Makes sense in an urban setting as car gridlock limits the size amount of density in a city, not many cities are built like Chicago either with it underground roads.
And the past few years if I had, had to pay for a car and rent it wouldn't have worked.
http://www.fhwa.dot.gov/planning/census_issues/metropolitan_plannin...
Nearly 80% of the U.S. population lives in "Urban areas"
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