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The vehicle already weights 6k. And it wouldn’t add thousands. Polycarbonate would weigh a lot less. Bullet proof glass is designed for bullets and weighs a lot. Just replacing TV the glass with polycarbonate would make them virtually unbreakable and weigh a lot less.

Elon musk tweeted a joke that Tesla semi glass will withstand a nuclear blast or you get a full refund. It was a joke dude. You are really dumb.

What he actually claimed is that the glass won’t crack if a small rock hits it. The cost of the tougher glass is less than the average cost of downtime caused by cracked windshields. Truckers aren’t allowed to drive with cracks. So in reality there is some really straightforward logic behind the glass.