Man, guess same way as commercial vs. personal licenses, & car vs. motorcycle (Class C vs. Class M) licenses? So only applies to people who get pulled over for doing something dangerous I guess.

This answer is pretty much “honor system”.

Those stupid, non-privacy-respecting (dangerous), incredibly expensive digital plates recently approved in California - they could display the driver’s license class. Then a cop behind you could tell when you’re not allowed to be pulling that U Turn at the narrow intersection that’s restricted to a class above you.

I guess an advantage is if somebody hit you, you’d have a chance to go after them for a class-violating move. But you also might get frustrated not knowing whether somebody in front of you could be making a right on red or something.