Texas Transportation Code Sec. § 451.601 Unit of Election Defined In this subchapter, “unit of election” means: (1) a municipality, including a principal municipality; (2) an unincorporated area designated by a commissioners court under Section 451.657 (Commissioners Court to Designate Election Areas) as a discrete unit for the purposes of a confirmation election; or (3) an emergency services district operating under Chapter 775 (Emergency Services Districts), Health and Safety Code, that: (A) borders Lake Travis; and (B) is located in or borders two municipalities with a population of more than 45,000. Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995. Amended by: Acts 2015, 84th Leg., R.S., Ch. 876 (H.B. 3666), Sec. 1, eff. September 1, 2015.