N.C. Gen. Stat. § 160A-608
The purpose of the Authority shall be to finance, provide, operate, and maintain for a safe, clean, reliable, adequate, convenient, energy efficient, economically and environmentally sound public transportation system for the service area of the Authority through the granting of franchises, ownership and leasing of terminals, buses and other transportation facilities and equipment, and otherwise through the exercise of the powers and duties conferred upon it, in order to enhance mobility in the region and encourage sound growth patterns.
Such a service, facility, or function shall be financed, provided, operated, or maintained in the service area of the Authority either in addition to or to a greater or lesser extent than services, facilities, or functions are financed, provided, operated, or maintained for the entirety of the respective units of local government.
N.C. Gen. Stat. § 160A-608