Mo. Rev. Stat. § 233.470

Sections 233.450 to 233.465 shall not apply to any township, the whole or any part of which is included in a special road district that has issued bonds, the whole or any part of which are outstanding and unpaid; nor shall said sections apply to any special road district which includes the whole or any part of any township which has issued bonds for road purposes, the whole or any part of which bonds are outstanding and unpaid, nor shall said sections apply to any special road district which includes the whole or any part of the territory of any other special road district which has incurred an indebtedness evidenced by an issue of bonds, the whole or any part of which are outstanding and unpaid.