Because we want people to be able to see very well. There isn’t any fiberglass out there that’s really clear; some of it is translucent, but that’s not really good enough. Plastics are generally too easy to scratch; a few hundred miles of road grit and they’d be too fuzzy to see through. It’s actually remarkably safe; very few injuries are caused by the windshield itself. And speaking as a volunteer firefighter, you don’t want it to be unbreakably strong; that’s one of the best ways to get you out of the car if we need to.
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