Worst Traffic In The World

According to Tom Tom, Istabul has the worst traffic in the world. 

While I'm not surprised by the top 9, I am surprised by number 10. Los Angeles? Really? I know the 405 and the 10 are horrible, but Los Angeles doesn't feel like it belong in the top 10. I have experienced traffic in Beijing, Bangkok, and Kuala Lumpur and I can honestly say that the traffic there are worse. Kind of curious about their methodology and how reliable is this study.