(a) A road superintendent shall make the best contract possible for labor or machinery and in payment for the labor or machinery shall issue to the person entitled to payment a certificate showing the amount due and the purpose for which the certificate was given.
(b) The certificate shall be dated, numbered, and signed by the road superintendent.
(c) The road superintendent and the sureties on the road superintendent's official bond are liable for the damages caused by:
(1) the wrongful issuance of a certificate; or
(2) an extravagance in the amount of a certificate.
(d) On approval by the commissioners court, a warrant shall be issued to the person entitled to payment to be paid by the county treasurer out of the proper fund in the same manner as other warrants.