Mo. Rev. Stat. § 227.416: John Playter Memorial Highway designated for a portion of Highway 13 in Polk County.

The portion of Highway 13 from the intersection of Highway 32 to the intersection of Highway 83 in Polk County shall be designated the "John Playter Memorial Highway". The department of transportation shall erect and maintain appropriate signs designating such highway, with the costs for such designation to be paid for by private donation.