10 Worst Cities for Traffic

En español | If you feel like you've been spending more teeth-gnashing time than ever in your car, you're probably right — driving time nationwide jumped 10 percent last year.

See also: Most dangerous cities for driving.

Is gridlock a problem in your city? — Photo by Getty Images

The fourth annual National Traffic Scorecard released by INRIX, a leading provider of traffic information and services, shows that congestion grew in 2010 because of a combination of the country's burgeoning population and the rebounding economy. Now, Americans traveling the worst traffic corridors spend up to 80 extra hours a year in their car during their afternoon commute alone.

According to the scorecard, 70 of the 100 most populated U.S. cities saw a bump in traffic. And fasten your seat belt: If the jobless rate falls to 7 percent by 2012, as some economists expect, the newly employed will make 9 million more daily commuting trips, adding to the gridlock.

Most Congested Cities
Here's a list of the 10 most congested cities in the United States, based on an analysis of traffic on major highways in the 100 largest metropolitan areas. These cities account for more than half of U.S. traffic bottlenecks.

Next: Traffic's bests and worsts. >>