In terms of cost...
Cost and Weight Added by the Federal Motor Vehicle Safety Standards
That's about $500 in current money. And about two dozen pounds. But do note... the prices can and do go down over time. That's why everyone has been using Takata... and why the recall was so devastating... economies of scale make it easier to fold airbag prices invisibly into the cost of the car, so many manufacturers share airbag suppliers.
What that means, however, for non-Takata users, is that your airbag costs, potentially, as little as it did in 2001 or possibly less. And that cost is ridiculously easy to fold into the price of a car... where other options, like radio, satnav, and heated seats already add a nice premium to the price from which manufacturers earn a tidy profit.
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One takeaway from the FMVSS study cited, however, is seatbelts. $125. I'd rather spend a little more than that and have five point belts that keep you far away from the roof, the roll-hoops and the dashboard.
That would eliminate the need for airbags, entirely, and make crashes much safer, and make me very happy.
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Unfortunately, you can't wear a five point with a skirt.
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Oh well.