Drivers who do not take the time to completely defrost their windows drive with a dramatically reduced field of vision. As Sargent Scott Kristiansen of the Buffalo Grove Police Department in suburban Chicago pointed out in a USA Today article: “Reasonable people who would never think of leaving their driveway with worn tires or bad brakes will routinely drive their children to school after scraping just a small peephole with which to see out of the vehicle.” In Illinois a driver can be cited for anything an officer deems to “materially obstruct” a driver’s vision.