(a) Except as otherwise provided by this subchapter, this chapter may not be construed to reduce, limit, or impair the authority provided by law to any city.
(b) Except as provided by Subsection (c) of this section, a city may not adopt or enforce an ordinance that establishes safety standards or practices applicable to the pipeline transportation of hazardous liquids or carbon dioxide or hazardous liquid or carbon dioxide pipeline facilities that are subject to regulation by federal or state law.

(c) A city may adopt ordinances that establish conditions for installing or relocating pipelines over, under, along, or across public streets and alleys within the boundaries of the city.