Traffic will flow through high-speed underground roadways and aboveground interchanges.

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For one thing, this kind of high-speed innovation seems to require a near-addiction to a rapid flow of data that everyone can agree on, with a good feedback loop to test ideas.

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High-speed rail holds vast promise, from easing congestion (and speeding the flow of goods and services) to reducing carbon emissions.

ECONOMIST: America��s trains may soon go faster��relatively