There is a system that does not auto-bill in Europe but solves your issue: there are apps in which you tag with your location and license plate information. You pay within the app and you can even “top up” from within some apps as well.

The only downside, as you would expect, is that you have a new app or two for every city you travel to. It works pretty well though, and it’s way better than having to hunt down a kiosk.

I’m actually pretty surprised that kind of thing hasn’t caught on more here. I’m sure there are at least a few cities in the USA that do it.