Ohio Rev. Code § 5533.07: Forty-second Rainbow Division Memorial Highway.

The road known as state route number forty-two, running in a northeasterly and southwesterly direction across the state through the counties of Cuyahoga, Medina, Wayne, Ashland, Richland, Morrow, Delaware, Union, Madison, Clark, Greene, Warren, Butler, and Hamilton and through the municipal corporations of Cleveland, Medina, Ashland, Mansfield, Mt. Gilead, Delaware, London, Xenia, Lebanon, and Cincinnati shall be known as the "Forty-second 'Rainbow' Division Memorial Highway."

The director of transportation may erect suitable markers upon said highway indicating its name.