An automobile is a wheeled passenger vehicle that carries its own motor. Most definitions of the term specify that automobiles are designed to run primarily on roads, to have seating for one to six people, typically have four wheels and be constructed principally for the transport of people rather than goods. However, the term is far from precise.

As of 2002 there were 590 million passenger cars worldwide (roughly one car for every eleven people), of which 140 million in the U.S. (roughly one car for every two people) [1]...

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