Personal transportation is dominated by cars, which run on a network of 13 million road, including one of the world's longest highway system. The second largest automobile market in the world. States with the highest rates of car ownership per head of the world, with up to 765 cars per 1,000 Americans, about 40% of personal vehicles are vans, SUVs or light trucks. The average American adult (including all of the drivers and those who do not drive), spent 55 minutes driving every day, traveling 29 miles.
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