(a) The commissioners court of a county that has a population greater than 1.3 million and in which a municipality with a population of more than one million is primarily located may impose by order an additional fee of not less than 50 cents or more than $1.50 for a vehicle registered in the county. The commissioners court of any other county may impose by order an additional fee of not more than $1.50 for registering a vehicle in the county.
(b) A vehicle that may be registered under this chapter without payment of a registration fee may be registered without payment of the additional fee.

(c) A fee imposed under this section may take effect and be removed in accordance with the provisions of § 502.401.
(d) The additional fee shall be collected for a vehicle when other fees imposed under this chapter are collected.
(e) A county imposing a fee under this section may deduct for administrative costs an amount of not more than 10 percent of the revenue it receives from the fee. The county may also deduct from the fee revenue an amount proportional to the percentage of county residents who live in unincorporated areas of the county. After making the deductions provided for by this subsection, the county shall send the remainder of the fee revenue to the municipalities in the county according to their population.
(f) A municipality with a population greater than 1.3 million shall deposit revenue from a fee imposed under this subsection to the credit of the child safety trust fund created under § 106.001, Local Government Code. A municipality with a population less than 1.3 million shall use revenue from a fee imposed under this section in accordance with Article 102.014(g), Code of Criminal Procedure.
(g) After deducting administrative costs, a county may use revenue from a fee imposed under this section only for a purpose permitted by Article 102.014(g), Code of Criminal Procedure.