Mo. Rev. Stat. § 137.565
Whenever ten or more voters residing in or owners of land in any general or special road district in any county in this state shall petition the county commission of the county in which such district is located, asking that such commission submit the question in such district for the purpose of voting for or against the levy of the tax provided for in Section 12(a) of Article X of the Constitution of Missouri, it shall be the duty of the county commission, upon the filing of such petition, to submit the question. The petition so filed shall set out the duration of the tax to be levied in a period of one, two, three, or four years and the ballot to be used for voting shall specify the number of years duration of the tax levy, but in no event shall the duration of the tax levy be for a period of more than four years. Such submission shall be made by an order entered of record setting forth the date and the rate of tax the commission will levy, which rate shall not exceed thirty-five cents on the hundred dollars assessed valuation on all taxable real and tangible personal property in the district.
§ 137.565, RSMo