Unless you are making lots and lots of trips, usually using taxis works out to be cheaper than owning a car, for in-town errands. Also you don't have to buy it and eat depreciation. I know several people who are car-free here, and a couple with kids here in my city, which covers the same area as Columbus but only has 200 000 people. They use a combination of bikes, taxis and buses, and our winter is fairly severe.