(a) The territory of a part of a county that is not a part of an authority and that is designated by the commissioners court of the county may be added to an authority if:
(1) any part of the county is located in the authority or any part of an adjacent county is located in the authority;
(2) the commissioners court orders an election in the designated area under this section on whether the area should be added to the authority; and
(3) a majority of the votes received in the election favor the measure.
(b) In designating an area under this section, the commissioners court may not, to the extent practicable, divide a county election precinct.
(c) The commissioners court shall certify to the authority the result of an election in which the addition is approved.
Official text of the Texas Transportation Code as published by the Texas Legislative Council.