America's Driving Less, and This Evidence Suggests It's Not About the Economy

Driving has been on the decline in the United States since 2004, as researchers have documented every which way. What they still don't know, though, is precisely why. The answer likely has to do with some messy mix of rising gas prices, changing demographics, new technology, a souring economy and the shifting preferences of Millennial drivers. But it's tempting to lean on some of those explanations more heavily than others.

The economic theory is a particularly deceptive one. If you believe that driving trends have gone south because the economy has, too, then that means U.S. policy doesn't need to adjust to a new transportation reality less focused on cars. Wait long enough, and everything will go back to the old normal.