(A) No person shall operate or cause to be operated upon a public road or highway a motor vehicle of a manufacturer or dealer unless the vehicle carries and displays two placards, except as pro-vided ln R.C. § 4503.21, issued by the Director of Public Safety that bear the registration number of its manufacturer or dealer.
(B) Whoever violates division (A) of this section is guilty of illegal operation of a manufacturers or dealers motor vehicle, a minor misdemeanor on a first offense and a misdemeanor of the fourth degree on each subsequent offense.
(R.C. § 4549.10) ('81 Code § 73.29)