Building a “smart city” takes four core ingredients. The first three: a strong culture of civic engagement, a deep pool of tech talent and the support of private and public institutions.

But unlike their counterparts abroad, American cities are still missing the fourth piece of the puzzle: the right infrastructure to optimize smart-city technologies.

In Philadelphia, Chicago and the Bay Area, Comcast is betting on the right infrastructure being Low-Power Wide-Area Networks (LPWAN).

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