In a recent article, Forbes.com crunched national statistics and came up wit this conclusion: Atlanta has the worst commute in the United States. That's not too surprising to metro Atlantans who spend hours stuck in traffic. The magazine also cited how MARTA's rail system is limited. Atlanta's worst traffic is on what the radio traffic reporters call the Big Three: I-75 north, Ga. 400 and I-85 north. But it's no picnic to be on the top-end Perimeter or the Downtown Connector, either.