Polarized glasses are great. Why not make vehicles with polarized windshields? Follow up, why not also make them with ceramics for better heat reflection?
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You don’t always want a tinted windshield because sometimes it is dark. You know, like at night. So polarizing a clear windshield doesn’t make much sense.
Plus, many sunglasses are polarized because as you said polarized glasses are great. But there is no standard to what orientation the polarization is, and if you try to look through two polarized filters that aren’t aligned then all the light gets blocked. It wouldn’t be good to put on your sunglasses and your windshield becomes opaque to your view!
There are also more minor issues like if someone else wearing polarized glasses looks at a car and their windshield is apparently opaque, blocking what might otherwise be useful or even critical view of and communication with the other driver. Like you can’t see if they are looking at you, waving at you, and they *think* you *can* see them, etc.
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