The company that makes Tom Tom global positioning system – or GPS – navigation devices says it’s getting some of the most complete and up-to-date information ever on roads in the U.S.

And now, it’s ranking them.

“There’s some surprises,” says Margot Dologne, a spokeswoman for TeleAtlas, a digital map company and subsidiary of Tom Tom. “I mean, you would never think Seattle would be the most congested city in the continental United States, or for that matter Minneapolis -St Paul would be down at the number 30 spot.”

The company ranked 30 metropolitan areas in the US with populations over half a million.

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