Tex. Transportation Code § 394.081

(a) In lieu of being subject to a criminal penalty, a person who intentionally violates this chapter or a rule adopted by the commission under this chapter may be liable for a civil penalty of not less than $150 or more than $1,000 for each violation, depending on the seriousness of the violation and whether the person has previously violated this chapter. Each day a violation continues is a separate violation.

(b) The attorney general or a district or county attorney may sue to collect the civil penalty.

(c) A civil penalty collected under this section shall be deposited to the credit of the state highway fund if collected by the attorney general and to the credit of the county road and bridge fund if collected by a district or county attorney.

(d) Before a suit may be brought against a property owner for a violation of Section 394.021(c), the attorney general or the district or county attorney for the county in which the violation is alleged to have occurred shall give the person charged with the violation a written notice that:

(1) describes the violation and specific location of the sign found to be in violation;

(2) states the amount of the proposed penalty for the violation; and

(3) gives the owner 45 days from receipt of the notice to remove the sign and cure the violation to avoid the penalty unless the person was found guilty or liable by a court for violating this chapter within the preceding six months.