I know there are several regular here who are very car light while living in a family with one automobile. I've almost always had that arrangement, but find it works especially well with me using a bicycle for my personal travel and other family members being pretty light on car travel.

How does it work for you?
Is it a solutions for heavy traffic congestion?
Why is it that North Americans have pretty much abandoned it as a standard for families and gone to the one driver/one car model?