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8. Seattle

8. Seattle
Congestion score: 17.6 (tied for 7th highest)
Population density: 585.8 people per sq. mile (35th highest)
Average commute time: 27.6 minutes (22nd highest)
Percentage driving to work: 81% (20th lowest)

Congestion in Seattle actually improved in 2012, with the INRIX index score declining from 19.6 in 2011 to 17.6 last year. Despite this improvement, Seattle remains one of the most congested metro areas in the nation and had some of the most congested individual roads in the country in 2012. Among these was a nine-mile, southbound stretch of Interstate 5, which ranked as the 11th most congested corridor in the nation in 2012. Last March, the Seattle Times noted that new tolls on the nearby Highway 520 had led to increased congestion on Interstate 5.

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.