Glass is overrated. Where I live, you get another +$300 windshield and the next day you get a rock slung at you and it cracks. Then you have to have it replaced AGAIN!.
And glass may be stronger than polycarbonate; I really don't know. But I've seen rocks thrown by other cars go right through the glass windshield (and even right through the driver's seat!) Thankfully I haven't known anyone who has died from a rock through a windshield, but I'm sure it's possible.
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