By Hadas Kuznits

PHILADELPHIA (CBS) – Philadelphia ranks fourth in the country as cities where people do not own cars.

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According to a study by the University of Michigan Transportation Research Institute, nearly 33 percent of Philadelphians, like this woman, did not own cars in 2012: “Up until recently, I didn’t even have a car, because I could catch the bus everywhere!”

And the study indicates in Philadelphia and most other large cities, not owning a car is becoming a trend.

Reporter: “What are some of your favorite ways to get around town?”

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Man: “Bus, trolley sometimes, El, Broad Street subway, walking, too. That’s a healthy thing to do.”

A good public transportation system seemed to be a common theme among the top 5 most carless cities.

This woman thinks one reason might be, “I think a lot of people like public transportation because parking downtown is too expensive!”

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Walking was also an important factor. “We’re a good walking city, especially in Center City and we have a pretty good and expansive public transportation and I think people think it’s just cheaper and easier to catch the bus.”