(1) Authority. - Any of the following:
a. A public transportation authority created pursuant to Article 25 of Chapter 160A of the General Statutes that includes two or more counties.
b. A regional public transportation authority created pursuant to Article 26 of Chapter 160A of the General Statutes.
c. A regional transportation authority created pursuant to Article 27 of Chapter 160A of the General Statutes.
(2) Board of trustees. - The governing body of an Authority.
(3) Public transportation system. - Defined in G.S. 105-550.