I was initially preoocupied with the relationship between the two people in this vehicle. I thought it might make more sense to establish them as grandfather and granddaughter, or even an old retiree and a young hitchhiker.
I wrote the joke out in various ways and decided the ambiguity wasn’t a problem. You’re going to assume it’s a husband and wife and that’s just fine. He just happens to be a bit of a luddite and she’s a bit of a technophile.
I also fought with the art on this one, because I wrote it picturing them on the open highway, and this art kind of makes them look parked. Another detail ultimately shrugged off.