When being tested, the women probably did not put on makeup in the rearview and brush their hair, which is more likely to happen in real life, so this is hard to study in a lab environment.
That's insanity. I ALWAYS brush my hair and put on makeup while driving. I can't be bothered to pause by something silly like parking. Sometimes, by the time I get to work, I've put on 12 layers of foundation, and completely brushed my hair out of my head. I keep a spare wig in the office for those occasions.