Tenn. Code § 54-2-104
Upon the receipt by the commissioner of transportation of any project estimate, account or other item of disbursement other than payroll payments, it shall be the duty of the commissioner to prepare a voucher-warrant for the amount for which the commissioner approves the account, project estimate or other disbursement, payable to the party entitled to the disbursement, and approved by the commissioner. The voucher-warrant shall be transmitted to the commissioner of finance and administration, together with the statement of account, estimate or other disbursement the commissioner may require, and when the voucher-warrant has been approved by the commissioner of finance and administration in accordance with law, the commissioner of finance and administration shall sign the voucher-warrant and shall deliver the voucher-warrant to the department of transportation for transmission to the party entitled to the voucher-warrant. When made out by the commissioner of transportation, the voucher-warrant shall contain the project number for which it is drawn and other memoranda or data the commissioner of transportation may deem requisite for purposes of identification and record. Upon presentation of the voucher-warrant, when properly signed by the commissioner of finance and administration and the commissioner of transportation, it shall be the duty of the state treasurer to pay the voucher-warrant.
T.C.A. § 54-2-104