The road known as state route number five hundred seventy-one, running in an easterly and westerly direction, through Miami county only, shall be known as the “Robert E. Netzley Highway.”

The director of transportation may erect suitable markers along the highway indicating its name only if the department of transportation receives private contributions sufficient to pay all costs of manufacturing, erecting, and maintaining the markers. Any private money received by the department for the purposes of this section shall be deposited in the state treasury to the credit of the state highway operating fund or any other fund of the department as determined by the director. No public money shall be used to pay the costs associated with highway markers erected under this section.