Uh-oh. This isn’t good news for radio in the car.

AM radio has been enjoyed in cars since the early 1930s. FM radio (such as it was back then) first appeared in car radios in the early 1950s. Since then, the car has been radio’s best friend, the place where most listening happens using traditional over-the-air technology from powerful transmitters.

But times are changing as more and more people access audio and video via internet protocol (IP), which is to say, streaming. Infotainment systems are becoming more sophisticated and programmed in that direction.

Edison Research has been tracking listening habits in the car. Listening to audio via an AM/FM radio has been trending down for Americans aged 13-34 for a decade, while listening on mobile devices has been going up. This year, the two sources swapped places.

The above graph shows percentage of time spent between the two listening media. Again, this is American radio consumption vs. mobile devices.