" Now the nation’s largest billboard company, Clear Channel Outdoor Inc., is bringing customized pop-up ads to the interstate. Its Radar program, up and running in Boston and 10 other US cities, uses data AT&T Inc. collects on 130 million cellular subscribers, and from two other companies, PlaceIQ Inc. and Placed Inc., which use phone apps to track the comings and goings of millions more. Clear Channel knows what kinds of people are driving past one of their billboards at 6:30 p.m. on a Friday—how many are Dunkin’ Donuts regulars, for example, or have been to three Red Sox games so far this year. It can then precisely target ads to them. "
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