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1. Los Angeles

1. Los Angeles
Congestion score: 28.8
Population density: 2,646.0 people per sq. mile (2nd highest)
Average commute time: 28.6 minutes (15th highest)
Percentage driving to work: 84.1% (38th lowest)

After being replaced by Honolulu for a year, Los Angeles once again earned the title of the most congested metro area in the country. In 2012, on a Friday at 5 p.m., the average driver wasted more than 28 minutes in traffic. Four of the 10 most congested corridors last year were in the Los Angeles area. The worst is an eight-mile stretch on Interstate 405. Los Angeles also had the second highest population density of any metro area in 2010, behind only New York, at 2,646 people per square mile. Only these two metro areas exceeded 2,000 people per square mile that year. However, in Los Angeles, commuters were far less likely to get to work via public transportation. In 2011, just 6.2% of area workers took public transit to work, versus 31.1% in the New York area.

The 10 U.S. cities with the worst traffic

Last year, the average American driver wasted 38 hours sitting in

traffic. While the occasional traffic jam inconveniences most drivers,

some unlucky people live in the nation’s most congested cities. To determine the 10 cities with the

worst traffic, 24/7 Wall St. reviewed figures published by INRIX, a

traffic information and services group. The INRIX scorecard assigns an

index score for the 100 largest metropolitan statistical areas, and

individual road segments within those areas. Scores are functions of the

percentage difference between road segments’ uncongested (or “free

flow”) travel time and the calculated travel time on the roads during

peak hours. 24/7 Wall St. also reviewed population density from the 2010

Census, as well as travel time and commuting methods for each metro

area from the Census Bureau’s 2011 American Community Survey. All data

used were the most recent available. These are the 10 cities with the

worst traffic.