SDCL § 31-5-11: Improvements to trunk system--Payments upon estimates approved by department--Vouchers.

Payments from all funds made available for road and bridge construction contracts for the trunk highway system shall be made from time to time by the state treasurer upon estimates approved by the department. Upon partial payments made upon signed contracts, the approval of the department on such partial payment vouchers is sufficient proof of correctness, and the oath of the payee is not required in this case.