Texas Transportation Code - TRANSP § 524.023. Application of Suspension Under Other Laws

(a) If a person is convicted of an offense under Section 106.041, Alcoholic Beverage Code, or Section 49.04, 49.045, 49.06, 49.061,49.07, or 49.08, Penal Code, and if any conduct on which that conviction is based is a ground for a driver's license suspension under this chapter and Section 106.041, Alcoholic Beverage Code, Subchapter O, Chapter 521,  1 or Subchapter H, Chapter 522,  2 each of the suspensions shall be imposed.

(b) The court imposing a driver's license suspension under Section 106.041, Alcoholic Beverage Code, or Chapter 521 or 522 as required by Subsection (a) shall credit a period of suspension imposed under this chapter toward the period of suspension required under Section 106.041, Alcoholic Beverage Code, or Subchapter O, Chapter 521, or Subchapter H, Chapter 522, unless the person was convicted of an offense under Article 6701l-1, Revised Statutes, as that law existed before September 1, 1994, Section 19.05(a)(2), Penal Code, as that law existed before September 1, 1994, Section 49.04, 49.045, 49.06, 49.061,49.07, or 49.08, Penal Code, or Section 106.041, Alcoholic Beverage Code, before the date of the conviction on which the suspension is based, in which event credit may not be given.