One thing that isn’t mentioned in the article is that driver’s education in US is a fucking sad joke, and the driving tests even more so.
Many mention rules about yielding, and having to stop when turning right on red: most of the drivers only know a fraction of the rules. They never learned most of them.
I’m not sure about this, but my understanding is that some states don’t even require a license if you are older.
The whole sticking-it-to-the-back-of-your-phone i find a bit useless, but mine came with two metal rings so that I can stick it to other places.
I have one ring on the dashboard of my car so the X4 can hang there until i need to use it. Good for trips with many stops.