You'd think that it would be mandatory since power windows die the moment you crash your car into water. Having a manual option to "roll down the window" would certainly save lives, I think. Rolling them down as you're sinking beats having to wait for the car to fill, equalize and then open the door if you can.
On a Mythbusters episode we learned that electric windows can stay working for a minute or more after a car hits the water. This isn't something I'm willing to test with my car, or with my body in the absence of SCUBA gear and a safety diver.
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