I have friends who live back east in big cities. (Philly and NYC). They do car shares because the cost of owning the car is too high – parking being a big factor. For the 2-3 times a week they need a car, they use the carshare. They all take public transit to work or work from home.
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I lived in DC and Chicago for a total of about five years and didn’t have a car. I just rented one when I needed one and otherwise used cabs, the El and the Metro. It was great. Can’t do that here, however.