Drivers stuck in traffic in Mexico City lately have found themselves being buzzed by a fleet of sign-toting drones. "Driving by yourself?" some scolded in Spanish. "This is why you can never see the volcanoes" -- a reference to the smog that often hovers over the mega-city and obscures two nearby peaks.
It wasn't exactly a plea for environmentalism, though -- it was an ad for UberPOOL, part of Uber's big push into markets across Latin America.
Uber's Ad-Toting Drones Are Heckling Drivers Stuck in Traffic