Some cities are notorious for extreme traffic jams. Find out which is the worst when it comes traffic congestion in North America.
14. Portland, Ore. -- Average congestion level: 22 percent
Morning peak: 31 percent
Evening rush: 58 percent
Enrique Castro-Mendivil / Reuters
U.S. National Archives
REUTERS/ Stefano Rellandini
U.S. Air Force
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