Maryland Code, Transportation § 16-104.1

(a)(1) A noncommercial Class A driver's license authorizes the licensee to drive combinations of Class F (tractor) and Class G (trailer) vehicles and any vehicle that a noncommercial Class B driver's license authorizes its holder to drive, except:

(2) An individual who is issued a noncommercial Class A driver's license under this subsection may not drive or attempt to drive a motor vehicle on any highway in this State unless a noncommercial Class A driver's license authorizes the individual to drive a vehicle of the class that the individual is driving or attempting to drive.

(b)(1) A noncommercial Class B driver's license authorizes the licensee to drive any single vehicle or combinations of vehicles with a gross vehicle weight rating (GVWR) or gross combination weight rating (GCWR), as defined in § 16-803 of this title, of 26,001 pounds and more and any vehicle that a noncommercial Class C driver's license authorizes its holder to drive, except:

(2) An individual who is issued a noncommercial Class B driver's license under this subsection may not drive or attempt to drive a motor vehicle on any highway in this State unless a noncommercial Class B driver's license authorizes the individual to drive a vehicle of the class that the individual is driving or attempting to drive.

(c)(1) A noncommercial Class C driver's license authorizes the licensee to drive any vehicle or combination of vehicles with a gross vehicle weight rating (GVWR), as defined in § 16-803 of this title, of less than 26,001 pounds, except:

(2) An individual who is issued a noncommercial Class C driver's license under this subsection may not drive or attempt to drive a motor vehicle on any highway in this State unless a noncommercial Class C driver's license authorizes the individual to drive a vehicle of the class that the individual is driving or attempting to drive.

(d)(1) A Class M driver's license authorizes the licensee to drive motorcycles other than autocycles.

(2) An individual who is issued a Class M driver's license under this subsection may not drive or attempt to drive a motor vehicle on any highway in this State unless a Class M driver's license authorizes the individual to drive a vehicle of the class that the individual is driving or attempting to drive.

(e)(1) This subsection does not apply to an autocycle or when the towing vehicle is a commercial motor vehicle.

(2) Subject to the provisions of this section, a noncommercial Class A, B, or C license holder may: