Any county in this state which has heretofore adopted or may hereafter adopt the county road unit system may at any general election after two years from the date of such adoption abandon the county road unit system and return to the original county and township road system prevailing in the county before the adoption of the county road unit system: Provided, That every outstanding contract made by such county while operating under the provision of the county road unit system be fully satisfied and complied with.
K.S.A. 68-517