NATURE OF AUTHORITY.
Tex. TRANSP Code § 451.052.
in effect(a) An authority:
(1) is a public political entity and corporate body;
(2) has perpetual succession; and
(3) exercises public and essential governmental functions.
(b) The exercise of a power granted by this chapter, including a power relating to a station or terminal complex, is for a public purpose and is a matter of public necessity.
(c) An authority is a governmental unit under Chapter 101 , Civil Practice and Remedies Code, and the operations of the authority are not proprietary functions for any purpose, including the application of Chapter 101 , Civil Practice and Remedies Code.