As used in this chapter, the following words and terms shall have the following meanings, unless the context shall indicate another or different meaning or intent:
Any obligation or expense incurred by the department for surveys, borings, preparation of plans and specifications, and other engineering services in connection with the construction of a project under this chapter or for the repayment of a grant from a federal agency which the authority itself would be authorized to repay under section 5(9) of this chapter in connection with such project or with the issuance of bonds for the payment of the cost of such project, shall be regarded as a part of the cost of such project and shall be reimbursed to the state out of the proceeds of toll road revenue bonds as authorized.
IC 8-15-2-4