it was but the point is no one ever bothered to tell me over the years that if I did this on my license, I could be breaking the law!