Councilman Eric Garcetti once explained to a group of people that traffic is a sign, a good sign. A sign of a strong economy. If there was no economy, people wouldn't be traveling to their jobs, thus causing traffic. Today in the print edition (and in the blog yesterday), LA Times' Road Sage, Steve Hymon, backs that theory up. He shows two different maps: one of population density and another of job density. "The maps......