There is appropriated out of the moneys of the treasury, to the credit of the motor carrier fund, the sum of $50,000.00 annually, to meet the expense incurred by the Alabama Public Service Commission under the provisions of this chapter. The expenses incurred by the Alabama Public Service Commission under the provisions of this chapter, when certified by the commission or its president and approved by the Governor, shall be paid on warrant drawn as prescribed by law with respect to warrants.