Over the past 50 years, automobiles have continued to be our “freedom machines,” a means of both transportation and personal expression. Even so, as the industry recognized, the automobile is but one element of a mobility system—an element governed by extensive regulations, constrained by a need for fuel, and dependent on a network of roadways and parking spaces. Automobiles are also a force for change. Over the past half century, their very success has generated pollution and congestion while straining the supply of global resources. The rapid surge of emerging markets, particularly China, has heightened these dynamics.

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