In the century since the Ford Model T was introduced in 1908, global vehicle numbers have swollen to well over a billion. But according to recent research, the growth may have stopped.

　　According

　　to

　　Professor

　　Michael

　　Sivak,

　　at

　　the

　　University

　　of

　　Michigan, “motorization” in the US might have reached a peak in 2008, and that the figures have been on the decline since.

　　“New York, Washington, Boston, Philadelphia, each have more than thirty percent of households without a light duty vehicle，” says Sivak. In fact, the figures show that fifty­six percent of households in New York (which top the list) don't have a car. “I think that will be surprising to most people. It was surprising to me, and I am in the business.”

　　Sivak thinks a number of factors could be contributing to the trend, including working from home and the movement of populations back to city centers. In China, Beijing and Shanghai are looking at plans to limit the number of new vehicles being registered to control growth. It's a movement more cities are looking towards, particularly in the US.

　　21．Why does Hamburg launch the “car­free” program?

　　A. To build a greener environment.

　　B. To fix a worldwide road network.

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