Transport a 2008 Toyota Camry back to the "Car of Tomorrow" exhibit at the 1964 World's Fair and they'd never buy the hype. "Seven airbags?" they'd say, "And no jet pack? Yeah, sure." Those were the days before Ralph Nader penned his auto-safety call to arms, "Unsafe at Any Speed," putting auto safety on regulators' and engineers' short lists for the next several decades. And it's far from over: A massive road-safety research initiative in Europe is aiming for a technological framework within which cars would be entirely smash-proof.