LUXEMBOURG'S roads are jammed with 647 cars for every 1,000 people, the highest ownership rate in the world. The tiny country is rich, which probably accounts for its motor-mania. Car ownership is also high in wealthy countries with remote rural populations, such as Iceland and New Zealand. Surprisingly, America, home of the motor vehicle, has fewer cars per person than either Australia or Canada.

http://www.economist.com/daily/chartgaller...e=features_box4

 

with all the cars that I see everyday, it's amazing to see that US is not #1.