To answer your question, it is at the discretion of the commander.
The commander can say warn, charge-and-release, charge and arrest, arrest only, beat and mace mercilessly...
In my opinion, in this day and age of violent crime, you are not going to get a ticket or arrested for anything on a bike.
The prosecutors, courts, and cops, have bigger fish to fry.
My experience is that as long as you present some kind of ID that checks out (valid),
are reasonably respectful and penetant after a potential stop, you will git a talkin'-to.
EEven if you smash out the windshield of a moterrorist's mini-truck with a 33 oz. Zefal Magnum bottle full of water,
you will just get charged with destruction of private property and released; AS long as you don't give the cop any sh!t.
The theory behind all of this... (under U.S. Law), is, that; you have the right to decline to self-incriminate.
So, if there is no obvious reason to think that you have been operating a motor vehicle or are licensed tO operate one,
there is no reason to demand that a motor vehicle operator's license be presented,
no reason for you to present one and; no reason for you to be charged
with any violation of any provision of any motor vehicle operator's code of conduct.
So, carry around a type -written ID card that does not correspond to any motor vehicle operator's license issued in your name and,
with your name, CURRENT ADDRESS and valid phone # and offer it, only, as ID
at any bicycle traffic stop and be polite to any officer of the law.
Don't talk about driving.
Don't discuss whether or not you are licensed to operate unless you're ordered to.
If you're ordered to discuss it w/o the benefit of counsel, it's automatic dismissal.
I'm still Not Sure