On an eight-mile stretch of Interstate 15 ten miles north of San Diego, traffic engineers are installing an MIT-designed system which will introduce the "automated driver."The

在圣迭戈以北10英里的15号州际公路一段8英里长的路面上，交通工程是正在安装一个由麻省理工学院设计的引进“自动司机”的系统。

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But the past ten years have seen another source of growth, as interstate highways have become clogged in places and have shown the effects of a lack of investment.

ECONOMIST: American railways