As used in this article, the term:

(1) “Intergovernmental agreement” means a contract entered into pursuant to Article IX, Section III, Paragraph I of the Constitution.

(2) “Mass transportation” means any mode of transportation serving the general public which is appropriate to transport people by highways or rail.

(3) “Qualified municipality” means a qualified municipality as defined in paragraph (4) of Code Section 48-8-110 which is located wholly or partly within a special district.

(4) “Transportation purposes” means and includes:

(A) Roads, bridges, public transit, rails, airports, buses, seaports, including without limitation road, street, and bridge purposes pursuant to paragraph (1) of subsection (b) of Code Section 48-8-121, and all accompanying infrastructure and services necessary to provide access to these transportation facilities, including new general obligation debt and other multiyear obligations issued to finance such purposes;

(B) The retirement of previously incurred general obligation debt with respect only to such purposes as identified in subparagraph (A) of this paragraph;

(C) A capital outlay project or projects under subparagraph (a)(1)(M) of Code Section 48-8-111, with respect only to such purposes as identified in subparagraph (A) of this paragraph; or

(D) Any combination of two or more of the foregoing.