Transportation Code §256.004

(a) The commissioners court of a county shall credit taxes collected under Section 256.054 to the credit of separate funds called the farm-to-market and lateral road fund and the flood control fund. (b) If the voters at an election held under Section 256.054 approved separately a farm-to-market and lateral road tax and a flood control tax, the court shall credit the taxes collected to those funds in proportion to the allocation adopted at the election.