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TomTom launches Congestion Index based on traffic database; congestion levels in 57 cities in North America and Europe

Green Car Congress

Tampa, 25%. London, 27%. The top ten most congested cities in North America, ranked by overall congestion level, between January and March 2012 were: Los Angeles, 33%. Vancouver, 30%. Miami, 26%. Seattle, 25%. San Francisco, 25%. Washington, 24%. Houston, 23%. Toronto, 22%. Ottawa, 22%. Marseille, 41%. Brussels, 34%. Paris, 32%.