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Also interesting that the PATH, which serves parts of Manhattan (and I feel not a lot of people know about), ranks 7th on the list.

It's more a New Jersey thing than a New York thing even though technically it goes to Manhattan.

That's some pretty impressive volume considering it's not all that expansive: http://www.panynj.gov/path/maps.html

Anyone who doesn't work, live, or play in New Jersey wouldn't know about PATH because otherwise it's trivia.