N.Y. Comp. Codes R. & Regs. tit. 15 § 3.1
Chapters 173 and 696 of the Laws of 1990 amended various provisions of the Vehicle and Traffic Law relating to driver licensing effective February 19, 1991. Those chapters provide that the holder of any previously issued license or permit to drive in existence on February 19, 1991 shall continue to have all of the rights granted by such license or permit at the time of its issuance until the expiration of that license or permit except that no such license or permit will be valid for the operation of a commercial motor vehicle on and after April 1, 1992. Those chapters also established a new classification system for driver licenses and provided for endorsements and restrictions which may be added to such licenses. This part is intended to implement the provisions of those chapters. The provisions of this part that are applicable to an applicant for or the holder of a commercial driver's license shall also be applicable to an applicant for or the holder of a commercial learner's permit, except for those provisions which by their nature can have no application.
N.Y. Comp. Codes R. & Regs. Tit. 15 § 3.1