Most traffic-congested cities in North America

Published On: Jan 30 2013 12:47:14 PM PST   Updated On: Jun 05 2014 07:43:26 AM PDT

Some cities are notorious for extreme traffic jams. Find out which is the worst when it comes traffic congestion in North America.

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14. Portland, Ore. -- Average congestion level: 22 percent

Morning peak: 31 percent

Evening rush: 58 percent

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