This summer, while visiting an old friends scrap yard, a brand new BMW 3-series car rolled in - literally. A teenager was "driving dad's car," says shop owner, with little apparent structural damage. The teen walked away, and normally the damage wouldn't have been hard to repair. But the BMW had so many air bags "it looked like a balloon parade". The new car, worth more than $30,000, was totaled.
Costly air bags, expensive electronics, and lightweight body materials are driving up…