Maryland Transportation Section 16-104

      (a)      (1)      A Class A driver's license authorizes the licensee to drive:

                  (i)      Combinations of Class F (tractor) and Class G (trailer) vehicles; and

                  (ii)      Any vehicle that a Class B, C, or D driver's license authorizes its holder to drive.

            (2)      An individual who is issued a 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 Class A driver's license authorizes the individual to drive a vehicle of the class that individual is driving or attempting to drive.

      (b)      (1)      A Class B driver's license authorizes the licensee to drive:

                  (i)      Vehicles or combinations of vehicles with a registered gross vehicle weight or registered gross combination weight of more than 25,000 pounds, excluding combinations of Class F (tractor) and Class G (trailer) vehicles; and

                  (ii)      Except as provided in § 16-103(c) of this subtitle, any vehicle that a Class C or D driver's license authorizes its holder to drive.

            (2)      An individual who is issued a 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 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 Class C driver's license authorizes the licensee to drive:

                  (i)      Buses; and

                  (ii)      Any vehicle that a Class D driver's license authorizes its holder to drive.

            (2)      An individual who is issued a 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 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 D driver's license authorizes the licensee to drive any vehicle or combinations of vehicles, except:

                  (i)      Combinations of Class F (tractor) and Class G (trailer) vehicles;

                  (ii)      Vehicles or combinations of vehicles with a registered gross vehicle weight or registered gross combination weight of more than 25,000 pounds, but not including an uncoupled truck tractor;

                  (iii)      Buses over 10,000 pounds gross vehicle weight; and

                  (iv)      Motorcycles.

            (2)      An individual who is issued a Class D 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 D driver's license authorizes the individual to drive a vehicle of the class that the individual is driving or attempting to drive.

      (e)      (1)      A Class E driver's license authorizes the licensee to drive motorcycles.

            (2)      An individual who is issued a Class E 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 E driver's license authorizes the individual to drive a vehicle of the class that the individual is driving or attempting to drive.

      (f)      Subject to the provisions of the Maryland Vehicle Law, a Class A, B, C, or D licensee may:

            (1)      Drive any tow truck, as defined in and registered in accordance with § 13-920 of this article, designed and used only for towing vehicles; and

            (2)      Tow any vehicle with that tow truck.

      (g)      This section applies to any license issued or renewed on or before December 31, 1989.