Ohio Rev. Code § 5533.31: Christopher Columbus Highway.

The road known as interstate route eighty, extending across Ohio from the Pennsylvania border in Trumbull county to the Indiana border in Williams county, shall be known as the "Christopher Columbus highway."

The director of transportation may erect suitable markers upon the portions of such highway under the director's jurisdiction indicating its name, and the Ohio turnpike and infrastructure commission may erect suitable markers on the portions of such highway under its jurisdiction indicating its name.