Forbes: America's Most Congested Cities and Worse Intersections

From Forbes:

Read about Worst intersections.  

Read about Most congested cities.  

To determine America's Most Congested Cities, Inrix collects data from nearly 800,000 anonymous, GPS-equipped commercial vehicles--in the 100 largest census-defined metropolitan statistical areas--that report their speed and location continuously. Inrix then processes and blends other relevant traffic-related data such as road sensors, toll tags, traffic-incident data and other resources to figure out when, why and for how long particular roads experience bottlenecking.