Look at the bottom-rear corner of a typical rear door, and you’ll notice that it curves upward around the rear wheel opening. Vehicle designers have been dealing with the conflict between rear window glass and wheel-well packaging for decades. Power-window safety rules govern how switches and certain automatic-closing systems operate, but they don’t require rear windows to remain partially raised. That misconception came up in a recent Reddit discussion about why rear windows don’t roll all the way down. So the next time your rear window stops with four inches of glass still showing, don’t blame the switch.