CART uses harnesses. F1 uses harnesses. IndyCar uses harnesses. And yes, NASCAR uses harnesses. They very rarely break. There's been some talk that Earnhardt had his mounted in a non-standard way, at his own order -- in which case, there was human failure, and the human responsible has paid for it in full.
Despite the fact that CART and NASCAR cars are both cars, and piston-powered at that, they really are very different designs, as a casual glance will tell you. They're not even made from the same materials. Often they are not racing on the same tracks; in fact, a check of Daytona's website reveals there are no CART events there.
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