N.C. Gen. Stat. § 160A-617
In addition to the powers granted by this Article, the Authority may issue bonds and notes pursuant to the provisions of the Local Government Bond Act and the Local Government Revenue Bond Act for the purpose of financing public transportation systems or any part thereof and to refund such bonds and notes, whether or not in advance of their maturity or earliest redemption date. Any bond order must be approved by resolution adopted by the special tax board of the Authority and in the case of a bond order under the Local Government Bond Act also by the board of county commissioners of each county organizing the authority. To pay any bond or note issued under the Local Government Bond Act, the Authority may not pledge the levy of any ad valorem tax, but only a tax or taxes it is authorized to levy.
N.C. Gen. Stat. § 160A-617