Guerrilla Marketers Use Mobile Billboards for Surprise Ad Attacks

In a world where everything is mobile, even billboards are starting to move in surprising ways. Large advertising messages traditionally fixed to sides of buildings or planted along roadways are being freed by digital projectors and laptop computers to pop up in unexpected places.

"This is a form of advertising that's working, and we're telling cities they can regulate it and get a revenue stream," Ewen said. "And if not, we'll continue to do it anyway."