In this chapter, the following terms have the meanings indicated. Terms Defined. “Administration” means the Motor Vehicle Administration. “Class A self-insurer” means: A person or business, except taxicab operations, leasing or rental companies, and governmental entities; or An interstate trucking company in whose name less than 26 vehicles are registered as owner or lessee in this State, but which has a fleet of 26 or more registered vehicles. “Class B self-insurer” means a Maryland taxicab company. “Class C self-insurer” means: A public utility; A quasigovernmental agency, including a public entity as defined in Article 48A, §482B(a), Annotated Code of Maryland; or A local government. “Class D self-insurer” means a person in the business of leasing or renting vehicles. “Temporary substitute vehicle” means a vehicle acquired to temporarily replace a vehicle which is out of service.