The main problem is that the windshield has to be laminated glass per DOT regs. In my X-Prize car, I was going to use a rear glass if I needed to, for the shape, with the established patterns to make the future windshields off of. There are many Lexan windscreens available for race cars that look very good, however, from my understanding, they don't pass with the DOT. Good enough for an F-16, but not safe for granny going to the store, Government efficiency in action. Plastic windshields all have the problem of scratching too.
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