Tex. Transp. Code § 285.001
(a) To promote the public safety, the commissioners court of a county with a population of more than 1.3 million by order may regulate the following in the unincorporated area of the county if they occur on a public highway or road, in the right-of-way of a public highway or road, or in a parking lot:
(b) The commissioners court of a county with a population of more than 870,000 that borders the United Mexican States by order may regulate the activities described by Subsection (a) in the manner described by that subsection, except that:
Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.
Amended by Acts 2001, 77th Leg., ch. 669, Sec. 132, eff. Sept. 1, 2001.
Acts 2007, 80th Leg., R.S., Ch. 493 (S.B. 254), Sec. 1, eff. September 1, 2007.
Acts 2013, 83rd Leg., R.S., Ch. 340 (H.B. 2094), Sec. 1, eff. June 14, 2013.
Acts 2023, 88th Leg., R.S., Ch. 644 (H.B. 4559), Sec. 243, eff. September 1, 2023.