The terms and provisions of this act shall be considered and construed to be in addition and supplemental to the terms and provisions of Kan. Stat. Ann. §§ 68-2001 to 68-2020, inclusive and amendments there, and shall not be construed as amendatory thereto, but all contracts entered into by the secretary of transportation and the Kansas turnpike authority after this act takes effect which relate to the services described in Kan. Stat. Ann. §§ 68-2021 and 68-2022, shall be governed solely by the provisions of this act.