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For those of us living in the US, at least, I would think an important consideration is whether the vehicle can be registerable: i.e. whether it conforms with state safety regulations, justifiable or not.
My impression is that most states require D.O.T. safety glass.
That aside, Methacrylate plastics are amazingly strong, (and flexible!). Somewhere I saw a clip of huge projectiles being fired at bubble canopies at high speed. They simply bounced off. I'll try to dig it up
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