About 250 million vehicles are in use in the United States. Around the world, there were about 806 million cars and light trucks on the road in 2007, consuming over 260 billion gallons of gasoline and diesel fuel yearly. In the opinion of some, urban transport systems based around the car have proved unsustainable, consuming excessive energy, affecting the health of populations, and delivering a declining level of service despite increasing investments. Many of these negative impacts fall disproportionately on those social groups who are also least likely to own and drive cars.

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