Finished 35 years later, one-quarter of all vehicle miles driven in the United States use the interstate system.

As would be expected, the most direct effect of the interstate was on other players in the transportation industry—rail in particular.

Passenger rail traffic fell by more than half in the years that followed and trucking went on to be the dominant form of freight, growing 40X to become four times the size of the railways.

Highways helped build the suburbs, in turn leading to the rise of the shopping mall and retailers like Walmart.

In business and in life, it is easy to foresee the first-order effect.

But it is much more difficult to think about the cascading consequences—both good and bad—that might come about as a result of that first change.

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