3. Los Angeles, Calif.
AP Photo/Damian Dovarganes
A Blue Line light rail train is seen in Los Angeles.
The City of Angels is known for being among the worst in the nation for traffic, with delays estimated at 63 hours per driver per year. That may be why nearly 1.5 million people ride the L.A. metro bus and rail systems every weekday. To serve the sprawling metro area, the system operates 2,600 buses and a metro rail system that runs over 79.1 miles of track.
