TomTom Maps the 20 Most Traffic-Congested Cities

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If you sit in traffic frequently during your commute, it’s aggravating enough that you probably don’t care where your city ranks among traffic-congested cities. If you do care, though, then TomTom has compiled a list of sophisticated data to pinpoint the 20 most traffic-burdened cities.

By aggregating speed data from its in-car navigation systems, TomTom can tell which urban areas have the heaviest, slowest-moving traffic. The GPS data from its Tele Atlas business system creates a map of drivers moving at 70% or less than the posted speed limit.

The surprising winner is Seattle, which had 43% of its roads congested. Rounding out the top five are Los Angeles, Chicago (where we have to drive), Montgomery County, Md., and San Francisco.

Check out Jalopnik’s complete gallery to see your city in all its congested glory.

TomTom’s 20 Most Traffic Congested Cities (Jalopnik)