And I'll say that I don't think it's reasonable to demand that a grown adult, *especially* with access to a cell phone and driving in a reasonably well populated area call to tell you they got home safely.
If you want to grant that to your parents, I'm not going to challenge you on it (but I'm going to roll my eyes inside a little bit). Fine, whatever works for you.
But I flat-out refuse to do it.
If people run into trouble that you can help them with, they will call. If they run into trouble that you -can't- help them with, you'll find out about it eventually. Your hearing from them isn't going to change reality. And you are in charge of your fears. It's not fair to demand that from someone else.
My DH and I had our first married fight about whether he would call his parents to tell them we landed safely in England for the honeymoon. I maintained, if there wasn't any news about plane crashes, they could reasonably assume we were safe. I wasn't a child, I wasn't going to call to tell someone I was safe when I clearly was.
The final upshot of that fight was, he could call, but he needed to make sure he never, ever mentioned it to me. I wasn't going to be a party to it.
I will sometimes call simply because it's the last contact of a valued time together. I admit to wondering if my friend who visited from out of town was home and settled yet. But it wasn't because I was worried. It's more a notification, "OK, the visit is now officially over, because I'm/you're back home."