The real story is that Norway is dropping analog FM broadcasting in favor of the European digital radio broadcasting standard DAB. Cars already come equipped with DAB receivers, and Norway already simulcasts in DAB and FM.
The US equivalent is called HD Radio, and is simulcast along with may AM and FM stations, but our cars don’t have HD Radio receivers yet. You have to buy a separate receiver.
When you say "our cars", do you mean "US cars"? Or do you mean your personal vehicles?
My wife's car (a 2013 Toyota) has an HD radio. My car (a 2014 Honda) may have it, but I always listen to XM Radio, not local broadcast.
Just so nobody reads something into the name that isn't there, "HD Radio" isn't "High Definition Radio". They just want you to think that's the case.
Actually in this context, "HD" has no meaning at all other than as a trade name.