So we're already the most stressed city in America and the worst city to drive through on Labor Day weekend. Now IBM has ranked Chicago fourth (tied with Boston) on its "Commuter Pain Index" list. You can check out the full report here [PDF]. We move up from our fifth-place tie with San Francisco last year. Los Angeles is number one, followed by D.C. and Miami. According to IBM's press release, there are 10 factors that go into their list:

Weekend Diversion: Night Of The Ponies