Mo. Rev. Stat. § 227.514: Harriett Woods Memorial Highway designated for a portion of Interstate 170.

The stretch of Interstate 170, from its intersection with Interstate 270 on the North to its intersection with Delmar Boulevard on the South, shall be designated the "Harriett Woods 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.