People seem to be ignoring the fact that text ads are possible over the radio. A lot of local stations are not starting to pipe the name of the song/artist in addition to just the name of the radio, this gets displayed on the head unit of the car. As new cars start getting nicer head units with larger LED displays, what stops Google from using this space as a text ad? When people look down to see the name of the song, they get exposed to the name of a local pizza parlor. "Ah! Pizza! What a great idea! I want some now"