If black boxes can't destruct even in an airplane crash, then why aren't ground vehicles made out of the same material that black boxes are made out of so that they're far more crash-worthy than they are now?
by 
Egao No Genki
ANSWERS: 6
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Expense.
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If it weren't too expensive, they would be able to make the entire airplane out of it, as well as all modes of transportation, cars, trains, etc.
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It has absolutely NOTHING to do with material cost or fabrication in any way. It has EVERYTHING to do with WHAT the box is designed to protect. For starters, the human body would NOT be able to withstand the hundreds or even thousands of Gee's of forces applied to the contents of a typical "Black Box" in a crash. So even if you built an automobile out of the same "material", it wouldn't do any good. Ground vehicles, with living occupants, couldn't be built with those specifications. And even if they were, it wouldn't do any good. Imagine sealing up a human being inside and indestructable steel box, even with airbag technology and other modern restraints in place, and slamming it into the ground at 400 plus knots. Pulp. Ground vehicles are designed the way they are in order to absorb the maximum amount of energy as the vehicle crumples in an accident PRIOR to those collision energies reaching the occupant so that the vehicle's restraint and protective systems can absorb the rest.
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The vehicles would be much to heavy. They would be tremendous gas guzzlers.
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basically weight, and therefore, expense.
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Some of them are made, like those vans that bring money to banks, called armored trucks. They cost a lot, they are really heavy and slow. Would you rather buy a an 8 million dollar car instead of a car that is cheap and light and fast?
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