Some cities are notorious for extreme traffic jams. Find out which is the worst when it comes traffic congestion in North America.
6. Seattle -- Average congestion level: 27 percent
Morning peak: 47 percent
Evening peak: 68 percent
Enrique Castro-Mendivil / Reuters
U.S. National Archives
REUTERS/ Stefano Rellandini
U.S. Air Force
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Warner Bros. Television
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