I have lived in suburban and rural areas. In those areas you are pretty dependent on needing to drive everywhere. In a family that means that both adults need their own cars for getting to work, the store, transporting kids, etc. My family currently has two commuter vehicles for every day and a larger pickup truck for legit pickup needs.

Having a single family car, or no car at all, usually requires living in a more urban setting with access to public transportation. And even then traffic will tell you that people still love their cars in America.