I have to agree with what Denny said.
I got out of a speeding ticket,(car) just last year, but the judge asked to see my drivers license, before he released me. He told me he was checking to be sure I DID NOT HAVE a CDL, or I would not have gotten out of the automobile speeding ticket?
TRUE STORY.
I don't know anymore about the different license's than that, but just let me say, I do think if you drive a big bus, you need to have the proper training, and correct license to go along with it.
Gary S