Fiberglass is not transparent. As it stands, glass remains one of the strongest transparent materials we have available. Pretty much anything else you could put there that’s transparent would scratch far too easily and be impossible to see through within a matter of weeks, not to mention damage from UV exposure.
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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