Any person operating any vehicle transporting explosives upon a highway shall at all times comply with the following requirements:
(a) The vehicle shall be marked or placarded on each side and on the rear with the word “EXPLOSIVES” in letters not less than eight inches high, or there shall be displayed on the rear of such vehicle a red flag not less than 24 inches square marked with the word “DANGER” in white letters six inches high, or shall be marked or placarded in accordance with Section 177.823 of the United States Department of Transportation regulations.
(b) The vehicle shall be equipped with not less than two fire extinguishers, filled and ready for immediate use, and placed at convenient points on such vehicle.
(ORC 4513.29(A), (B))