That portion of the road known as state route number seventy-two running in a north and south direction, commencing at the intersection of state route number seventy-two and interstate number seventy in Clark county and extending northward to the boundary of Clark county and Champaign county including that portion of South Limestone street running in front of the former Springfield high school, shall be known as the “Governor James A. Rhodes Memorial Highway.” This designation is in addition to the designation in section 5533.23 of the Revised Code.

The director of transportation may erect suitable markers along the highway indicating its name.