The Federal Highway Administration concluded that the main cause was a crack that grew undetected in one of the bridge's huge chain links, but that the high volume of traffic was also a factor.

NPR: Bumper to Bumper: Predicting Traffic Flow

It's difficult to track the exact role smartphones play in traffic accidents, since many wrecks are caused by more than one factor.

CNN: Will your next car be a smartphone?

Increased traffic came with a 1.8% jump in capacity and a slightly lower load factor, at 86.4%.

FORBES: Split The Booty: American Airlines Takes International, US Airways Takes Domestic

Then, providing they can reduce space launch costs by a large factor, they may be able to exploit new business opportunities, including passenger traffic to outer space.

CNN: Private space travel: A new era begins?