TomTom's 20 Most Traffic Congested Cities

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TomTom's taking traffic congestion to the future, aggregating speed data from its in-car navigation systems to pinpoint precisely which cities have the worst traffic congestion. Here's their scientifically-derived 20 most traffic-clogged cities. The results may surprise some.

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TomTom collected data from its Tele Atlas business system GPS data to determine what streets were "congested." In order to qualify a driver has to travel at only 70% or less than the posted speed limits. And while cities like Los Angeles and New York make the top five, it's actually Seattle, Washington at the top of the pile with 43% of the roads considered congested. Full details in the gallery.

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Rank: 20th
City: Houston, Texas
% Of Roads Congested: 23%
Population: 2.24 million

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Rank: 19th
City: Portland, Oregon
% Of Roads Congested: 23%
Population: 557,706

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Rank: 18th
City: San Juan, Puerto Rico
% Of Roads Congested: 24%
Population: 422,655

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Rank: 17th
City: Long Island, New York
% Of Roads Congested: 24%
Population: 7.45 million

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Rank: 16th
City: Phoenix, Arizona
% Of Roads Congested:
Population: 1.57 million

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Rank: 15th
City: Austin, Texas
% Of Roads Congested: 25%
Population: 757,688

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Rank: 14th
City: Philadelphia, Pennsylvania
% Of Roads Congested: 25%
Population: 1.54 million

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Rank: 13th
City: Fairfax County, Virginia
% Of Roads Congested: 26%
Population: 1.02 million

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Rank: 12th
City: Boston, Massachusetts
% Of Roads Congested: 27%
Population: 620,535

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Rank: 11th
City: Atlanta, Georgia
% Of Roads Congested: 27%
Population: 537,958

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Rank: 10th
City: Oakland, California
% Of Roads Congested: 28%
Population: 645,345

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Rank: 9th
City: Alexandria, Virginia
% Of Roads Congested: 28%
Population: 140,024

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Rank: 8th
City: San Jose, California
% Of Roads Congested: 29%
Population: 948,279

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Rank: 7th
City: Washington, D.C.
% Of Roads Congested: 30%
Population: 591,833

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Rank: 6th
City: New York, New York
% Of Roads Congested: 31%
Population: 8.37 million

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Rank: 5th
City: San Francisco, California
% Of Roads Congested: 35%
Population:

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Rank: 4th
City: Montgomery County, Maryland
% Of Roads Congested: 37%
Population: 808,976

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Rank: 3rd
City: Chicago, Illinois
% Of Roads Congested: 37%
Population: 2.85 million

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Rank: 2nd
City: Los Angeles, California
% Of Roads Congested: 38%
Population: 3.83 million

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Rank: 1st
City: Seattle, Washington
% Of Roads Congested: 43%
Population: 602,000

DISCUSSION

By
Deartháir

How do they calculate these populations? Is it just the downtown metropolitan area?

I'm curious, because Edmonton, for instance, has an accepted population of about a million, Calgary has a population of something like 1.2 million, and Vancouver is somewhere in the neighbourhood of 3 million; but when we calculate those numbers, we factor in all the little suburbs that have their own names, like "Sherwood Park" and "College Heights" or whatever. I'm assuming you don't? Because I have a hard time believing Edmonchuk is twice the size of Hotlanta.